This unique bolt securing system uses tensionto make the bolt self-locking

2

The key is the difference in angles. Here

you see what happens when a nut

attempts to loosen. The pair of washers

expand more than the corresponding

pitch of the thread. Nord-Lock® washers

positively lock the fastener in a joint

which is subjected to any vibration or

dynamic loads.

The small details provide the best locking effectNord-Lock® is a pair of washers with a wedge-locking action meeting DIN 25 201 which is a unique method using tension instead of friction. The rise of the cams between the two Nord-Lock® washers is greater than the pitch of the bolt. In addition, there are radial teeth on the opposite side. When the bolt and/or nut is tightened, the teeth grip and seat the mating surfaces.The Nord-Lock® washer is locked in place, allowing movement only across the face of the cams. The tension created makes the bolt/nut self-locking so it cannot move.

Nord-Lock® has cams on one side with a greater rise than the pitch of the bolt. In addition, Nord-Lock® has radial teeth on the opposite side. The washers are installed in pairs, cam face to cam face.

Security test

A quick test of the locking function is to

tighten and loosen the fastener. When

un-tightening, the cam overriding ”click”

effect must occur. The locking effect

can never be judged by measuring

the break-away-torque since the

friction is lower between the cam faces.

The break-away torque is less than the

tightening torque.

Temperatures

The Nord-Lock® washers have the same

temperature characteristics as the bolts

and nuts of corresponding material

quality.

Steel starts to degrade at temperatures

over 200°C and stainless steel starts to

degrade at temperatures over 500°C

as do the nuts/bolts.Where are they used?

• Construction equipment• Automotive industry• Agriculture equipment• Off-road• Manufacturing equipment• Mining• Oil industry• Railroad equipment• Trucking industry• Utilities• Power plants• Process industries

3

Nord-Lock® maintains the bolt tension with the highest possible safety

Amplitude: + 0,3 mm/+ 0,5 mm

Frequency: 40 Hz

Clamp length: 25 mm - 50 mm

Hardnessof mating material: HRA 63–65

The Nord-Lock® washers have been used in various industries for many years with excellent results.

Vibration test with tab washer and locking wire

Tab washer

Locking wire

of preload which is caused mainly by

settlement in the thread.

Even after moderate tightening the bolt

is safely locked when using Nord-Lock®.

Recommended torque figures (see

page 7) are based on tests in our own

laboratory with calibrated torque

transmitters and load cells.

Junker vibration test

One method for testing the security of a

bolted joint is the Junker-vibration test.

The preload (bolt tension) is measured

by a load cell and vibrating motions are

generated radially through the bolt.

Nord-Lock® together with a standard nut

achieves a locking that is superior to other

locking hardware e.g. nylon-inserted nuts.

Bolts that are locked by friction in

the thread lose most of their preload

through vibrations while those locked

with Nord-Lock® present a minor loss

Junker vibration test diagrams

Time [seconds]

Regular nut M8 on bolt with Nord-Lock®

at 70% of yield point

Regular nut M8 on bolt, clamp length50 mm

Nylon-inserted nut

Split ring

Regular nut M8 on bolt

Regular nut M8 on bolt with Nord-Lock®

at 25% of yield point

Cla

mp load

[kN

]

UntighteningVibration testbolt with clamp length 25 mm

Time [seconds]

Cla

mp load

[kN

]

Vibration test

Locking wire

Tab washer

4

Examples of Nord-Lock® used in combination with long holes.From top picture:• Flange nut with NL sp (large

outer diameter)• Regular nut with NL sp (large

outer diameter)• Regular nut with NL standard

(regular outer diameter)

Vibration test with long holes

Vibration test with lubricated bolt on painted surface

Painted surface after use of Nord-Lock® with standard diameter.

Painted surface after use of Nord-Lock® with large outer diameter.

