your cutting tool solution for taps - nachi america...0.689 0.874 1.000 1.126 1.252 1.425 1.669...
TRANSCRIPT
Your Cutting Tool Solution for
TAPS
List 6956 Metric Sizes
List 6957List 6955
DLC TAFLET TAP THREAD FORMING P13, 14p13
List 6959List 6958
SG LO TAP SPIRAL FLUTEDP10, 11p10
HIGH PERFORMANCE TAPS
1
TAPS / VISUAL INDEX
FAX 45ΒΊList 6800 Metric Sizes
SGSP-DIN TAP SPIRAL FLUTED
List 6801 Machine Screw and Fractional Sizes
P6, 7p6
Specs/SizesSpeeds/Feeds
List 996
P15p
VIPER TAFLET
VIPER TAFLET FOR STEEL
List 995 Fractional Sizes P16, 17pList 995 Machine Screw Sizes
Metric Sizes
Specs/SizesSpeeds/Feeds
FAXList 6802 Metric Sizes
SGPO-DIN TAP SPIRAL POINTED
List 6803 Fractional and Machine Screw Sizes
P8, 9p8
Metric SizesFractional and Machine Screw Sizes
Fractional Sizes
Machine Screw Sizes
NEW
NEW
List 981
VTP TAPS
List 983 Machine
Screw Sizes
P20p21
Fractional Sizes
2
TAPS / VISUAL INDEX
List 973 Machine Screw Sizes
P21p21
List 971 Fractional Sizes
List 980
VTP TAP SPIRAL FLUTED
P19p21
List 982
VTP TAP SPIRAL POINTED
P19p21
Specs/SizesSpeeds/Feeds
List 7980
VIPER T SERIES SPIRAL FLUTED P22p27
VIPER T SERIES SPIRAL POINTED
VIPER T-SERIES
P23p27
List 7970List 7971
Specs/SizesSpeeds/Feeds
Metric Sizes
Metric Sizes
Metric Sizes
List 7981 Fractional and Machine Screw Sizes
Metric Sizes
Fractional and Machine Screw Sizes
P22p27
P24p27
VIPER T TAP SERIES SPIRAL FLUTED
List 7982
Metric Sizes
P25p27
List 7972 Metric Sizes
P25p27
List 7977P27p27
VIPER T TAP SERIES SPIRAL POINTED
P26p27List 7987 Fractional and Machine Screw Sizes
Fractional and Machine Screw Sizes
General Purpose
General Purpose
*Series being DISCONTINUED, See VTP Series for replacement
*Series being DISCONTINUED, See VTP Series for replacement
*Series being DISCONTINUED, See VTP Series for replacement
*Series being DISCONTINUED, See VTP Series for replacement
*Replacing Viper T Series Taps
*Replacing Viper T Series Taps
STANDARD TAP SPIRAL POINTED
List 921 Fractional Sizes
P30p36
STANDARD TAP SPIRAL POINTED
List 923 Machine Screw Sizes
P31p36
List 969
STANDARD HAND TAP FOR CAST IRONP30p36
3
TAPS / VISUAL INDEX
List 910
STANDARD HAND TAPP32p36
List 920
STANDARD TAP SPIRAL POINTEDP32p36
STANDARD TAPS STANDARD HAND TAP
List 911 Fractional Sizes
P28p36
List 913 Machine Screw Size P29p36
Specs/SizesSpeeds/Feeds
Metric Sizes
Metric Sizes
T
T
T
TAPER PIPE TAP SPIRAL FLUTED
List 947 (NPT)
P34p36
TAPER PIPE TAP STRAIGHT FLUTED
List 941 (NPT)
P33p36
List 959
TAPER PIPE TAP SHORT PROJECTION
P35p36
TAPER PIPE TAP 6β EXTENSION
P35p36
4
TAPS / VISUAL INDEX
STRAIGHT PIPE TAP STRAIGHT FLUTED
TAPER PIPE TAP INTERRUPTED
P34p36
P33p36
List No. 943 (NPT)
List No. 943D (NPTF)
List No. 941D (NPTF)
List No. 947D (NPTF)
List No. 945
List No. 945D
(NPS)
(NPSF)
List No. 959D
(NPT)
(NPTF)
List 957 (NPT)
TAPER PIPE TAPSSpecs/SizesSpeeds/Feeds
TECHNICAL REFERENCE / TAPS P36-43
STRAIGHT
5
Selection Chart eat γβ γβ³
β’β’ β’ β’ Steeβ’ β’
β’
Carbon SteelAlloy Steel4140,4340
Die Steelο½20Hrc
Stainless Steel TitaniumAlloy
NickelAlloy
Cast IronGrey Ductile
1010,1018Me Ca
1035,1045 1065,1095 e e
ββ ββ
Aluminum HardenedSteel
>35Hrc
β’β’ t a
β’ ate
β’β’ S
Cutting Holes
Average
Long tool life with Stainless Steels
SGSP
577
314
419
Competitor
46
246
335
Tangled chip ejectionresults in tool breakage
Average
High-Speed Tool Steels
P/M High-Speed Tool Steels
Toug
hnes
s
D2
Alloy Tool Steels
t T
0
1
3
4
5W
T
T
Characteristics of SG Coating SG Coating (Tin + TiCN)
Composite Multi-LayerSG Coating (TiCN)
Premium PowderMetal
Properties of NACHI Premium P-HSS High toughness can be obtained even at high hardness levels
Tapping Condition M6 x 1 Depth 12 mm25 SFM
304 StainlessVertical m/c
T15
T1M7
M35
T4
T5
M42
M4
HSSE-V
P-HSS
PREMIUMP-HSS
γβ³ β³
Work Materials
TECHNICAL INFORMATION / SGSP & SGPO TAP
Application
Characteristics
Properties Performance
Features
More information for SGSP Taps can be found on pages 6, 7More information for SGPO Taps can be found on pages 8, 9
Modified Bottoming Style 2.5 Thread ChamferSG CoatingDIN Overall LengthPremium Powdered High Speed Steel
dn
Ln
Lc
Ds
L
Lk K
FAX
3
45ΒΊ
1
2
1 piece per package
List 6800 Metric Sizes
EDP NoDimensions
OverallLength
Length ofThread
ShankDia.
SizeThreadLimit
No. ofFlutes Under Neck
Length
1486233
1486256
1486262
1486279
1486307
1486313
1486320
1486336
1514479
1486342
1514491
1514513
1514536
1514559
1514594
M3 X 0.5
M4 X 0.7
M5 X 0.8
M6 X 1.0
M8 X 1.25
M10 X 1.25
M10 X 1.5
M12 X 1.25
M12 X 1.5
M12 X 1.75
M14 X 2.0
M16 X 2.0
M18 X 2.5
M20 X 2.5
M24 X 3.0
D3
D4
D5
D6
D7
D8
3F
4F
2.205
2.480
2.756
3.150
3.543
3.937
3.937
3.937
3.937
4.331
4.331
4.331
4.921
5.512
6.299
0.228
0.307
0.374
0.453
0.594
0.594
0.740
0.634
0.780
0.882
1.024
1.024
1.280
1.280
1.535
0.626
0.689
0.874
1.000
1.126
1.252
1.425
1.669
1.748
1.937
1.996
2.323
0.141
0.168
0.194
0.255
0.318
0.381
0.367
0.429
0.480
0.542
0.652
0.760
Style
1
2
3
L Ln Ds
6
HIGH PERFORMANCE TAPS
SGSP-DIN Spiral Fluted Tap
Work Material Tapping Speed SFMLow Carbon Steel 1010 1018 30 - 100
Medium Carbon Steel 1035 1045 30 - 120
High Carbon Steel 1065 1095 30 - 120
Alloy Steel 4140 4130 25 - 50
Die Steel D2 H13 (up to 20 HRC) 20 - 50
303 304 316 15 - 30
Stainless Steel 410 430
Aluminum 6061 7075 Casting
Cast Iron Grey Nodular
17-4PH
Austentic
Martenstic 15 - 25
15 - 25
35 - 120
30 - 80
Hardened Steel ~ 35 HRC 15 - 45
SGSP Work Material & Cutting Condition Recommendations
METRIC SIZES
WARNING: Cancer - www.P65Warnings.ca.gov!
Modified Bottoming Style 2.5 Thread ChamferSG CoatingDIN Overall LengthPremium Powdered High Speed Steel
EDP NoDimensions
OverallLength
Length ofThread
ShankDia.
MACHINE SCREW SIZES
6-32
8-32
10-24
10-32
12-24
FRACTIONAL SIZES
List 6801 Machine Screw & Fractional Sizes
dn
Ln
Lc
Ds
L
Lk K
FAX
3
45ΒΊ
1
2
Size Thread Limit
No. ofFlutes Under Neck
Length
1486439
1486451
1486474
1486480
1486497
H3
3F2.205
2.480
2.756
2.756
3.150
0.374
0.374
0.496
0.374
0.496
0.689
0.752
0.874
0.874
0.937
0.168
0.194
0.220
1486519
1540488
1486525
1540494
1486531
1540500
1486548
1540516
1486554
1540522
1486560
1540539
1486577
1540545
1486583
1/4 - 20
3F
3.150
3.150
3.150
3.150
3.543
3.543
3.543
3.5433.937
3.937
3.543
3.543
3.937
3.937
3.937
0.606
0.606
0.413
0.413
0.697
0.697
0.480
0.480
0.783
0.783
0.480
0.480
0.894
0.894
0.626
1.000 0.255
Style
1
2
3
L Ln Ds
2-56
4-40
1
1
H2 1.772
2.205
0.441
0.272
0.591
0.563
0.141
7
HIGH PERFORMANCE TAPS
SGSP-DIN Spiral Fluted Tap
1540459
1540465
6-32
8-32
H2
H2
H2
H3
H3
H3
H3
2.205
2.480
0.374
0.374
0.689
0.752
1486590
1540568
1486605
1540574
1514622
1540580
1514639
1540597
1514645
1540602
1514651
1540619
1514680
1540625
4F
4.331
4.331
3.937
3.937
4.331
4.331
3.937
3.937
4.921
4.921
4.331
4.331
6.299
6.299
1.024
1.024
0.646
0.646
1.185
1.185
0.732
0.732
1.303
1.303
0.827
0.827
1.626
1.626
1540551 3.937 0.626
1
1/4 - 28
H3
H5
H3
H4H3
H5
H3
H4H3
H5
H3
H4
5/16 - 18
5/16 - 24
3/8 - 16
3/8 - 24
1.126 0.318
1.252 0.381
7/16 - 14
7/16 - 20
1/2 - 13
1/2 - 20
5/8 - 11
5/8 - 18
3/4 - 10
3/4 - 16
1 - 8
H3
H5H3
H5
H3
H5
H3
H5
H4
H6
H4
H6
H4
H6H4
H6
H4
H6
1.236 0.323
1.425 0.367
1.748 0.480
1.937 0.590
2.323 0.800
WARNING: Cancer - www.P65Warnings.ca.gov!
10-32 1540471 2.756 0.496 0.874H2 0.194
Plug Style 5 Thread ChamferSG CoatingDIN Overall LengthPremium Powdered High Speed Steel
FAX
8
HIGH PERFORMANCE TAPS
SGPO-DIN Spiral Pointed Tap
Οdn
Ln
Lc
ΟDs
LLk K
β
1 2
43
1 piece per package
List 6802 Metric SizesEDP No Dimensions
OverallLength
Length ofThread
ShankDia.Nominal Size D3No. of
FlutesUnder Neck
Length
1542451
1542898
1542903
1542910
1542926
1542932
1542949
1542955
1542978
1542961
1542468
1542474
1542480
1542497
1542502
M3
M4
M5
M6
M8
M10
M10
M12
M12
M12
M14
M16
M18
M20
M24
3F
3F
3F
3F
3F
3F
3F
3F
3F
3F
3F
3F
3F
3F
3F
2.205
2.480
2.756
3.150
3.543
3.937
3.937
3.937
3.937
4.331
4.331
4.331
4.921
5.512
6.299
0.394
0.492
0.571
0.669
0.866
0.866
1.063
0.906
1.102
1.260
1.260
1.260
1.476
1.476
1.772
0.630
0.752
0.882
1.000
1.181
1.437
1.437
-
-
-
-
-
-
-
-
0.141
0.168
0.194
0.255
0.318
0.381
0.381
0.367
0.367
0.367
0.429
0.480
0.542
0.652
0.760
Style
2
3
4
Pitch
L Ln Ds
D4 D5 D6 D7 D8
0.5
0.7
0.8
1.0
1.25
1.25
1.5
1.25
1.5
1.75
2.0
2.0
2.5
2.5
3.0
Work Material Tapping Speed SFMLow Carbon Steel 1010 1018 50 - 120
Medium Carbon Steel 1035 1045 50 - 160
High Carbon Steel 1065 1095 30 - 160
Alloy Steel 4140 4130 30 - 100
Die Steel D2 H13 (up to 20 HRC) 25 - 50
303 304 316 15 - 50
Stainless Steel 410 430
Aluminum 6061 7075 Casting
Cast Iron Grey Nodular
17-4PH
Austentic
Martenstic 15 - 30
15 - 25
50 - 160
50 - 150
Hardened Steel ~ 35 HRC 25 - 60
SGPO Work Material & Cutting Condition Recommendations
METRIC SIZES
Order by EDP Number WARNING: Cancer - www.P65Warnings.ca.gov!