Painted surfaces

When tightening towards a painted

surface sliding may occur towards the

paint if there is a thick and soft layer of

paint. If the paint is hard, sliding will occur

between the upper washer and bolt

head/nut. In both cases there will be a

positive locking effect since sliding in off-

torque direction will be on the cam faces

of the washers where the friction is lower

than on the serrated surfaces.

Long holes and softer materials

In order to cover as much surface as

possible it is recommended to use

flanged nuts and bolts in combination

with Nord-Lock® washers with a large

outer diameter.

Normally a standard bolt and standard

Nord-Lock® washer will work, however,

it is recommended to make a tightening

test to determine the depths of the

impressions around the hole area.

Cla

mp load

[kN

]

Time [seconds]

Vibration testlong holes

Time [seconds]

Flange nut with Nord-Lock® sp (large outer diameter)

Regular nut with Nord-Lock® sp (large outer diameter)

Regular nut with Nord-Lock® standard (standard outer diameter)

Regular nut M8 on bolt with Nord-Lock®

lubricated, reused 9 times

Regular nut M8 on bolt with Nord-Lock®

first application

Cla

mp load

[kN

]

UntighteningVibration test

Nord-Lock® on painted surface (t = 80 μm)

5

Materials Range Electro zinc Dacromet Non-coated ISO2081 (ISO/Rfe/Zn8c2C)

Standard steel NL3–NL42 HRA 75 ±4% HRA 73 ±4%

(through hardened) NL45–NL130 HRA 72 ±4%

Stainless steel NL3 ss–NL80 ss HV0,05 > 520

(A4)

In combination with 8.8 bolt/nut Nord-

Lock® can be reused up to 5 times if the

washers are lubricated before re-assembly.

On high-grade and stainless steel, bolt/

nut reuse is not recommended.

Corrosion resistance

Corrosion test according to SS-ISO 9227

Electro zinc yellow chromate after 144 hours Dacromet® after 400 hours

Laboratory tests

Test report no. 375-130-91 carried

out by the German TÜV confirms that

after two million cycles the tension

is maintained. An inspection of the

washers showed that Nord-Lock® could

be used safely.

The Nord-Lock® manufacturer will support

Available in

• Yellow zinc chromate (standard)• Dacromet® coated• Stainless steel SS 2343 (�AISI 316)• Large and small outside diameter• Pre-assembled

Available in a variety of sizes

Steel: M3–M130, #5–5”Stainless steel: M3–M80, #5–31/8”

Dimension list

For our current dimension list, please visit www.nord-lock.com.

you in most cases as far as torque/load

ratios and security tests during severe

vibration in their simulators.

Please contact your local Nord-Lock®

agent for consultations, you can find

them at www.nord-lock.com.

Pre-assembled

Nord-Lock® washers are available as pre-

assembled pairs. A standard hot melt

glue (NATIONAL 281E) is used between

the Nord-Lock® washers.

Norm C < % Si < % Mn < % P < % S < % Cr % Mo % Ni %

SS 2343 0,05 1,00 2,00 0,045 0,030 16,0 – 18,5 2,50 – 3,00 10,5 – 14,0

EN 1.4436 0,07 1,00 2,00 0,045 0,025 16,5 – 18,5 2,50 – 3,00 11,0 – 14,0

AISI 316 0,08 1,00 2,00 0,045 0,025 16,0 – 18,0 2,00 – 3,00 10,0 – 14,0

Nord-Lock® washers are made of stainless steel SS 2343.

Torque – Friction – Load

Of course a bolt will give different

tensions due to surface conditions,

though the applied torque is the same.

Reusability

Since sliding always occurs between

the Nord-Lock® washers and the head

of the bolt/nut when tightening, and

between the cam faces of the washers

when untightening, the friction will

not increase under the nut/bolt as with

other serrated fasteners.

Hardness

Stainless steel specifications of A4

15

10

5

2015105 25-10-15-20-25 -5

6

15

10

5

Torque – load diagrams

Regular nut M8 on aluminium with Nord-Lock® washers

Regular nut M8 on steel with Nord-Lock® washers

Regular nut M8 on aluminium without washer

Regular nut M8 on steel without washer

Load

[kN

]

Torque [Nm]

TighteningUntightening

Torque [Nm]

TighteningUntightening

Load

[kN

]

Above diagram shows the deviation in clamp load when not using any washer. When applying the same tightening torque you will receive different clamp load values depending on the material

you are tightening against (aluminium or steel). Because of the higher friction when tightening against aluminium the clamp load will be much lower.

When using Nord-Lock® washers sliding will always occur between the same surfaces, i.e. between the washer and

the head of the bolt, with the same surface conditions. You will receive a

clamp load with a minimum of deviation.

It has become more and more important to have good control of the torque-clamp load relationship when tightening a joint. To optimize the design of the joint and utilize as much of the capacity of each dimension as possible, you need to know the required tightening

torque to obtain the desired clamp load with a minimum of deviation. Due to the fact that the clamp load of the joint depends on the friction between the sliding surfaces, youwill receive different clamp loadsdepending on the surface conditions.

7

Nord-Lock washer material / type guide

Steel type EN 1.7182 or equivalent EN 1.4404 or equivalent EN 1.4547 or equivalent EN 2.4819 or equivalent EN 2.4667 or equivalent

Examples ofapplications

General steel applications

General stainless steel applications.Non chlorine / acidenvironments

General salt water applications, pumps, chloride applications,heat exchangers, nuclear,desalination, food processing & medicalequipment

General acidic environments, process and chemical industry, evaporators, offshore downhole tooling

Applications with high temperatures, gasturbines, turbochargers, incinerators

Available forbolt sizes

#5 to 5” (see page 8 for dimensions)

#5 to 3 1/8” (see page 10 for dimensions)

#5 to 1 1/2” (see page11 for dimensions)

#5 to 1 1/2” available upon request

#5 to 1 1/2” available upon request

Washer types Regular outer diameter(NL3–NL130)

Enlarged outer diameter(NL3.5sp–NL36sp)

Regular outer diameter(NL3ss–NL80ss)

Enlarged outer diameter(NL3.5spss–NL30spss)

Regular outer diameter(NL3ss-254–NL39ss-254)

Enlarged outer diameter(NL3.5spss-254–NL27spss-254)

Regular outer diameter (NL3ss-276–NL39ss-276)

Enlarged outer diameter (NL3.5spss-276–NL27spss-276)

Regular outer diameter(NL3ss-718–NL39ss-718)

Enlarged outer diameter(NL3.5spss-718–NL27spss-718)

Treatment

Surface coating

Through hardened

Delta Protekt® base coat(KL100) and top coat(VH302GZ)

Surface hardened Surface hardened Surface hardened Surface hardened

Washer hardness* ≥ 465 HV1 ≥ 520HV0.05 ≥ 600HV0.05 ≥ 520HV0.05 ≥ 620HV0.05

Corrosionresistance

Minimum 600 hours in salt spray test (according to IS09227)

PREN 27** PREN 45** PREN 68** PREN 29**

Bolt grades Up to ASTM A574 Up to ASTM F593 Up to ASTM F593 Up to ASTM F593 Up to ASTM F593

Temperature range***

-4F to 392F -256F to 932F -256F to 932F -256F to 932F -256F to 1292F

Application parameter

Steel washers

Stainless steel (ss) washers

254 SMO® washers

INCONEL®/HASTELLOY® C-276 washers

INCONEL® 718 washers

* In order to assure the unique mechanical locking function of the Nord-Lock washers, the hardness of the mating surfacesmust be lower than the hardness of the Nord-Lock washers (see table above).

** PREN (Pitting Resistance Equivalent Number) = %Cr + 3.3x%Mo + 16x%N. Figures in table valid for base material.

*** Temperature recommendations based on information from the raw material supplier. Locking function not affected within the specification.