List 6803 Machine Screw & Fractional Sizes
9
HIGH PERFORMANCE TAPS
Plug Style 5 Thread ChamferSG CoatingDIN Overall LengthPremium Powdered High Speed Steel
FAXSGPO-DIN Spiral Pointed Tap
Οdn
Ln
Lc
ΟDs
LLk K
β
1 2
43
EDP No DimensionsOverallLength
Length ofThread
ShankDia.
MACHINE SCREW SIZES
32
32
24
24
FRACTIONAL SIZES
Nominal Size No. ofFlutes
Under NeckLength
1542519
1542531
3F
3F
3F
3F
3F
2.205
2.480
2.756
2.756
3.150
0.555
0.555
0.709
0.555
0.709
0.768
0.768
0.984
0.984
0.984
0.141
0.168
0.194
0.194
0.220
1542590
1542611
1542634
1542657
1542670
1542692
1542714
1542737
1542750
1542772
20
18
16
14
13
11
10
8
3F
3F
3F
3F
3F
3F
3F
3F
3F
3F
3F
3F
3F
3F
3F
3.150
3.150
3.543
3.543
3.937
3.543
3.937
3.937
4.331
3.937
4.331
3.937
4.921
4.331
6.299
0.850
0.618
0.945
0.709
1.063
0.709
1.142
0.902
1.232
0.902
1.181
0.835
1.299
0.937
1.626
1.181
1.181
1.299
1.299
1.457
1.457
-
-
-
-
-
-
-
-
-
0.255
0.255
0.318
0.318
0.381
0.381
0.323
0.323
0.367
0.367
0.480
0.480
0.590
0.590
0.800
Style
2
3
4
L Ln Ds
56
40
1543378
1543384
2F
2F
1.772
2.205
0.441
0.469
0.591
0.602
0.141
0.141
NC/UNC NF/UNF
Thread/Inch
6
8
12
1/4
5/16
3/8
7/16
1/2
5/8
3/4
1
2
4
3210
28
24
24
20
20
18
16
H2 H3 H4 H5 H6
1542525
1542548
1542554
1542577
1542583
1542628
1542663
1542708
1542795
1542817
1542830
1542852
1542875
1542605
1542640
1542686
1542720
1542743
1542766
1542789
1542800
1542823
1542846
1542869
1542881
1542560
1
Order by EDP Number WARNING: Cancer - www.P65Warnings.ca.gov!
0
HIGH PERFORMANCE TAPS
List No. 6958 Metric Sizes
Modified Bottoming Style 2 1/2 to 3 Thread LeadSG Coating
M3M4M5M6M8
M10
M12
M14
M16
M18
M20
M22
M24
0.50.70.8111.251.251.51.251.751.521.521.52.51.52.51.52.51.53
3
4
5961559617
5961959620596225962359624
5962559626596275962859629596305963159632
59634
59636
59638
59633
59635
59637
59639
1 15/162 1/82 3/82 1/2
2 23/32
2 15/16
3 3/8
3 19/32
3 13/16
4 1/32
4 15/32
4 11/16
4 29/32
0.2360.2760.3540.433
0.472
0.551
0.669
0.787
0.787
0.984
0.984
0.984
1.181
0.1410.1680.1940.255
0.318
0.381
0.367
0.429
0.480
0.542
0.652
0.697
0.760
3311313131131111111111
NominalSize(mm)
Pitch(mm)
No. OfFlutesGT5 GT6 GT7 GT8 GT9
OverallLength
Length ofThread
ShankDia.
Std.Pack.
DimensionsE.D.P. Numbers
METRIC
SG Lo-Spiral Fluted Tap
Stainless Steel (Austentic) 303,304,316 15-45
SG-Low Spiral Taps List No. 6958, 6959SFM : Surface Feet per Minutes
Work Materials Tapping Speed SFM
Low Carbon Steel 1010,1018 25-50Medium Carbon Steel 1035,1045 20-50High Carbon Steel 1065,1095 15-30Alloy Steel 4140,4130 15-30Die Steels D2,H13 15-35Hardened Die Steels (20-40HRC) D2,H13 8-15
Stainless Steel (Martensitic) 410,430 12-20Stainless Steel (PH) up to 35HRC 17-4PH 12-20Titanium Alloy Up to 32HRC 6AL4V 15-20
40-80Magnesium AlloyDuctile Cast Irons 80-55-06 20-50Cast Irons Nodular,Grey 30-65
1. These are general tapping condition, may be altered by your condition.
2. These conditions are for tapping depth 1.5D. In case of deeper thread you may multiply these values by the coefficient ofnext table.
Thread Depth CoefficientUp to 1.5D 1
1.5Dο½2.5D 0.92.5Dο½3D 0.8Over 3D 0.7
Tapping Speeds
Order by EDP Number
11
HIGH PERFORMANCE TAPS
List No. 6959
Modified Bottoming Style 2 1/2 to 3 Thread LeadSG Coating
56
48
40
40
32
32
24
24
2
3
4
5
6
8
10
12
64
56
48
44
40
36
32
28
3
9459794598
9460094599
94602
946339463494635946369463794638
946399464094641
94601
946039460494605946069460794608
9461094609
9461194612
94613
9461594616
9461894617
946199462094621946229462394624
94626
94628
94625
94627
94629946309463194632
1 3/4
1 13/16
1 7/8
1 15/16
2
2 1/8
2 3/8
0.437
0.500
0.236
0.276
0.354
0.141
0.168
0.194
0.220
1111311111313111
20
18
16
14
13
12
11
10
9
8
1/4
5/16
3/8
7/16
1/2
9/16
5/8
3/4
7/8
1
28
24
24
20
20
18
18
16
14
12
3
4
946142 1/2
2 23/32
2 15/16
3 5/32
3 3/8
3 19/32
3 13/16
4 1/4
4 11/16
5 1/8
0.433
0.472
0.551
0.709
0.787
0.827
0.905
0.984
1.102
1.260
0.255
0.318
0.381
0.323
0.367
0.429
0.480
0.590
0.697
0.800
13111113111111111111
Thread/InchNo. ofFlutesGT9GT8GT7GT6GT5GT4GT3
OverallLength
Length ofThread
ShankDia.
Std .Pack.
NominalSize NC
UNCNF
UNF
E.D.P. Numbers Dimensions
MACHINE SCREW SIZES
FRACTIONAL SIZES
SG Lo-Spiral Fluted Tap
Machine Screw & Fractional Sizes
Order by EDP Number
β’ Structural Steels β’ Carbon Steels β’ Alloy Steelsβ’ Stainless Steels β’ Aluminum Alloys
β’ Nachi Viper Taflet Taps are specially engineered for steels, andrequire less torque than conventional coldform taps. Thisreduces the chance of breakage.
β’ Nachi Viper Taflet Taps are steam oxide surface treated to limitadhesion from fusion, and carries coolant to the work area.Bright finish is available when required.
β’ Nachi Viper Taflet Taps have more radial sections for higheraccuracy of internal threads in steel.This compares favorably tocoldform internal threads, which aren't always clean and accurate.
DLC TAFLET
Semi-Dry TappingForming tap with DLC coating can be used in Aluminum,Aluminum Alloys, Die Cast Aluminum.The tap shown below, M6x1.0, tapped 1,000 holes inA6061 with mist hole lube applied and has minimumadhesion of material.
TAFLETFiber flow is:
Cutting TapFiber flow is:
Features of Taflet
Female thread cut by a TAFLET Female thread cut by a cutting tap
VIPER TAFLET
1000Hole
NOT INTERRUPTED INTERRUPTED
Item
Tap breakdown
Trouble causedby chipsAccuracy offemale threadFemale threadsurface roughness
Tapping torque
Female threadstrength
Workpiece
CuttingTap Taflet Taflet Features
Does not break because there is no groove
No trouble because there is no chip
Little variations because of cold forming tapping
Excellent because threads are finished by sliding overthe tap surface
1.5 through 2.5 times the torque of a cutting tap
Excellent because fiber flow is not interrupted inplastic working
Limited to the material of good malleability
Features
Work Materials
Performance
12
TECHNICAL INFORMATION / DLC TAFLET / VIPER TAFLET
DLC Taflet
Cutting ConditionSize M6x1.0Material A6061-T6Speed 15 m/min (49.2 SFM)Feed 1.0 mm/rev (0.039 IPM)Depth of Thread 13 mmCoolant Mist Lube (25cc x 2 nozzle/h)
Tapping Condition
More information for DLC Taflet can be found on pages 13, 14More information for Viper Taflet can be found on pages 15-17
xide surfrr ace treated to limits coolant to the work area.quired.adial sections for hr ighereel.This compares favorarr bly toaren't alwaysyy clean and accurate.
List No. 6956 Metric Sizes
Bottoming StyleDLC Coating
M2M2.5M3M4M5M6M8
M10
M12
0.40.450.50.70.81
1.25
1.51.75
910029100891011
9101791023
910269103591038
9102791036
9104191047
1 3/41 13/161 15/162 1/82 3/82 1/22 23/32
2 15/16
3 3/8
0.4370.5000.3940.4720.5510.5910.669
0.748
0.984
0.1190.1190.1410.1680.1940.2550.318
0.381
0.367
1111133313
NominalSize(mm)
OverallLength
E. D. P. Numbers DimensionsPitch(mm) D3 D4 D5 D6 D7 D8 D9 D10
Length ofThread
ShankDia.
Std.Pack.
Forming TAP with DLC coating can be used in Aluminum Alloy,Die Cast Aluminum and Copper.
3
DLC Taflet Thread Forming Taps
HIGH PERFORMANCE TAPS
DLC Taflet Thread Forming Taps List No. 6955, 6956, 6957
Work Materials Tapping SpeedSFM
70 - 130 Aluminum Alloys
Tapping Speeds
Order by EDP Number
1/4
5/16
3/8
7/161/2
20
18
16
1413
28
24
24
9783897840
978739787597877978799788197885
9791297914
97931979339793597937
9796197965
2 1/2
2 23/32
2 15/16
3 5/323 3/8
0.591
0.669
0.748
0.8660.984
0.255
0.318
0.381
0.3230.367
11133333
NominalSize Overall
Length
E. D. P. Numbers Dimensions
NCUNC
NFUNF
H2 H3 H4 H5 H6 H7 H8 H10
Thread/Inch
Length ofThread
ShankDia.
Std.Pack.
List No. 6955 Fractional Size
Bottoming StyleDLC Coating
List No. 6957 Machine Screw Sizes
Bottoming StyleDLC Coating
2468
10
12
5640323224
2432
97738 97776977849779297796
978309783297834
978579786597869
979049790697908
1 3/41 7/822 1/82 3/82 3/82 3/8
0.4370.3540.4330.4720.5510.5510.551
0.141
0.168
0.194
0.220
3111313
NominalSize Overall
Length
E. D. P. Numbers Dimensions
NCUNC
NFUNF
H2 H3 H4 H5 H6 H7 H8 H10
Thread/Inch
Length ofThread
ShankDia.
Std.Pack.
14
HIGH PERFORMANCE TAPS
DLC Taflet Thread Forming Tap
Order by EDP Number
Order by EDP Number
List No. 996 Metric Sizes
Plug & Bottoming StyleSurface Treated
VANADIUM HIGH SPEED STEEL HSSE-V
PBPBPBPBPBPBPBPBPBPBPBPBPBPBPBPBPBPBPBPBPBPBPBPB
51001510025100451005510075100851010510115101351014
ββββββββββββββββββββββββββββββββββββββ
1 3/4
1 13/16
1 15/16
2
2 1/8
2 3/8
2 1/2
2 23/32
2 15/16
3 3/8
3 19/32
3 13/16
4 1/32
4 15/32
0.437
0.500
0.394
0.433
0.472
0.551
0.591
0.669
0.748
0.984
1.102
1.181
0.119
0.141
0.168
0.184
0.194
0.255
0.318
0.381
0.367
0.429
0.480
0.542
0.652
333333113313333331333311333131133333313333333333
D10 D11D9D8D7D6D5
ββββββββββ
510165101751019510205102251023
ββββββββββββββββββββββββββββββββ
ββββββββββββββββ
5102551026
ββ
5103151032
ββββββββββββββββββββββββββ
ββββββββββββββββββ
5102851029
ββββββββββββββββββββββββββββ
ββββββββββββββββββββββββββββββββββββββββββββββββ
ββββββββββββββββββββββ
51034510355103751038
ββββββββββββββββββββββ
ββββββββββββββββββββββββββ
51040510415104351044
ββββββββββββββββββ
ββββββββββββββββββββββββββββββ
51046510475104951050
ββ
5105551056
ββ
5106151062
ββ
5106751068
ββ
ββββββββββββββββββββββββββββββββββ
5105251053
ββ
5105851059
ββ
5106451065
ββ
5107051071
D4D3OverallLength
Length ofThread
ShankDia.
Std .Pack.
NominalSize
(mm)
E.D.P. Numbers Dimensions
0.4
0.45
0.45
0.5
0.6
0.7
0.75
0.8
1
1
1
1.25
1.25
1.50
1.25
1.75
1.5
2
1.5
2
1.5
2.5
1.5
2.5
M2
M2.2
M2.5
M3
M3.5
M4
M4.5
M5
M6
M7
M8
M10
M12
M14
M16
M18
M20
Pitch(mm)
ChamferStyle*
* P : Plug, B : Bottom
15
Viper Taflet for Steel
HIGH PERFORMANCE TAPS
Order by EDP Number
List No. 995 Fractional Sizes
Plug & Bottoming StyleSurface Treated
VANADIUM HIGH SPEED STEEL HSSE-V
20
18
16
14
13
12
11
10
28
24
24
20
20
18
18
16
PBPBPBPBPBPBPBPBPBPBPBPBPBPBPBPB
2 1/2
2 23/32
2 15/16
3 5/32
3 3/8
3 19/32
3 13/16
4 1/4
0.591
0.669
0.748
0.866
0.984
0.984
1.102
1.181
0.255
0.318
0.381
0.323
0.367
0.429
0.480
0.590
33333333313333333333333333333333
Thread/Inch
Chamfer Style*H8 H10H7H6H5H4
77837778387783977840
ββββββββββββββββββββββββββββ
ββββ
77872778737787477875778767787777878778797788077881778827788377884778857788677887
ββββββββββββ
77911779127791377914
ββββββββββββββββββββββββββββ
ββββ
7793077931779327793377934779357793677937
ββββββββ
779467794777948779497795077951779527795377954779557795677957
ββββββββββββ
7796077961779627796377964779657796677967
ββββββββββββ
77978779797798077981
ββββββββββββββββ
779907799177992779937799477995779967799777998779997800078001
OverallLength
Length ofThread
ShankDia.
Std .Pack.
NominalSize
NCUNC
NFUNF
E.D.P. Numbers Dimensions
1/4
5/16
3/8
7/16
1/2
9/16
5/8
3/4
* P : Plug, B : Bottom
16
HIGH PERFORMANCE TAPS
Viper Taflet for Steel
Order by EDP Number
List No. 995 Machine Screw Sizes
Plug & Bottoming StyleSurface Treated
VANADIUM HIGH SPEED STEEL HSSE-V
64
56
48
40
40
32
32
24
24
80
72
64
56
48
44
40
36
32
28
BBBBBBBPBPBPBPBPBPBPBPBPBPBPBPB
1 5/8
1 11/16
1 3/4
1 13/16
1 7/8
1 15/16
2
2 1/8
2 3/8
0.311
0.374
0.437
0.500
0.354
0.394
0.433
0.472
0.551
0.141
0.168
0.194
0.220
1333333333333333333333333333333
Thread/Inch
Chamfer Style*H10H6H5H4H3
777327773477736777387774077742
ββββββββββββββββββββββββ
βββ
7777677778777807778277783777847778577786777877778877789777907779177792777937779477795777967779777798
ββββββββ
βββββββββββββββββββββββ
7782977830778317783277833778347783577836
βββββββ
77856778577785877859778607786177862778637786477865778667786777868778697787077871
ββββββββ
βββββββββββββββββββββββ
7790377904779057790677907779087790977910
βββββββββββββββ
7797077971
ββ
7797277973
ββ
77974779757797677977
ββββ
H2OverallLength
Length ofThread
ShankDia.
Std.Pack.NC
UNCNF
UNF
E.D.P. Numbers Dimensions
0
1
2
3
4
5
6
8
10
12
* P : Plug, B : Bottom
NominalSize
17
Viper Taflet for Steel
HIGH PERFORMANCE TAPS
Order by EDP Number
77744
β’ VTP Series are suitable for various material.
Nachi VTP Series Taps were specifically designedto overcome the major difficulties of spiral fluted taps:oversizing and chip control. An all-new approach to theselimitations also provides double-action tapping - cuttingwith chamfered teeth, plus cold rolled forming with aspecially engineered shape of thread that we call Taflet Relief.
The results provide two-fold benefits. The first is minimalor no oversized thread diameter over the entire threadlength, with smooth thread surfaces. The second is smooth
chip ejecion, ensuring freedome from chips for trouble-freeperformance, especially on machining centers and on unattended machining lines.
Conventional Taps VTP-Series Taps
β’ Structural Steels β’ Carbon Steelsβ’ Alloy Steels β’ Stainless Steelsβ’ Aluminum Alloys
β’ Taflet Relief
β’ Chamfered Teeth
Features
Work Materials
Performance
8
TECHNICAL INFORMATION / VTP SERIES TAP
More information for VTP Series can be found on pages 19-21
VTP Series Taps
List No. 980 Metric Sizes
VANADIUM HIGH SPEED STEEL HSSE-V
Modified Bottoming Style 2-1/2 To 3 Thread LeadSurface Treated
List No. 982 Metric Sizes
Plug Style, 4 To 5 Thread LeadSurface Treated
VANADIUM HIGH SPEED STEEL HSSE-V
3
54615βββββββββββββββββ
β546165461754619
ββββββββββββββ
ββββ
5462054621546225462354624
β54626
βββββββ
βββββββββ
54625β
5462754628
β54630
β54632
β
βββββββββββββ
54629β
54631β
54633
0.2360.2760.2760.3540.433
0.472
0.551
0.630
0.5510.7090.5510.7090.5510.874
0.1410.1410.1680.1940.255
0.318
0.381
0.367
0.429
0.480
0.542
No. OfFlutesD3
Pitch(mm) D4 D5 D6 D7
OverallLength
Length ofThread
ShankDia.
NominalSize
(mm)
E.D.P. Number Dimensions
M3M3.5M4M5M6M7
M8
M10
M12
M14
M16
M18
0.50.60.70.81111.251.251.51.251.751.521.521.52.5
1 15/1622 1/82 3/82 1/2
2 23/32
2 15/16
3 3/8
3 19/32
3 13/16
4 1/32
111111311111111111
3
52615βββββββββββββββββ
β526165261752619
ββββββββββββββ
ββββ
5262052621526225262352624
β52626
βββββββ
βββββββββ
52625β
5262752628
β52630
β52632
β
βββββββββββββ
52629β
52631β
52633
0.3940.4330.4720.5510.591
0.669
0.748
0.984
1.102
0.1410.1410.1680.1940.255
0.318
0.381
0.367
0.429
0.480
0.542
No. OfFlutesD3
Pitch(mm) D4 D5 D6 D7
OverallLength
Length ofThread
ShankDia.
NominalSize
(mm)
E.D.P. Number Dimensions
M3M3.5M4M5M6M7
M8
M10
M12
M14
M16
M18
1 15/1622 1/82 3/82 1/2
2 23/32
2 15/16
3 3/8
3 19/32
3 13/16
4 1/32
111113311131313133
0.50.60.70.81111.251.251.51.251.751.521.521.52.5
19
HIGH PERFORMANCE TAPS
VTP Tap Spiral Fluted
VTP Tap Spiral Pointed
Std.Pack.
Std.Pack.
*Replacing VIPER T Series
*Replacing VIPER T Series
Order by EDP Number
Order by EDP Number
List No. 983 Machine Screw Sizes
Modified Bottoming Style 2-1/2 To 3 Thread LeadSurface Treated
VANADIUM HIGH SPEED STEEL HSSE-V
23
4
56
8
10
564840
4032
3224
32
2
3
882398824088241
88253β
βββ
ββ
88242
β88263
882778829188299
ββ
88243
β88264
88278β
88300
βββ
β88265
882798829288301
βββ
β88266
8828088293
β
βββ
β88267
882818829488303
1 3/41 13/16
1 7/8
1 15/16
2
2 1/8
2 3/8
0.4330.500
0.236
0.276
0.354
0.141
0.168
0.194
13
3
3
3
3
3
3
Thread/InchNo. ofFlutesH2 H3 H4 H5 H6 H7
OverallLength
Length ofThread
ShankDia.
Std.Pack.
NominalSize NC
UNCNF
UNF
E.D.P. Numbers Dimensions
1/4
5/16
3/8
7/16
1/2
9/16
5/8
3/4
7/8
1
20
18
16
14
13
12
11
10
9
8
28
24
24
20
20
18
18
16
14
3
4
βββββββββββββββββββ
88057880718808188095881038811188117881238813188139881458814688149881578816788175881808818588190
β88072
β88096
β88112
βββββββββββββ
88060880738808388097881058811388119881258813388141
ββ
8815188159
β88177
βββ
β88074
βββββββββββββββββ
880628807588085880988810788115
ββ
88135βββ
88153β
88171ββββ
2 1/2
2 23/32
2 15/16
3 5/32
3 3/8
3 19/32
3 13/16
4 1/4
4 11/16
5 1/8
0.433
0.472
0.551
0.591
0.630
0.709
0.748
0.827
0.906
0.984
0.255
0.318
0.381
0.323
0.367
0.429
0.480
0.590
0.697
0.800
131313311131111111
1
List No. 981 Fractional Sizes
FRACTIONAL - L981
MACHINE SCREW SIZES - L983
20
HIGH PERFORMANCE TAPS
VTP Spiral Fluted
*Replacing VIPER T Series
Order by EDP Number
48 88245 β β ββ β
40 88269 β β β β β
12 2428
ββ
8831188312
ββ
ββ
ββ
ββ
0.220
12 β 88192 β β ββ
List No. 973 Machine Screw Sizes
Plug Style 4 to 5 ThreadsSurface Treated
VANADIUM HIGH SPEED STEEL HSSE-V
234
56
8
10
564840
4032
3224
32
2
3
872168722087240
8725287258
87272β
87294
87218β
87242
β87260
872748728887296
ββ
87243
β87261
87275β
87297
ββ
87244
β87264
872788729087300
βββ
β87265
87279β
87301
βββ
β87266
87280β
87302
1 3/41 13/16
1 7/8
1 15/16
2
2 1/8
2 3/8
0.4370.500
0.354
0.394
0.433
0.472
0.551
0.141
0.168
0.194
33
3
3
3
3
3
3
Thread/InchNo. ofFlutesH2 H3 H4 H5 H6 H7
Overall Length
Length of Thread
Shank Dia.
NominalSize NC
UNCNF
UNF
E.D.P. Numbers Dimensions
List No. 971 Fractional Sizes
1/4
5/16
3/8
7/16
1/2
9/16
5/8
3/4
7/8
1
20
18
16
14
13
12
11
10
9
8
28
24
24
20
20
18
18
16
14
3
8705287066
βββββββββββββββββ
87056870688708087094871028711087116871228713087138871438714487148871588716487168871708717187172
β87070
β87096
β87112
βββββββββββββ
87060870718708487097871048711387120871268713487140
ββ
8715287159
β87169
βββ
β87072
β87098
β87114
β87127
β87141
βββββββββ
870628707387086870998710687115
β871298713687142
ββ
87154β
87167ββββ
2 1/2
2 23/32
2 15/16
3 5/32
3 3/8
3 19/32
3 13/16
4 1/4
4 11/16
5 1/8
0.591
0.669
0.748
0.866
0.984
1.102
1.181
1.299
1.378
0.255
0.318
0.381
0.323
0.367
0.429
0.480
0.590
0.697
0.800
333333333311333113
1
21
HIGH PERFORMANCE TAPS
VTP Spiral Pointed
MACHINE SCREW SIZES - L973
FRACTIONAL SIZES - L971
Std.Pack.