Øo

Øi

T

8

NL3 – NL8Ø i ±0,1 mm

NL10 – NL42Ø i ±0,2 mm

NL45 – NL130Ø i +0,5/-0 mm

NL3 – NL24Øo ± 0,2 mm

NL27 – NL42Øo ± 0,3 mm

NL45 – NL130Øo +0/-2,0 mm

NL3 – NL24T ± 0,25 mm

NL27 – NL42T +0/-0,5 mm

NL45 – NL130T ± 0,75 mm

NORD-LOCK washer dimensions METRIC - preassembled pairs

STEEL, ZINC FLAKE COATED (DELTA PROTEKT®) - ELV & RoHS COMPLIANT

* NL45–NL130 upon inquiry

Materials and dimensions are subject to change without prior notice.

Please consult our website for current dimensions:

www.nord-lock.com

Washersize

Bolt sizeMetric UNC

øi

[mm]øo

[mm]Thickness T

[mm]Min. package

[pairs]Approx. weight

kg / 100 pairs

NL3 M3 #5 3,4 7,0 1,8 200 0,04NL3,5 M3,5 #6 3,9 7,6 1,8 200 0,03NL3,5sp M3,5 #6 3,9 9,0 1,8 200 0,06NL4 M4 #8 4,4 7,6 1,8 200 0,04NL4sp M4 #8 4,4 9,0 1,8 200 0,06NL5 M5 #10 5,4 9,0 1,8 200 0,05NL5sp M5 #10 5,4 10,8 1,8 200 0,11NL6 M6 6,5 10,8 1,8 200 0,07NL6sp M6 6,5 13,5 2,5 200 0,20NL1/4” 1/4” 7,2 11,5 1,8 200 0,08NL1/4”sp 1/4” 7,2 13,5 2,5 200 0,18NL8 M8 5/16” 8,7 13,5 2,5 200 0,15NL8sp M8 5/16” 8,7 16,6 2,5 200 0,29NL3/8” 3/8” 10,3 16,6 2,5 200 0,23NL3/8”sp 3/8” 10,3 21,0 2,5 200 0,46NL10 M10 10,7 16,6 2,5 200 0,23NL10sp M10 10,7 21,0 2,5 200 0,44NL11 M11 7/16” 11,4 18,5 2,5 200 0,29NL12 M12 13,0 19,5 2,5 200 0,29NL12sp M12 13,0 25,4 3,4 100 0,91NL1/2” 1/2” 13,5 19,5 2,5 200 0,27NL1/2”sp 1/2” 13,5 25,4 3,4 100 0,93NL14 M14 9/16” 15,2 23,0 3,4 100 0,63NL14sp M14 9/16” 15,2 30,7 3,4 100 1,46NL16 M16 5/8” 17,0 25,4 3,4 100 0,69NL16sp M16 5/8” 17,0 30,7 3,4 100 1,29NL18 M18 19,5 29,0 3,4 100 0,85NL18sp M18 19,5 34,5 3,4 100 1,58NL3/4” 3/4” 20,0 30,7 3,4 100 1,05NL3/4”sp 3/4” 20,0 39,0 3,4 100 2,20NL20 M20 21,4 30,7 3,4 100 0,95NL20sp M20 21,4 39,0 3,4 100 2,03NL22 M22 7/8” 23,4 34,5 3,4 100 1,29NL22sp M22 7/8” 23,4 42,0 4,6 50 3,31NL24 M24 25,3 39,0 3,4 100 1,68NL24sp M24 25,3 48,5 4,6 50 4,51NL1” 1” 27,9 39,0 3,4 100 1,53NL1”sp 1” 27,9 48,5 4,6 50 4,20NL27 M27 28,4 42,0 6,6 50 3,29NL27sp M27 28,4 48,5 6,6 25 5,39NL30 M30 1 1/8” 31,4 47,0 6,6 50 4,20NL30sp M30 1 1/8” 31,4 58,5 6,6 25 8,96NL33 M33 1 1/4” 34,4 48,5 6,6 25 3,97NL33sp M33 1 1/4” 34,4 58,5 6,6 25 8,31NL36 M36 1 3/8” 37,4 55,0 6,6 25 5,59NL36sp M36 1 3/8” 37,4 63,0 6,6 25 9,15NL39 M39 1 1/2” 40,4 58,5 6,6 25 6,28NL42 M42 43,2 63,0 6,6 25 7,47NL45 M45 1 3/4” 46,2 70,0 7,0 25 * 10,20NL48 M48 49,6 75,0 7,0 25 * 12,00NL52 M52 2” 53,6 80,0 7,0 25 * 13,00NL56 M56 2 1/4” 59,1 85,0 7,0 10 * 13,50NL60 M60 63,1 90,0 9,5 10 * 15,20NL64 M64 2 1/2” 67,1 95,0 9,5 10 * 16,70NL68 M68 71,1 100,0 9,5 1 * 28,19NL72 M72 75,1 105,0 9,5 1 * 30,70NL76 M76 3” 79,1 110,0 9,5 1 * 33,31NL80 M80 83,1 115,0 9,5 1 * 36,02NL85 M85 88,1 120,0 9,5 1 * 37,84NL90 M90 92,4 130,0 9,5 1 * 47,67NL95 M95 97,4 135,0 9,5 1 * 49,81NL100 M100 103,4 145,0 9,5 1 * 58,91NL105 M105 108,4 150,0 9,5 1 * 61,28NL110 M110 113,4 155,0 9,5 1 * 63,65NL115 M115 118,4 165,0 9,5 1 * 75,28NL120 M120 123,4 170,0 9,5 1 * 77,94NL125 M125 128,4 173,0 9,5 1 * 76,63NL130 M130 133,4 178,0 9,5 1 * 79,17