These are general tapping conditions, may be altered by your condition.These conditions are for tapping depth 1.5D. In case of deeper thread
Nodular,Grey
D2,H13 4140,4130 15-401065,1095 15-251035,1045 15-40
6-12
10-15
15-40
15-40
25-50
1010,1018 30-60
Stainless steel (Martensitic) 410,430 10-25Stainless steel (Austentic) 303,304,316 10-25
Work Materials Tapping Speed SFM
Low Carbon SteelMedium Carbon SteelHigh Carbon SteelAlloy SteelDie Steels 10-25Hardened Die Steels (20-40HRC) D2,H13
Stainless steel (PH) up to 35HRC 17-4PH 8-15Titanium Alloy Up to 32HRC 6AL4V
30-60Ductile Cast Irons 80-55-06Cast Irons Nodular,Grey -Copper
40-60Brass, Brass Casting Bronze, Brass Casting
SFM: Surface Feet per MinutesVTP Spiral Flute TAP List 980, 983, 981
These are general tapping conditions, may be altered by your condition.1.These conditions are for tapping depth 1.5D. In case of deeper thread2.
Thread Depth CoefficientUp to 1.5D 1
1.5Dο½2.5D 0.92.5Dο½3D 0.8
Over 3D 0.7
SFM: Surface Feet per MinutesVTP Spiral Point TAP List 982, 973, 971
Work Materials Tapping Speed SFM
VTP Series Tapping Speeds
Magnesium Alloy
you may multiply these values by the coefficient of next table
15-20
20-50
20-50
30-60
Low Carbon SteelMedium Carbon SteelHigh Carbon SteelAlloy SteelDie SteelsHardened Die Steels (20-40HRC) D2,H13
Stainless steel (PH) up to 35HRC 17-4PHTitanium Alloy Up to 32HRC 6AL4V
40-80Ductile Cast Irons 80-55-06Cast Irons 30-60Copper
50-80Brass, Brass CastingBronze, Brass Casting
Magnesium Alloy
4140,4130 20-50
1035,1045 20-50
Stainless steel (Martensitic) 410,430 15-35Stainless steel (Austentic) 303,304,316 15-35
D2,H13
1010,1018 35-75
1065,1095 15-30
38-1515-30
10-20
you may multiply these values by the coefficient of next table
1.2.
*Replacing VIPER T Series
Order by EDP Number
48 87245 β β β β β
40 87269 β β β β β
0.500 0.22012 2428
ββ
8731187312
ββ
ββ
ββ
ββ
12 β 87176 β β ββ
List No. 7980 Metric Sizes, General Purpose Modified Bottoming Style, 2 1/2 to 3 Thread, Surface Treated
VANADIUM HIGH SPEED STEEL HSSE-V
List No. 7970 Metric Sizes, General Purpose Plug Style 4 to 5 Thread, Surface Treated
VANADIUM HIGH SPEED STEEL HSSE-V
3
4
576155761657617
βββββββββββββββββββββ
βββ
576195762057621576225762357624
βββββββββββββββ
βββββββββ
57625ββββββββββββββ
ββββββββββ
57626576275762857629576305763157632
β57634
β57636
β57638
β
βββββββββββββββββ
57633β
57635β
57637β
57639
0.2360.2760.2760.3540.433
0.472
0.551
0.669
0.787
0.984
1.181
0.1410.1410.1680.1940.255
0.318
0.381
0.367
0.429
0.480
0.542
0.652
0.697
0.760
No. OfFlutesGT5
Pitch(mm) GT6 GT7 GT8 GT9
OverallLength
Length ofThread
ShankDia.
Std.Pack.
NominalSize(mm)
E.D.P. Number Dimensions
M3M3.5M4M5M6M7
M8
M10
M12
M14
M16
M18
M20
M22
M24
METRIC0.50.60.70.81111.251.251.51.251.751.521.521.52.51.52.51.52.51.53
1 15/1622 1/82 3/82 1/2
2 23/32
2 15/16
3 3/8
3 19/32
3 13/16
4 1/32
4 15/32
4 11/16
4 29/32
133113131131113133311131
3
4343
586155861658617
βββββββββββββββββββββ
βββ
586195862058621586225862358624
βββββββββββββββ
βββββββββ
58625ββββββββββββββ
ββββββββββ
58626586275862858629586305863158632
β58634
β58636
β58638
β
βββββββββββββββββ
58633β
58635β
58637β
58639
0.3940.4330.4720.5510.591
0.669
0.748
1.142
1.181
1.260
1.457
1.496
1.772
0.1410.1410.1680.1940.255
0.318
0.381
0.367
0.429
0.480
0.542
0.652
0.697
0.760
No. OfFlutesGT5
Pitch(mm) GT6 GT7 GT8 GT9
OverallLength
Length ofThread
ShankDia.
Std.Pack.
NominalSize(mm)
E.D.P. Number Dimensions
M3M3.5M4M5M6M7
M8
M10
M12
M14
M16
M18
M20
M22
M24
METRIC0.50.60.70.81111.251.251.51.251.751.521.521.52.51.52.51.52.51.53
1 15/1622 1/82 3/82 1/2
2 23/32
2 15/16
3 3/8
3 19/32
3 13/16
4 1/32
4 15/32
4 11/16
4 29/32
111113113111313113113131
22
HIGH PERFORMANCE TAPS
Viper T Series Spiral Fluted
*Series being DISCONTINUED, See VTP Series for replacement
Order by EDP Number
Order by EDP Number
Viper T Series Spiral Pointed
List No. 7981
Modified Bottoming Style, 2 1/2 To 3 Thread LeadSurface Treated
VANADIUM HIGH SPEED STEEL HSSE-V
2
3
4
5
6
8
10
12
MACHINE SCREW SIZES56
48
40
40
32
32
24
24
64
56
48
44
40
36
32
28
3
ββββββββββββββββ
1 3/4
1 13/16
1 7/8
1 15/16
2
2 1/8
2 3/8
0.437
0.500
0.236
0.276
0.354
0.141
0.168
0.194
0.220
1313333311131131
Thread/InchNo. ofFlutesGT9
ββββββββββββββββ
GT8
ββββββββββββββββ
GT7
ββββββββββββ
97609β
9761197612
GT6
ββββ
97601β
976039760497605976069760797608
β97610
ββ
GT5
ββ
97599ββ
97602ββββββββββ
GT4
9759797598
β97600
ββββββββββββ
1/4
5/16
3/8
7/16
1/2
9/16
5/8
3/4
7/8
1
FRACTIONAL SIZES20
18
16
14
13
12
11
10
9
8
28
24
24
20
20
18
18
16
14
12
3
4
ββββββββββββ
97625β
97627β
97629976309763197632
2 1/2
2 23/32
2 15/16
3 5/32
3 3/8
3 19/32
3 13/16
4 1/4
4 11/16
5 1/8
0.433
0.472
0.551
0.709
0.787
0.827
0.906
0.984
1.102
1.260
0.255
0.318
0.381
0.323
0.367
0.429
0.480
0.590
0.697
0.800
13131331133113111313
ββββ
97617β
976199762097621976229762397624
β97626
β97628
ββββ
97613β
9761597616
β97618
ββββββββββββββ
β97614
ββββββββββββββββββ
ββββββββββββββββ
97715977209772597730
97633976389764397648976539765897663976689767397678976839768897693976989770597710
ββββ
ββββββββββββββββββββ
GT3OverallLength
Length ofThread
ShankDia.
Std .Pack.
NominalSize NC
UNCNF
UNF
E.D.P. Numbers Dimensions
23
HIGH PERFORMANCE TAPS
Viper T Series Spiral Fluted
*Series being DISCONTINUED, See VTP Series for replacement
Order by EDP Number
Machine Screw & Fractional Sizes, General Purpose
VANADIUM HIGH SPEED STEEL HSSE-V
List No. 7971
Plug Style, 4 to 5 ThreadSurface Treated
MACHINE SCREW SIZES56
48
40
40
32
32
24
24
64
56
48
44
40
36
32
28
2
3
ββββββββββββββββ
1 3/4
1 13/16
1 7/8
1 15/16
2
2 1/8
2 3/8
0.437
0.500
0.354
0.394
0.433
0.472
0.551
0.141
0.168
0.194
0.220
3333113313131113
Thread/InchNo. ofFlutesGT9
ββββββββββββββββ
GT8
ββββββββββββββββ
GT7
ββββββββββββ
98609β
9861198612
GT6
ββββ
98601β
986039860498605986069860798608
β98610
ββ
GT5
ββ
98599ββ
98602ββββββββββ
GT4
9859798598
β98600
ββββββββββββ
FRACTIONAL SIZES20
18
16
14
13
12
11
10
9
8
28
24
24
20
20
18
18
16
14
12
3
434
ββββββββββββ
98625β
98627β
98629986309863198632
2 1/2
2 23/32
2 15/16
3 5/32
3 3/8
3 19/32
3 13/16
4 1/4
4 11/16
5 1/8
0.591
0.669
0.748
0.984
1.142
1.181
1.260
1.457
1.496
1.772
0.255
0.318
0.381
0.323
0.367
0.429
0.480
0.590
0.697
0.800
13131133133313133313
ββββ
98617β
986199862098621986229862398624
β98626
β98628
ββββ
98613β
9861598616
β98618
ββββββββββββββ
β98614
ββββββββββββββββββ
ββββββββββββββββ
98715987209872598730
98633986389864398648986539865898663986689867398678986839868898693986989870598710
ββββ
ββββββββββββββββββββ
GT3OverallLength
Length ofThread
ShankDia.
Std .Pack.
NominalSize NC
UNCNF
UNF
E.D.P. Numbers Dimensions
2
3
4
5
6
8
10
12
1/4
5/16
3/8
7/16
1/2
9/16
5/8
3/4
7/8
1
24
Viper T Series Spiral Pointed
HIGH PERFORMANCE TAPS
*Series being DISCONTINUED, See VTP Series for replacement
Order by EDP Number
Machine Screw & Fractional Sizes, General Purpose
List No. 7982 Metric SizesModified Bottoming Style 2 1/2 To 3 Thread Lead, Surface Treated
VANADIUM HIGH SPEED STEEL
List No. 7972 Metric SizesPlug Style 4 to 5 Thread Lead, Surface Treated
VANADIUM HIGH SPEED HSSE STEEL
3
4
566155661656617
βββββββββββββββββββββ
βββ
566195662056621566225662356624
βββββββββββββββ
βββββββββ
56625ββββββββββββββ
ββββββββββ
56626566275662856629566305663156632
β56634
β56636
β56638
β
βββββββββββββββββ
56633β
56635β
56637β
56639
0.2360.2760.2760.3540.433
0.472
0.551
0.669
0.787
0.984
1.181
0.1410.1410.1680.1940.255
0.318
0.381
0.367
0.429
0.480
0.542
0.652
0.697
0.760
No. OfFlutesGT5
Pitch(mm) GT6 GT7 GT8 GT9
OverallLength
Length ofThread
ShankDia.
Std.Pack.
NominalSize
(mm)
DimensionsE.D.P. Number
M3M3.5M4M5M6M7M8
M10
M12
M14
M16
M18
M20
M22
M24
METRIC0.50.60.70.81111.251.251.51.251.751.521.521.52.51.52.51.52.51.53
1 15/1622 1/82 3/82 1/2
2 23/32
2 15/16
3 3/8
3 19/32
3 13/16
4 1/32
4 15/32
4 11/16
4 29/32
111113311113111113311111
3
4343
556155561655617
βββββββββββββββββββββ
βββ
556195562055621556225562355624
βββββββββββββββ
βββββββββ
55625ββββββββββββββ
ββββββββββ
55626556275562855629556305563155632
β55634
β55636
β55638
β
βββββββββββββββββ
55633β
55635β
55637β
55639
0.3940.4330.4720.5510.591
0.669
0.748
1.141
1.181
1.260
1.457
1.457
1.496
1.772
0.1410.1410.1680.1940.255
0.318
0.381
0.367
0.429
0.480
0.542
0.652
0.697
0.760
No. OfFlutesGT5 GT6 GT7 GT8 GT9
OverallLength
Length ofThread
ShankDia.
Std.Pack.
M3M3.5M4M5M6M7
M8
M10
M12
M14
M16
M18
M20
M22
M24
METRIC0.50.60.70.81111.251.251.51.251.751.521.521.52.51.52.51.52.51.53
1 15/1622 1/82 3/82 1/2
2 23/32
2 15/16
3 3/8
3 19/32
3 13/16
4 1/32
4 15/32
4 11/16
4 29/32
111111111131111111111111
Pitch(mm)
NominalSize
(mm)
DimensionsE.D.P. Number
25
Viper T Series Spiral Fluted
HIGH PERFORMANCE TAPS
*Series being DISCONTINUED, See VTP Series for replacement
Order by EDP Number
Order by EDP Number
Viper T Series Spiral Pointed
List No. 7987
Modified Bottoming Style 2 1/2 to 3 Thread LeadSurface Treated
VANADIUM HIGH SPEED STEEL HSSE
2
3
4
5
6
8
10
12
MACHINE SCREW SIZES
56
48
40
40
32
32
24
24
64
56
48
44
40
36
32
28
3
ββββββββββββββββ
1 3/4
1 13/16
1 7/8
1 15/16
2
2 1/8
2 3/8
0.437
0.500
0.236
0.276
0.354
0.141
0.168
0.194
0.220
1313113311131133
Thread/InchNo. ofFlutesGT9
ββββββββββββββββ
GT8
ββββββββββββββββ
GT7
ββββββββββββ
96609β
9661196612
GT6
ββββ
96601β
966039660496605966069660796608
β96610
ββ
GT5
ββ
96599ββ
96602ββββββββββ
GT4
9659796598
β96600
ββββββββββββ
1/4
5/16
3/8
7/16
1/2
9/16
5/8
3/4
7/8
1
FRACTIONAL SIZES
20
18
16
14
13
12
11
10
9
8
28
24
24
20
20
18
18
16
14
12
3
4
ββββββββββββ
96625β
96627β
96629966309663196632
2 1/2
2 23/32
2 15/16
3 5/32
3 3/8
3 19/32
3 13/16
4 1/4
4 11/16
5 1/8
0.433
0.472
0.551
0.709
0.787
0.827
0.905
0.984
1.102
1.260
0.255
0.318
0.381
0.323
0.367
0.429
0.480
0.590
0.697
0.800
11111131111111131113
ββββ
96617β
966199662096621966229662396624
β96626
β96628
ββββ
96613β
9661596616
β96618
ββββββββββββββ
β96614
ββββββββββββββββββ
ββββββββββββββββββββ
ββββββββββββββββββββ
ββββββββββββββββββββ
GT3OverallLength
Length ofThread
ShankDia.
Std .Pack.
NominalSize NC
UNCNF
UNF
E.D.P. Numbers Dimensions
26
Viper T Series Spiral Fluted
HIGH PERFORMANCE TAPS
*Series being DISCONTINUED, See VTP Series for replacement
Order by EDP Number
Machine Screw & Fractional Sizes
These are general tapping conditions, may be altered by your condition.These conditions are for tapping depth 1.5D. In case of deeper thread
27
List No. 7977VANADIUM HIGH SPEED STEEL HSS
MACHINE SCREW SIZES56
48
40
40
32
32
24
24
64
56
48
44
40
36
32
28
2
3
ββββββββββββββββ
1 3/4
1 13/16
1 7/8
1 15/16
2
2 1/8
2 3/8
0.437
0.500
0.354
0.394
0.433
0.472
0.551
0.141
0.141
0.141
0.141
0.141
0.168
0.194
0.220
1311133111331113
Thread/InchNo. ofFlutesGT9
ββββββββββββββββ
GT8
ββββββββββββββββ
GT7
ββββββββββββ
95609β
9561195612
GT6
ββββ
95601β
956039560495605956069560795608
β95610
ββ
GT5
ββ
95599ββ
95602ββββββββββ
GT4
9559795598
β95600
ββββββββββββ
FRACTIONAL SIZES20
18
16
14
13
12
11
10
9
8
28
24
24
20
20
18
18
16
14
12
3
434
ββββββββββββ
95625β
95627β
95629956309563195632
2 1/2
2 23/32
2 15/16
3 5/32
3 3/8
3 19/32
3 13/16
4 1/4
4 11/16
5 1/8
0.591
0.669
0.748
0.984
1.142
1.181
1.260
1.457
1.496
1.772
0.255
0.318
0.381
0.323
0.367
0.429
0.480
0.590
0.697
0.800
11131131111111111113
ββββ
95617β
956199562095621956229562395624
β95626
β95628
ββββ
95613β
9561595616
β95618
ββββββββββββββ
β95614
ββββββββββββββββββ
ββββββββββββββββββββ
ββββββββββββββββββββ
ββββββββββββββββββββ
GT3OverallLength
Length ofThread
ShankDia.
Std .Pack.
NominalSize NC
UNCNF
UNF
E.D.P. Numbers Dimensions
2
3
4
5
6
8
10
12
1/4
5/16
3/8
7/16
1/2
9/16
5/8
3/4
7/8
1
HIGH PERFORMANCE TAPS
Viper T Series Spiral Pointed
Nodular,Grey
D2,H13 4140,4130 15-401065,1095 15-251035,1045 15-40
6-12
10-15
15-40
15-40
25-50
1010,1018 30-60
Stainless steel (Martensitic) 410,430 10-25Stainless steel (Austentic) 303,304,316 10-25
Work Materials Tapping Speed SFM
Low Carbon SteelMedium Carbon SteelHigh Carbon SteelAlloy SteelDie Steels 10-25Hardened Die Steels (20-40HRC) D2,H13
Stainless steel (PH) up to 35HRC 17-4PH 8-15Titanium Alloy Up to 32HRC 6AL4V
30-60Ductile Cast Irons 80-55-06Cast Irons Nodular,Grey -Copper
40-60Brass, Brass Casting Bronze, Brass Casting
These are general tapping conditions, may be altered by your condition.1.These conditions are for tapping depth 1.5D. In case of deeper thread2.
Thread Depth CoefficientUp to 1.5D 1
1.5Dο½2.5D 0.92.5Dο½3D 0.8
Over 3D 0.7
SFM: Surface Feet per MinutesViper T Spiral Point TAP List7971,7970,7977,7972
Work Materials Tapping Speed SFM
VIPER T Series Tapping SpeedsSFM: Surface Feet per MinutesViper T Spiral Flute TAP List 7981,7980,7987,7982
Magnesium Alloy
you may multiply these values by the coefficient of next table
15-20
20-50
20-50
30-60
Low Carbon SteelMedium Carbon SteelHigh Carbon SteelAlloy SteelDie SteelsHardened Die Steels (20-40HRC) D2,H13
Stainless steel (PH) up to 35HRC 17-4PHTitanium Alloy Up to 32HRC 6AL4V
40-80Ductile Cast Irons 80-55-06Cast Irons 30-60Copper
50-80Brass, Brass CastingBronze, Brass Casting
Magnesium Alloy
4140,4130 20-50
1035,1045 20-50
Stainless steel (Martensitic) 410,430 15-35Stainless steel (Austentic) 303,304,316 15-35
D2,H13
1010,1018 35-75
1065,1095 15-30
38-1515-30
10-20
you may multiply these values by the coefficient of next table
1.2.
*Series being DISCONTINUED, See VTP Series for replacement
Machine Screw & Fractional Sizes
List No. 911 Fractional Sizes
Bright Finish
HIGH SPEED STEEL
202020
181818
161616
14
1313
12
1111
1010
9
8
7
7
6
6
2828
2424
2424
20
2020
18
1818
1616
14
12
12
12
12
12
1116
14
H2H3H5H3H4H2H3H5H3H4H2H3H5H3H4H3H3H3H5H3H5H3H3H3H5H3H5H3H3H3H5H3H5H4H4H4H4H4H4H4H4H4H4H4H4H4
2 1/2
2 23/32
2 15/16
3 5/32
3 3/8
3 19/32
3 13/16
4 1/32
4 1/4
4 11/16
5 1/8
5 7/16
5 3/4
6 1/16
6 3/8
1
1 1/8
1 1/4
1 7/16
1 21/32
1 13/16
2
2 7/32
2 1/2
2 9/16
3
0.255
0.318
0.381
0.323
0.367
0.429
0.480
0.542
0.590
0.697
0.800
0.896
1.021
1.108
1.233
1111333333113333313333313333333133331111111111
Thread
64061640706407664091640946410064109641126412464127641336413964142641546415764169641846419964202642146421764223642326424464247642566425964262642656427464277642866428964295643046431364316643226432564328643316433464337643406434364346
64060640696407564090640936409964108641116412364126641326413864141641536415664168641836419864201642136421664222642316424364246642556425864261642646427364276642856428864294643036431264315643216432464327643306433364336643396434264345
6405964068
64089
6409864107
64122
6413164137
64152
641676418264197
64212
642216423064242
64254
642606426364272
64284
64293643026431164314643206432364326643296433264335643386434164344
4
64646
OverallLength
ThreadLength
ShankDia.
Std.Pack.UNC UNSUNF
E.D.P.
Taper
L911
Plug
L911
Bottom
L911
SizePitch
DiameterLimits
Numberof
Flutes
Dimensions
1/4
5/16
3/8
7/16
1/2
9/16
5/8
11/16
3/4
7/8
1
1 1/8
1 1/4
1 3/8
1 1/2
Order by EDP Number
28
HIGH PERFORMANCE TAPS
Standard Hand Tap T
List No. 913 Machine Screw Size
Bright Finish
HIGH SPEED STEEL
6464
5656
4848
36NS4040
4040
323232
323232
242424
24
8080
7272
6464
5656
4848
4444
4040
3636
323232
28
H1H2H1H2H1H2H1H2H1H2H1H2H1H2H2H1H2H1H2H1H2H1H2H2H3H7H1H2H2H3H7H1H2H2H3H7H2H3H7H3H3
1 5/8
1 11/16
1 3/4
1 13/16
1 7/8
1 15/16
2
2 1/8
2 3/8
5/16
3/8
7/16
1/2
9/16
5/8
11/16
3/4
7/8
15/16
0.141
0.168
0.194
0.220
33333333333333333333333333333333333333333
643626436564368
643746437764383643896439264395
64404
64410644136441964425
6443164434644406444364449644616446764470
64479644976450664509
645196453464543645496456464573645796458564591
6436164364643676437064373643766438264388643916439464397644036440664409644126441864424644276443064433644396444264448644606446664469644726447864496645056450864515645186453364542645486456364572645786458464590
64360
64366
64372
64381643876439064393
64402
64408644116441764423
64429
64438
644476445964465
644776449564504
645176453264541
6456264571
6458364589
2
3
4
OverallLength
ThreadLength
ShankDia.
Std .Pack.
E.D.P. Numbers
Taper
L913
Plug
L913
Bottom
L913
PitchDiameter
Limits
NominalTapSize
Numberof
Flutes
Dimensions
0
1
2
3
4
5
6
8
10
12
Order by EDP Number
Threads
NCUNC
NFUNF
29
Standard Hand Tap
HIGH PERFORMANCE TAPS
T
Dimensions
List No. 921 Fractional Sizes
Plug Style, Bright Finish
HIGH SPEED STEEL
NominalTapSize
PitchDiameter
Limits
Numberof
Flutes
Std.Pack.
NCUNC
NFUNF
E.D.P. Numbers
OverallLength
ThreadLength
ShankDia.
1/4
5/16
3/8
7/16
1/2
9/165/83/4
2020
1818
161616
14
13
121110
28
24
24
20
20
H3H3H3H3H3H3H2H3H5H3H3H3H3H3H3H3H3
23
2
32
3
6705467056670686707867080670926710067102671046711067116671226713067138671426714867150
2 1/2
2 23/32
2 15/16
3 5/32
3 3/8
3 19/323 13/164 1/4
1
1 1/8
1 1/4
1 7/16
1 21/32
1 21/321 13/162
0.255
0.318
0.381
0.323
0.367
0.4290.4800.590
11131331113313111
Order by EDP Number
List No. 969 Fractional SizesSurface Treated
HIGH SPEED STEEL
Size ThreadLimits
Numberof
Flutes
Std.Pack.UNC UNF
E.D.P.Threads
Plug BottomOverallLength
ThreadLength
ShankDia.