9

Torque guidelines

NORD-LOCK zinc flake coated (DP = Delta Protekt®) washerswith electro zinc plated bolt 8.8

Torque guidelines for other bolt

grades are available on request

through your local NORD-LOCK

representative.

GTP600 = graphite lubricant

GF = ratio of yield point

μg = thread friction

μw = washer friction

Oil, GF=0,75 GTP600, GF=0,75 Dry, GF=0,62

μg = 0,10, μw = 0,16 μg = 0,08, μw = 0,15 μg = 0,15, μw = 0,18

Washer size

Bolt size

Pitch [mm]

Torque [Nm]

Clamp load [kN]

Torque [Nm]

Clamp load [kN]

Torque [Nm]

Clamp load [kN]

NL3 M3 0,5 1,3 2,4 1,2 2,4 1,3 2,0

NL4 M4 0,7 3,1 4,2 2,8 4,2 3,1 3,5

NL5 M5 0,8 6,0 6,8 5,4 6,8 6,0 5,6

NL6 M6 1,0 10,5 9,7 9,5 9,7 10,5 8,0

NL8 M8 1,25 25 18 23 18 25 15

NL10 M10 1,5 49 28 45 28 50 23

NL12 M12 1,75 85 40 77 40 85 33

NL14 M14 2,0 135 55 122 55 136 46

NL16 M16 2,0 205 75 185 75 208 62

NL18 M18 2,5 288 92 260 92 291 76

NL20 M20 2,5 402 118 363 118 408 97

NL22 M22 2,5 548 146 494 146 557 120

NL24 M24 3,0 693 169 625 169 703 140

NL27 M27 3,0 1 010 221 910 221 1028 182

NL30 M30 3,5 1379 269 1 243 269 1 401 222

NL33 M33 3,5 1855 333 1 669 333 1 889 275

NL36 M36 4,0 2 394 392 2 156 392 2 436 324

NL39 M39 4,0 3 087 468 2 777 468 3145 387

NL42 M42 4,5 3 820 538 3 439 538 3 890 445

Oil, GF=0,71 GTP600, GF=0,75

μg = 0,13, μw = 0,12 μg = 0,08, μw = 0,11

Washer size

Bolt size

Pitch [mm]