Dimensions
1/4
5/16
3/8
7/16
1/2
9/16
5/8
3/4
2020
1818
1616
1414
1313
12
11
10
28
24
24
2020
2020
18
18
16
H3H5H3H3H5H3H3H5H3H3H5H3H5H3H5H3H5H3H3H3H3H3H3
4
7600176003760057600776009760117601376015760177601976021760237602576027760297603176033760357603776039760417604376045
7600276004760067600876010760127601476016760187602076022760247602676028760307603276034760367603876040760427604476046
2 1/2
2 23/32
2 15/16
3 5/32
3 3/8
3 19/32
3 13/16
4 1/4
1
1 1/8
1 1/4
1 7/16
1 21/32
1 21/32
1 13/16
2
0.255
0.318
0.381
0.323
0.367
0.429
0.480
0.590
33333333333333333333333
Threads per inch
0
HIGH PERFORMANCE TAPS
Standard Tap Spiral Pointed
Standard Hand Tap for Cast Iron
Order by EDP Number
List No. 923 Machine Screw Sizes
Plug StyleBright Finish
HIGH SPEED STEEL
NominalTapSize
PitchDiameter
Limits
Numberof
Flutes
Std.Pack.NC
UNCNF
UNF
Threads per inch E.D.P. Numbers
Plug
L923OverallLength
ThreadLength
ShankDia.
Dimensions
0
1
2
3
4
5
6
8
10
12
64
56
48
36NS
40
40
32
32
24
24
80
72
64
56
48
44
40
36
32
H1H2H1H2H1H2H1H2H2H2H2H2H1H2H2H1H2H2H2H3H7H2H2H3H7H2H2H3H7H2H3H7H3
2
672006720267206672086721067212672146721667224672286723467236672386724067248672506725267254672586726067264672686727267274672786728267286672886729067294672966730067304
1 5/8
1 11/16
1 3/4
1 13/16
1 7/8
1 15/16
2
2 1/8
2 3/8
5/16
3/8
7/16
1/2
9/16
11/16
3/4
7/8
15/16
0.141
0.168
0.194
0.220
113311133313313313113311331131131
Order by EDP Number
1
Standard Tap Spiral Pointed
HIGH PERFORMANCE TAPS
5/8
List No. 910Bright Finish
HIGH SPEED STEEL
NominalTap Size
(mm)
MillimeterPitch(mm)
PitchDia. Limits
Numberof Flutes
Std.Pack.PlugTaper Bottom
E.D.P. NumbersThreadLength
OverallLength
ShankDia.
Dimensions
1 3/41 15/1622 1/82 3/82 1/22 23/322 23/322 15/163 3/83 19/323 19/323 13/164 1/324 1/324 15/324 11/164 29/325 1/85 7/16
7/165/811/163/47/8
1
1 1/8
1 1/4
1 21/32
1 13/16
2
2 7/32
2 1/22 9/16
0.1410.1410.1410.1680.1940.2550.3180.3180.3810.3670.4290.4290.4800.5420.5420.6520.6970.7600.8961.021
M2M3M3.5M4M5M6M7M8M10M12M14M14M16M18M18M20M22M24M27M30
0.40.50.60.70.81.01.01.251.51.751.252.02.01.52.52.52.53.03.03.5
D3
D4
D5
D6
D5
D7
D8
D9
3
4
5405654071540745408054095541075411354125541405415554161541675417654182541885420054212542245423954251
5405754072540755408154096541085411454126541415415654162541685417754183541895420154213542255424054252
5405854073540765408254097541095411554127541425415754163541695417854184541905420254214542265424154253
31311331113333333331
Order by EDP Number
List No. 920Bright Finish
HIGH SPEED STEEL
NominalTap Size
(mm)
PitchDiameter
Limits
Numberof
Flutes
Pitch(mm)
E.D.P.Numbers
Std.Pack.Overall
LengthThreadLength
ShankDia.
Dimensions
M2.5M3M4M5M6M8M10M12M14M16
0.450.500.700.801.001.251.501.752.002.00
D3
D4
D5
D6
D7
2
3
57054570555705857061570635706857082570735707657078
1 13/161 15/162 1/82 3/82 1/22 23/322 15/163 3/83 19/323 13/16
1/2 5/8 3/4 7/8
11 1/81 1/41 21/321 21/321 13/16
0.1410.1410.1680.1940.2550.3180.3810.3670.4290.480
1111111111
Order by EDP Number
2
HIGH PERFORMANCE TAPS
Standard Hand Tap
Standard Tap Spiral Pointed
Metric Sizes
Metric Sizes
T
List No. 941 (NPT)
L941NPT
NominalTapSize
ThreadsperInch
Numberof
Flutes
Std.Pack
E.D.P.Number
Size ofSquare
SquareLength
ShankDia.
ThreadLength
OverallLength
Dimensions
1/16 1/8 1/8SS 1/4 3/8 1/2 3/4
11 1/41 1/22
27
18
14
11 1/2
4
5
7
7405174052740537405474055740567405774058740597406074061
2.12602.12602.12602.43702.56303.12603.25203.752044.25204.5
0.6890
0.7520
1.0630
1.3740
1.7520
0.31250.43750.31250.56250.70.68750.90631.1251.31251.51.875
0.37400.37400.37400.43700.50.6260.6890.8110.937011.126
0.23390.32800.23390.42090.53070.51500.67870.84290.98391.12481.4059
11111111111
List No. 943 (NPT)
Dry Seal
L943NPT
Std.Pack.
E.D.P. NumbersShank
Dia.ThreadLength
OverallLength
SquareLength
Size ofSquare
DimensionsNominalTapSize
ThreadPerInch
Numberof
Flutes
1/8 1/4 3/8 1/2 3/4
1
27
18
14
11 1/2
5
740737407574076740777407874079
2.1262.4372.5633.1263.2523.752
0.752
1.063
1.374
1.752
0.43750.56250.70.68750.90631.125
0.37400.43700.50.6260.6890.811
0.32800.42090.53070.51500.67870.8429
111111
List No. 941D (NPTF) Dry Seal
Bright Finish
L941DNPTF
7406274063740647406574066740677406874069
7407174070
74072
L943DNPTF
741737417574176741777417874179
List No. 943D (NPTF)
Bright Finish
33
HIGH PERFORMANCE TAPS
Taper Pipe Tap Straight Fluted
Taper Pipe Tap Interrupted
Order by EDP Number
Order by EDP Number
4
HIGH PERFORMANCE TAPS
Taper Pipe Tap Spiral Fluted
Straight Pipe Tap Straight Fluted
List No. 947 (NPT)
Surface Treated
L947NPT
Std.Pack.
E.D.P. NumbersShank
Dia.ThreadLength
OverallLength
SquareLength
Size ofSquare
DimensionsNominalTapSize
ThreadPerInch
Numberof
Flutes
1/16 1/8 1/8SS 1/4 3/8 1/2 3/4
1
27
18
14
11 1/2
4
5
8405184052840538405484055840568405784058
2.1262.1262.1262.4372.5633.1263.2523.752
0.689
0.752
1.063
1.374
1.752
0.31250.43750.31250.56250.70.68750.90631.125
0.3740.3740.3740.4370.50.6260.6890.811
0.23390.32800.23390.42090.53070.51500.67870.8429
11111111
L947DNPTF
8406284063840648406584066840678406884069
List No. 947D (NPTF) Dry Seal
PREMIUM TYPE STEEL
List No. 945 (NPS)
Bright Finish
L941NPS
NominalTapSize
ThreadsperInch
Numberof
Flutes
Std.Pack
E.D.P. NumbersSize ofSquare
SquareLength
ShankDia.
ThreadLength
OverallLength
Dimensions
1/8 1/4 3/8 1/2 3/4
1
27
18
14
11 1/2
4
5
740837408574086740877408874089
2.1262.4372.5633.1263.2523.752
0.752
1.063
1.374
1.752
0.43750.56250.70.68750.90631.125
0.37400.43700.50.6260.6890.811
0.32800.42090.53070.51500.67870.8429
111111
List No. 945D (NPSF) Dry Seal
L941DNPSF7409074092740937409474095
HIGH SPEED STEEL
Order by EDP Number
Order by EDP Number
STRAIGHT
35
Taper Pipe Tap Short Projection
HIGH PERFORMANCE TAPS
List No. 959 (NPT)Dry Seal
L959NPT
Std.Pack.
E.D.P. NumbersShank
Dia.ThreadLength
OverallLength
SquareLength
Size ofSquare
DimensionsNominalTapSize
ThreadPerInch
Numberof
Flutes
1/8 1/4 3/8 1/2 3/4
1
2718181414
11 1/2
4
5
741007410274103741047410574106
2.1262.4372.5633.1263.2523.752
0.752
1.063
1.374
1.752
0.43750.56250.70.68750.90631.125
0.3740.4370.50.6260.6890.811
0.32800.42090.53070.51500.67870.8429
111111
L959DNPTF
741077410974110741117411274113
List No. 959D (NPTF)HIGH SPEED STEEL
Bright Finish
Projection*
.241
.361
.464
.565
* Projection Tolerance: 1/8β - 3/4β ..... Β± 1/16β1β ..... Β± 3/32β
Taper Pipe Tap 6β Extension
List No. 957 (NPT)HIGH SPEED STEEL
L957NPT
NominalTapSize
ThreadsperInch
Numberof
Flutes
Std.Pack
E.D.P. NumbersSize ofSquare
SquareLength
ShankDia.
ThreadLength
OverallLength
Dimensions
1/16 1/8 1/4 3/8 1/2 3/4
27
18
14
4
5
741207412174123741247412574126
6
0.6890.752
1.063
1.374
0.31250.43750.56250.70.68750.9063
0.37400.37400.4370.50.6260.689
0.23390.32800.42090.53070.51500.6787
111111
1 11 1/2 74127 1.752 1.125 0.811 0.8429 1
Order by EDP Number
Order by EDP Number
Bright Finish
Standard TapsTapping Speed
SFM
40-8015-4040-50
3020-3020-2530-4515-2510-1515-4515-7545-7515-25
5035203-7
20-155-10
3
40-6010-25
50150
AnnealedTemperedAnnealedTemperedAnnealedas CastAnnealedTemperedTreatedAnnealedTemperedAnnealedAnnealedAnnealedAnnealedNormalizedTemperedAnnealedMaragedStress Relieved
AnnealedAnnealed
Die Cast
(Steels Cont.) Carbon Steel, Plain
Cast Carbon
Cast, Corrosion Resistant Heat Resistant Low Alloy
Precipitation Hardening Stainless
Free Machining Tool Steels, High Speed Water Hardening Ultra High Strength Steels
Maraging Steels
Tantalum AlloysTitanium Alloys Commercial Pure Alpha & Alpha Beta Alloys
Tungsten Alloys, Pressed & SinteredZinc Alloys
MaterialTapping Speed
SFM
90-10060-10040-6040-605-10
10-155-106030
15-2080
35-6060
25-5017520502025255050
40-6015-35
10
Cobalt BaseIron BaseNickel BaseAnnealedas CastTemperedAnnealedas Cast
Heat TreatedAnnealed
Stress RelievedAnnealedAnnealed
Aluminum AlloysBrassBronzeCopperHigh Temperature Alloys
Iron, Ductile
Gray
Malleable
Magnesium AlloysManganeseMolybdenum AlloysMonelNickel AlloysPlastics, Reinforced Thermoplastics Thermosetting Plastics
Steels, Alloys, Annealed or Cold Drawn Quenched & Tempered Armor Plate
Material
36
TECHNICAL REFERENCE / TAPS
Tapping Speeds
.5 D9 0. 5 0.0
H Limits TableFractional and Machine Screw Types
D Limits Table Metric Taps
H1 0.0000 0.0005 H2 0.0005 0.0010 H3 0.0010 0.0015 H4 0.0015 0.0020 H5 0.0020 0.0025 H6 0.0025 0.0030 H7 0.0030 0.0035 H8 0.0035 0.0040 H9 0.0040 0.0045
H10 0.0045 0.0050 H11 0.0050 0.0055 H12 0.0055 0.0060
Class MIN MAXM2X0.4 D3 0.0009 0.0015 M2.5X0.45 D3 0.0009 0.0015 M3X0.5 D3 0.0009 0.0015 M3.5X0.6 D4 0.0012 0.0020 M4X0.7 D4 0.0012 0.0020 M5X0.8 D4 0.0012 0.0020 M6X1 D5 0.0015 0.0025 M7X1 D5 0.0015 0.0025 M8X1 D5 0.0015 0.0025 M8X1.25 D5 0.0013 0.0025 M10X1.25 D5 0.0013 0.0025 M10X1.5 D6 0.0018 0.0030 M12X1.25 D5 0.0013 0.0025 M12X1.75 D6 0.0018 0.0030 M14X1.5 D6 0.0018 0.0030 M14X2 D7 0.0019 0.0035 M16X1.5 D6 0.0018 0.0030 M16X2.0 D7 0.0019 0.0035 M18X1.50 D6 0.0018 0.0030 M18X2.5 D7 0.0019 0.0035 M20X2.5 D7 0.0019 0.0035 M22X2.5 D7 0.0019 0.0035M24X3.0 D8 0.0024 0.0040M27X3.0 D8 0.0024 0.0040M30X3 002 045
Tap Size D Class MIN MAX
Tap Tolerance Table
Standards & Dimensions
Standard System of Marking
GeneralTaps, dies, and other threading tools will be markedwith the nominal size, number of threads per inch, andthe proper symbol to identify the thread form. Thesesymbols are in agreement with the ANSIB94.9 1979Standard on Nomen-clature, Definitions and LetterSymbols for Screw Threads.
Symbols used for American Threads are:Symbol Reference
NC American National Coarse Thread Series
NF American National Fine Thread Series
NEF American National Extra Fine Thread Series
N American National 8,12 and 16 Thread Series (8N, 12N, i6N)
NH American (National) Hose Coupling and Fire Hose Coupling Threads
NM National Miniature Screw Thread
NGO American (National) Gas Outlet Thread
NS American Special Thread
NPT American (National) Taper Pipe Thread
NPTF Dryseal American (National) Taper Pipe Thread
ANPT Military Aeronautical Pipe Thread Specification MIL-P-71 05
NPS American (National) Straight Pipe Thread
NPSC American (National) Straight Pipe Thread in Pipe Couplings
NPSF Dryseal American (National) Fuel Internal Straight Pipe Thread
NPSH American (Standard) Straight Pipe Thread for Hose Couplings and Nipples
NPSI Dryseal American (National) Intermediate Internal Straight Pipe Thread
NPSL American (National) Internal Straight Pipe Thread for Locknut Connections (Loose Fitting Mechanical Joints)
NPSM American (National) Internal Straight Pipe Thread for Mechanical Joints (Free Fitting)
NPTR American (National) Internal Taper Pipe Thread for Railing Joints (Mechanical Joints)
AMO American Standard Microscope Objective Thread
ACME C Acme Screw Thread β Centralizing Type
ACME G Acme Screw Thread β General Purpose Type
STUBACME Stub Acme Threads
NBUTT National Buttress Screw Thread
V A 60Β° "V" Thread with Truncated Crests and Roots. The Theoretical "V" Form is usually flatted several thousandths of an inch to the userβs specifications.
SB Manufacturers Stovebolt Standard Thread
STI Special Threads for Helical Coil Wire Screw Thread Inserts.
Group Thread Taps - Limit NumbersAll standard Ground Thread Taps will be marked withthe letter G to designate Ground Thread. The letter Gwill be followed by the letter H to designate abovebasic (L below basic) and a numeral to designate thePitch Diameter limits.
Example: GH3 indicates a Group thread Tap with PitchDiameter limits .0010 to .0015 over basic.
Pitch Diameter limits for Taps to 1" diameter inclusive.L1 = Basic to Basic minus .0005H1 = Basic to Basic plus .0005H2 = Basic plus .0005 to Basic plus .0010H3 = Basic plus .0010 to Basic plus .0015H4 = Basic plus .0015 to Basic plus .0020H5 = Basic plus .0020 to Basic plus .0025H6 = Basic plus .0025 to Basic plus .0030
Pitch Diameter limits for Taps over 1" diameter to 1 1/2"diameter inclusive.
H4 = Basic plus .0010 to Basic plus .0020
American National 8, 12, 16 and NEF Thread Series
National 8 pitch Series 1" to 2 1/4" by 1/8ths 21/4" to 6" by 1/4ths
National 12 pitch Series 1/2" to 1 1/2" 1/16ths1 1/2" to 4" by 1/8ths4" to 6" by 1/4thS
National 16 pitch Series 3/4" to 2 1/2" by 1/16ths2 1/2" to 4" by 1/8ths4" to 6" by 1/4ths
National Extra Fine Thread Series
#12 β321/4" β325/16" β323/8" β327/16" β281/2" β289/16" β245/8" β2411/16" β243/4" β2013/16" β207/8" β2015/16" β201" β20
1 1/6" β181 1/16" β181 1/18" β181 3/16" β181 1/4" β181 5/16" β181 3/8" β181 7/16" β181 1/2" β181 9/16" β181 5/8" β181 11/16" β181 3/4" β162" β16
37
TECHNICAL REFERENCE / TAPS
Size ofSquare
ShankDiameter
D
Tap Dimensions β InchesSquareLength
C
ThreadLength
B
OverallLength
A
Style*
NominalMetric
DiameterMill.
NominalFractionalDiameter
Inches
MachineScrewSizeNo.To (lncl)Over
Nominal DiameterRange - Inches
Standard Tap Blank Dimensions
THREAD LENGTHINCL. CHAMFERC
D D D
AB
C
AB
C
AB
THREAD LENGTHINCL. CHAMFER
THREAD LENGTHINCL. CHAMFER
Table 302 - General Dimensions
.052
.065
.078
.091
.104
.117
.130
.145
.171
.197
.223
.260
.323
.385
.448
.510
.573
.635
.709
.760
.823
.885
.9481.0101.0731.1351.1981.2601.3231.3851.4481.5101.6351.7601.8852.0102.1352.2602.3852.5102.6352.7602.8853.0103.1353.2603.3853.5103.6353.7603.885
.065
.078
.091
.104
.117
.130
.145
.171
.197
.223
.260
.323
.385
.448
.510
.573
.635
.709
.760
.823
.885
.9481.0101.0731.1351.1981.2601.3231.3851.4481.5101.6351.7601.8852.0102.1352.2602.3852.5102.6352.7602.8853.0103.1353.2603.3853.5103.6353.7603.8854.010
01234568
101214
1/16
3/32
1/8
5/323/167/321/45/163/87/161/29/165/811/163/413/167/815/16
11 1/161 1/81 3/161 1/41 5/161 3/81 7/161 1/21 5/81 3/41 7/82 2 1/82 1/42 3/82 1/22 5/82 3/42 7/833 1/83 1/4 3 3/83 1/23 5/83 3/43 7/84
M1.6M1.8M2,MZ2M2.5
M3, M3.15M3.5M4M4.5, M5
M6, M6.3M7, M8M10
MI2 M12.5M14M16M18
M20M22M24M25M27
M30
M33
M36
M39M42
M48
M56
M64
M72
M80
M90
M100
111111111122233333333333333333333333333333333333333
1 5/81 11/161 3/41 13/161 7/81 15/1622 1/82 3/82 3/82 1/22 23/322 15/163 5/323 3/83 19/323 13/164 1/324 1/44 15/324 11/164 29/325 1/85 1/85 7/165 7/165 3/45 3/46 1/166 1/166 3/86 11/1677 5/167 5/888 1/48 1/28 3/48 3/49 1/49 1/49 3/49 3/4
101010 1/410 1/410 1/210 1/210 3/4
5/163/87/161/29/165/811/163/47/815/16
11 1/81 1/41 7/161 21/321 21/321 13/161 13/16222 7/322 7/322 1/22 1/22 9/162 9/162 9/162 9/163333 3/163 3/163 9/163 9/163 9/163 9/16444444 9/164 9/164 9/164 9/164 15/164 15/165 5/165 5/165 5/16
3/163/163/163/163/163/163/161/41/49/325/163/87/1613/327/161/29/165/811/1611/163/43/413/167/87/8
111 1/161 1/161 1/81 1/81 1/81 1/41 1/41 3/81 3/81 7/161 7/161 1/21 1/21 9/161 9/161 5/81 5/8 1 3/41 3/4222 1/82 1/82 1/4
.141
.141
.141
.141
.141
.141
.141
.168
.194
.220
.255
.318
.381
.323
.367
.429
.480
.542
.590
.652
.697
.760
.800
.896
.8961.0211.0211.1081.1081.2331.2331.3051.4301.5191.6441.7691.8942.0192.1002.2252.3502.4752.5432.6682.7932.8833.0083.1333.2173.3423.467
.110
.110
.110
.110
.110
.110
.110
.131
.152
.165
.191
.238
.286
.242
.275
.322
.360
.406
.442
.489
.523
.570
.600
.672
.672
.766
.766
.831
.831
.925
.925
.9791.0721.1391.2331.3271.4201.5141.5751.6691.7621.8561.9072.0012.0952.1622.2562.3502.4132.5062.600
* Styles shown are for ground thread taps
STYLE 1 STYLE 2 STYLE 3
38
TECHNICAL REFERENCE / TAPS
Tap Recommendation for Classes 2B & 3B Unified Inch Screw Threads
The above recommended taps normally produce the Class of Thread indicated average materials when used with reasonable care. However,if the tap specified does not give a satisfactory gauge fit in the work, a choice of some other limit tap will be necessary.
011223344556688
101012121/41/45/165/163/83/87/167/161/21/29/169/165/85/83/43/47/87/8
111
1 1/81 1/81 1/41 1/41 3/81 3/81 1/21 1/2
β64β
56β
48β
40β
40β
32β
32β
24β
24β
20β
18β
16β
14β
13β
12β
11β
10β9β8β
7β7β6β6β
80β
72β
64β
56β
48β
44β
40β
36β
32β
28β
28β
24β
24β
20β
20β
18β
18β
16β
14β
12
β12β
12β
12β
12
H2H2H2H2H2H2H2H2H2H2H2H3H2H3H2H3H3H3H3H5H4H5H4H5H4H5H5H5H5H5H5H5H5H5H5H6H6H6H6H6H8H6H8H6H8H6H8H6
H1H1H1H1H1H1H1H2H1H2H1H2H2H2H2H3H2H3H3H3H3H3H3H3H3H3H3H3H3H3H3H3H3H5H3H4H4H4H4H4H4H4H4H4H4H4H4H4
.0519
.0629
.0640
.0744
.0759
.0855
.0874
.0958
.0985
.1088
.1102
.1177
.1218
.1437
.1460
.1629
.1697
.1889
.1928
.2175
.2268
.2764
.2854
.3344
.3479
.3911
.4050
.4500
.4675
.5084
.5264
.5660
.5889
.6850
.7094
.8028
.8286
.9188
.9459
.95361.03321.07091.15721.19591.26671.32091.39171.4459
.0542
.0655
.0665
.0772
.0786
.0885
.0902
.0991
.1016
.1121
.1134
.1214
.1252
.1475
.1496
.1672
.1736
.1933
.1970
.2223
.2311
.2817
.2902
.3401
.3528
.3972
.4104
.4565
.4731
.5152
.5323
.5732
.5949
.6927
.7159
.8110
.8356
.9276
.9535
.96091.04161.07871.16681.20391.27711.32911.40221.4542
.0536
.0648
.0659
.0765
.0779
.0877
.0895
.0982
.1008
.1113
.1126
.1204
.1243
.1465
.1487
.1661
.1726
.1922
.1959
.2211
.2300
.2803
.2890
.3387
.3516
.3957
.4091
.4548
.4717
.5135
.5308
.5714
.5934
.6907
.7143
.8089
.8339
.9254
.9516
.95901.03931.07681.16441.20191.27451.32701.39961.4522
Size
ThreadsPer Inch
NCUNC
NFUNF
Class2B
Class3B
Min. AllClasses(BASIC)
Max.Class
2B
Max.Class
3B
Recommended TapLimits
Internal ThreadPitch Diameter Units
14 NS
39
TECHNICAL REFERENCE / TAPS
The following tables show the Theoretical Percentage of Thread obtained from stock sizes of drills and also theProbable Percentage after allowance for oversize drilling.