Torque [Nm]

Clamp load [kN]

Torque [Nm]

Clamp load [kN]

NL3 M3 0,5 2,0 3,9 1,7 4,1

NL4 M4 0,7 4,6 6,7 4,0 7,1

NL5 M5 0,8 9,1 10,9 7,7 11,5

NL6 M6 1,0 15,8 15,4 13,5 16,3

NL8 M8 1,25 38 28 32 30

NL10 M10 1,5 75 44 64 47

NL12 M12 1,75 128 65 109 68

NL14 M14 2,0 204 89 174 94

NL16 M16 2,0 311 120 263 127

NL18 M18 2,5 437 148 370 156

NL20 M20 2,5 610 188 515 198

NL22 M22 2,5 831 233 699 246

NL24 M24 3,0 1 052 270 887 286

NL27 M27 3,0 1533 352 1288 372

NL30 M30 3,5 2091 430 1761 454

NL33 M33 3,5 2 815 532 2362 562

NL36 M36 4,0 3633 626 3053 662

NL39 M39 4,0 4683 748 3925 790

NL42 M42 4,5 5799 860 4866 908

NORD-LOCK zinc flake coated (DP) with non-plated bolt 12.9NORD-LOCK zinc flake coated (DP) with non-plated bolt 10.9

Oil, GF=0,71 GTP600, GF=0,75

μg = 0,13, μw = 0,14 μg = 0,08, μw = 0,13

Washer size

Bolt size

Pitch [mm]

Torque [Nm]

Clamp load [kN]

Torque [Nm]

Clamp load [kN]