Formula for Obtaining Tap Drill Sizes(Select nearest commercial stock drill)
TapDrill
Decimal Tap Equiv. of
0-80
1-64
1-72
2-56
2-64
3-48
3-56
4-40
4-48
5-40
5-44
6-32
6-40
563/64545353
1/16515049504948
5/64474645464544444342
3/3242
3/3241403938373837363736
7/64353433343332
.0465
.0469
.0550
.0595
.0595
.0625
.0670
.0700
.0730
.0700
.0730
.0760
.0781
.0785
.0810
.0820
.0810
.0820
.0860
.0860
.0890
.0935
.0938
.0935
.0938
.0960
.0980
.0995
.1015
.1040
.1015
.1040
.1065
.1040
.1065
.1094
.1100
.1110
.1130
.1110
.1130
.1160
.0480
.0484
.0565
.0610
.0610
.0640
.0687
.0717
.0747
.0717
.0747
.0779
.0800
.0804
.0829
.0839
.0829
.0839
.0879
.0880
.0910
.0955
.0958
.0955
.0958
.0980
.1003
.1018
.1038
.1063
.1038
.1063
.1088
.1063
.1091
.1120
.1126
.1136
.1156
.1136
.1156
.1186
747181596750746249705678706960566965487465555061605276716558726355787164636055756960
8-32
8-36
10-24
10-32
12-24
12-28
1/4-20
1/4-28
5/16-18
5/16-24
29282928
9/642726252423
5/3222
5/3222212019
11/641716151416151413
3/16987
13/646543
7/322FG
17/64HHI
.1360
.1405
.1360
.1405
.1406
.1440
.1470
.1495
.1520
.1540
.1563
.1570
.1563
.1570
.1590
.1610
.1660
.1719
.1730
.1770
.1800
.1820
.1770
.1800
.1820
.1850
.1875
.1960
.1990
.2010
.2031
.2040
.2055
.2090
.2130
.2188
.2210
.2570
.2610
.2656
.2660
.2660
.2720
.1389
.1434
.1389
.1434
.1435
.1472
.1502
.1527
.1552
.1572
.1595
.1602
.1595
.1602
.1622
.1642
.1692
.1754
.1765
.1805
.1835
.1855
.1805
.1835
.1855
.1885
.1910
.1998
.2028
.2048
.2069
.2078
.2093
.2128
.2168
.2226
.2248
.2608
.2651
.2697
.2701
.2701
.2761
62517057577974696461565575736864517573666056777066595477737066656357725955726659597867
3/8-16
3/8-24
7/16-14
7/16-20
1/2-13
1/2-209/16-12
9/16-18
5/8-11
5/8-18
3/4-10
3/4-167/8-9
7/8-14
1β-8
1β-12
1β-14
5/16OP
21/64QRT
23/64U
3/18VW
25/64X
27/647/16
29/6415/3231/64
1/233/6417/3235/649/16
37/6441/6421/3211/1649/6425/3251/6413/1655/64
7/857/6429/3229/3259/6415/1659/6415/16
.3125
.3160
.3230
.3281
.3320
.3390
.3580
.3594
.3680
.3750
.3770
.3860
.3906
.3970
.4219
.4375
.4531
.4688
.4844
.5000
.5156
.5313
.5469
.5625
.5781
.6406
.6563
.6875
.7656
.7812
.7969
.8125
.8594
.8750
.8906
.9063
.9063
.9219
.9375
.9219
.9375
.3160
.3204
.3274
.3325
.3364
.3434
.3626
.3640
.3726
.3796
.3816
.3906
.3952
.4016
.4216
.4422
.4578
.4736
.4892
.5048
.5204
.5362
.5518
.5674
.5831
.6456
.6613
.6925
.7708
.7864
.8021
.8177
.8653
.8809
.8965
.9122
.9123
.9279
.9435
.9279
.9435
7268597971588179706260726555735865826880587562805880687172617962837364548167527861
Tap Drill
0
TECHNICAL REFERENCE / TAPS
Tap Drill Sizes
Probable HoleSize
Percent of
Thread
TapDrill
Decimal Tap Equiv. of
Tap Drill
Probable HoleSize
Percent of
Thread
TapDrill
Decimal Tap Equiv. of
Tap Drill
Probable HoleSize
Percent of
Thread
Percent of Thread = Basic thread OD. x Pre-Tapping Diameter x 100%2 x (Basic Height of Thread)
β’ Pre-Tapping Diameter for Cutting Taps
Pre-tapping Diameter = Basic thread OD. β .01299 x Percent of ThreadNo. of threads per inch
β’ Pre-Tapping Diameter for Roll Forming Taps
Pre-tapping Diameter = Basic thread OD. β .0068 x Percent of ThreadNo. of threads per inch
For Thread Forming Taps
011223344556688
101012121/41/45/165/163/83/87/167/161/21/29/169/165/85/83/43/4
β64β56β48β40β40β32β32β24β24β20β18β16β14β13β12β11β10β
80β72β64β56β48β44β40β36β32β28β28β24β24β20β20β18β18β16
.0536
.0650
.0659
.0769
.0780
.0884
.0899
.0993
.1014
.1123
.1134
.1221
.1253
.1481
.1498
.1688
.1741
.1948
.1978
.2245
.2318
.2842
.2912
.3431
.3537
.4011
.4120
.4608
.4745
.5200
.5342
.5787
.5967
.6990
.7181
1.35mm1.65mm1.65mm1.95mm5/642.25mm432.5mm3834332.1mm1/83.75mm25
β17105.0mm5.7mm
β7.2mm7.4mm11/329.0mm
βZ
βββ
13.5mm37/6419/32
β23/32
.0531
.0650
.0650
.0768
.0781
.0886
.0890
.0984
.1015
.1110
.1130
.1220
.1250
.1476
.1495β
.1730
.1935
.1968
.2244β
.2835
.2913
.3437
.3543βββββ
.5315
.5781
.5937β
.7187
.0540
.0655
.0663
.0774
.0785
.0890
.0904
.1000
.1020
.1130
.1141
.1230
.1260
.1490
.1507
.1700
.1750
.1960
.1989
.2260
.2329
.2861
.2927
.3452
.3552
.4035
.4137
.4634
.4762
.5229
.5361
.5817
.5986
.7024
.7202
1.35mm1.65mm
β1.95mm4743
β3938332.9mm3.1mm3.2mm
β3.8mm18
β98
β5.9mm7.25mm
β8.75mm9.0mmY10.5mm
ββββ
37/64ββ
23/32
.0531
.0650β
.0768
.0785
.0890β
.0995
.1015
.1130
.1142
.1220
.1260β
.1496
.1695β
.1960
.1990β
.2323
.2854β
.3445
.3543ββββββ
.5781ββ
.7187
.0545
.0661
.0669
.0781
.0791
.0898
.0911
.1010
.1028
.1140
.1150
.1243
.1270
.1503
.1518
.1717
.1763
.1977
.2003
.2280
.2343
.2879
.2941
.3474
.3566
.4059
.4154
.4660
.4779
.5257
.5380
.5848
.6004
.7058
.7224
ββ
1.7mm3/642.0mm432.3mm392.6mm332.9mm
β3.2mm252411/64
β5.0mm81A7.3mmMS
β13/32
βββββββ
45/64β
ββ
.0669
.0781
.0787
.0890
.0906
.0995
.1024
.1130
.1142β
.1260
.1495
.1520
.1719β
.1968
.1990
.2280
.2340
.2874
.2950
.3480βββββββββ
.7031β
.0549
.0666
.0673
.0787
.0796
.0905
.0917
.1018
.1035
.1148
.1157
.1252
.1278
.1512
.1526
.1729
.1772
.1989
.2014
.2295
.2354
.2898
.2955
.3495
.3580
.4084
.4171
.4686
.4796
.5285
.5398
.5879
.6023
.7092
.7245
54β
51472.0mm2.3mm2.3mm382.6mm2.9mm
β1/83.25mm3.8mm2411/641687115/64L7.5mm8.9mmT
ββ
15/32βββββ
18.0mmβ
.0550β
.0670
.0785
.0787
.0906
.0906
.1015
.1024
.1142β
.1250
.1280
.1496
.1520
.1719
.1770
.1990
.2010
.2280
.2344
.2900
.2953
.3504
.3580ββββββββ
.7087β
NominalSize
Threadsper Inch
75% Thread 70% Thread 65% Thread 60% Thread
NCUNC
NFUNF
Theor.HoleCoreSize
NearestDrillSize
Dec.Equiv.
1
TECHNICAL REFERENCE / TAPS
Tap Drill Sizes
Theor.HoleCoreSize
NearestDrillSize
Dec.Equiv.
Theor.HoleCoreSize
NearestDrillSize
Dec.Equiv.
Theor.HoleCoreSize
NearestDrillSize
Dec.Equiv.
Theoretical Core Hole Size
Max.Min.
5H Class 6H Class
Inches
Pitch Suggested Taps
mm Inches mm Inches mm33.54568
1012141620
0.50.60.70.811.251.51.75222.5
.1071
.1244
.1417
.1791
.2142
.2870
.3602
.4335
.5067
.5854
.7315
2.723.163.604.555.447.299.15
11.0112.8714.8718.58
.1094
.1268
.1445
.1823
.2177
.2913
.3602
.4368
.5126
.5913
.7386
2.793.223.674.635.537.409.27
11.1413.0215.0218.76
.1098
.1276
.1453
.1831
.2185
.2925
.3665
.4402
.5142
.5929
.7409
2.793.243.694.655.557.439.31
11.1813.0615.0618.82
H5H5H6H6H7H8H9H10H11H11H11
H6H7H7H8H9H10H11H12H13H13H14
Nom.Dia
For Cutting Taps
M2M3M3.5M4M5M6M7M8
M10
M12
M14
0.40.50.60.70.8111.2511.51.251.751.2521.25
1.572.462.853.244.134.925.926.656.928.388.65
10.1110.6511.8012.65
1.612.512.923.324.225.036.036.787.038.548.78
10.3010.7812.1012.78
1.652.572.983.394.315.136.136.927.138.708.9210.5010.9212.3012.92
1.702.623.053.474.395.246.247.057.248.869.0510.7011.0512.5013.05
1.567~1.6792.459~2.5992.850~3.0103.242~3.4224.134~4.3344.917~5.1535.917~6.1536.647~6.9126.917~7.1538.376~8.6768.647~8.912
10.106~10.44110.647~10.91211.835~12.21012.647~19.912
NominalSize
PitchMinor Dia. of
Internal Thread
Percentage of Thread EngagementHole Diameter
100% 90% 80% 70%
Unit : mm
For Thread Forming Taps Unit : mm
Note:1.Determine hole diameter by tapping test. The dimensions in this table are
for reference only.
2
TECHNICAL REFERENCE / TAPS
Tap Drill Sizes (Metric)
M16
M18
M20
M22
M24
M27M30
21.52.51.52.51.52.51.531.533.5
NominalSize
PitchMinor Dia. of
Internal Thread
Percentage of Thread EngagementHole Diameter
100% 90% 80% 70%13.8014.3815.3016.3817.3018.3819.3020.3820.8022.3823.8026.20
14.1014.5415.6016.5417.6018.5419.6020.5421.1022.5424.1026.60
14.3014.7015.8016.7017.8018.7019.8020.7021.4022.7024.4027.00
14.5014.8616.1016.8618.1018.8620.1020.8621.7022.8624.7027.30
13.835~14.21014.376~14.67615.294~15.74416.376~16.67617.294~17.74418.376~18.67619.264~19.74420.367~20.67620.752~21.25222.376~22.67623.752~24.25226.211~26.711
NominalSize
PitchPercentage of Thread Engagement
Hole Diameter
100% 90% 80% 70%
NominalSize
PitchPercentage of Thread Engagement
Hole Diameter
100% 90% 80% 70%M2M2.2M2.5M3M3.5M4M4.5M5
M7M8
0.40.450.450.50.60.70.750.8111.251
M6
1.771.942.242.723.163.604.074.555.436.437.297.43
1.801.972.272.743.193.644.124.595.496.497.367.49
1.822.002.302.773.233.684.164.645.556.557.437.55
1.842.022.322.803.263.724.204.685.606.607.507.60
M10
M12
M14
M16
M20
1.51.251.751.2521.521.52.51.52.51.5
M18
9.159.2911.0111.2912.8713.1514.8715.1516.5817.1518.5819.15
9.239.3611.1111.3612.9813.2314.9815.2316.7217.2318.7219.23
9.329.4311.2111.4313.0913.3215.0915.3216.8717.3218.8719.32
9.409.5011.3111.5013.2113.4015.2115.4017.0117.4019.0119.40
NominalPipeSize
1/161/81/43/81/23/4
11 1/41 1/22
27271818141411-1/211-1/211-1/211-1/2
DR
7/1637/6445/6459/64
1 5/321 1/21 47/642 7/32
.2460
.3390
.4375
.5781
.7031
.92191.15621.50001.73442.2188
15/6421/6427/649/1611/1657/64
1 1/81 15/321 45/642 3/16
.2344
.3281
.4219
.5625
.6875
.89061.12501.46881.70312.1875
1/411/327/1637/6423/3259/64
1 5/32
.2500
.3438
.4375
.5781
.7188
.92181.1562
ThreadsPerInch
NPTβNPTF NPTβNPTFβANPT NPSβNPSF(When Drilled Only) (When Taper Reamed)
Dr. Size Dec. Equiv. Dr. Size Dec. Equiv. Dr. Size Dec. Equiv.
For Pipe Taps
2018.08.MT
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