NL3 M3 0,5 1,8 3,2 1,6 3,4

NL4 M4 0,7 4,1 5,6 3,6 5,9

NL5 M5 0,8 8,1 9,1 7,0 9,6

NL6 M6 1,0 14,1 12,9 12,3 13,6

NL8 M8 1,25 34 23 30 25

NL10 M10 1,5 67 37 58 39

NL12 M12 1,75 115 54 99 57

NL14 M14 2,0 183 74 158 78

NL16 M16 2,0 279 100 240 106

NL18 M18 2,5 391 123 337 130

NL20 M20 2,5 547 156 470 165

NL22 M22 2,5 745 194 639 205

NL24 M24 3,0 942 225 809 238

NL27 M27 3,0 1375 294 1176 310

NL30 M30 3,5 1875 358 1608 378

NL33 M33 3,5 2526 443 2157 468

NL36 M36 4,0 3259 522 2788 551

NL39 M39 4,0 4203 624 3 588 659

NL42 M42 4,5 5202 716 4445 757

Øo

Øi

T

NL3 ss – NL8ss Ø i ±0,1 mm

NL10 ss – NL42ss Ø i ±0,2 mm

NL45ss – NL80ss Ø i +0,5 / -0,0 mm

NL3ss – NL24ss Øo ± 0,2 mm

NL27ss – NL42ss Øo ± 0,3 mm

NL45 ss – NL80ss Øo +0,0 / -2,0 mm

NL3ss – NL24ss T ± 0,25 mm

NL27ss – NL42ss T +0,0 / -0,5 mm

NL45ss – NL80ss T ± 0,75 mm

NL3ss M3 #5 3,4 7,0 2,2 200 0,04NL3,5ss M3,5 #6 3,9 7,6 2,2 200 0,04NL3,5spss M3,5 #6 3,9 9,0 2,2 200 0,07NL4ss M4 #8 4,4 7,6 2,2 200 0,04NL4spss M4 #8 4,4 9,0 2,2 200 0,07NL5ss M5 #10 5,4 9,0 2,2 200 0,06NL5spss M5 #10 5,4 10,8 2,2 200 0,11NL6ss M6 6,5 10,8 2,2 200 0,09NL6spss M6 6,5 13,5 2,0 200 0,16NL1/4”ss 1/4” 7,2 11,5 2,2 200 0,09NL1/4”spss 1/4” 7,2 13,5 2,2 200 0,15NL8ss M8 5/16” 8,7 13,5 2,0 200 0,12NL8spss M8 5/16” 8,7 16,6 2,0 200 0,22NL3/8”ss 3/8” 10,3 16,6 2,0 200 0,19NL3/8”spss 3/8” 10,3 21,0 2,0 200 0,38NL10ss M10 10,7 16,6 2,0 200 0,18NL10spss M10 10,7 21,0 2,0 200 0,37NL11ss M11 7/16” 11,4 18,5 2,2 200 0,26NL12ss M12 13,0 19,5 2,0 200 0,23NL12spss M12 13,0 25,4 3,0 100 0,82NL1/2”ss 1/2” 13,5 19,5 2,0 200 0,24NL1/2”spss 1/2” 13,5 25,4 3,2 100 0,80NL14ss M14 9/16” 15,2 23,0 3,0 100 0,49NL14spss M14 9/16” 15,2 30,7 3,2 100 1,31NL16ss M16 5/8” 17,0 25,4 3,0 100 0,59 NL16spss M16 5/8” 17,0 30,7 3,2 100 1,13NL18ss M18 19,5 29,0 3,2 100 0,80NL18spss M18 19,5 34,5 3,2 100 1,56NL3/4”ss 3/4” 20,0 30,7 3,2 100 0,96NL3/4”spss 3/4” 20,0 39,0 3,2 100 2,10NL20ss M20 21,4 30,7 3,0 100 0,82NL20spss M20 21,4 39,0 3,2 100 2,06NL22ss M22 7/8” 23,4 34,5 3,2 100 1,23NL22spss M22 7/8” 23,4 42,0 3,2 50 2,23NL24ss M24 25,3 39,0 3,2 100 1,52NL24spss M24 25,3 48,5 3,2 50 3,50NL1”ss 1” 27,9 39,0 3,2 100 1,42NL1”spss 1” 27,9 48,5 3,2 50 3,22NL27ss M27 28,4 42,0 6,8 50 3,45NL27spss M27 28,4 48,5 6,8 25 5,85NL30ss M30 1 1/8” 31,4 47,0 6,8 50 4,43NL30spss M30 1 1/8” 31,4 58,5 6,8 25 9,53NL33ss M33 1 1/4” 34,4 48,5 6,8 25 4,25NL36ss M36 1 3/8” 37,4 55,0 6,8 25 5,96NL39ss M39 1 1/2” 40,4 58,5 6,8 25 6,74NL42ss M42 43,2 63,0 6,8 25 7,96NL45ss M45 1 3/4” 46,2 70,0 6,8 25 10,20NL48ss M48 49,6 75,0 6,8 25 12,00NL52ss M52 2” 53,6 80,0 9,0 1 20,10NL56ss M56 2 1/4” 59,1 85,0 9,0 1 21,30NL60ss M60 63,1 90,0 9,0 1 23,50NL64ss M64 2 1/2” 67,1 95,0 9,0 1 25,80NL68ss M68 71,1 100,0 9,0 1 28,20NL72ss M72 75,1 105,0 9,0 1 30,70NL76ss M76 3” 79,1 110,0 9,0 1 33,30NL80ss M80 3 1/8” 83,1 115,0 9,0 1 36,00

NL3 ss M3 0,5 1,5 1,5 1,7 2,0NL4 ss M4 0,7 3,0 2,6 3,6 3,4NL5 ss M5 0,8 5,5 4,1 6,7 5,5NL6 ss M6 1,0 8,1 5,9 11,2 7,8NL8 ss M8 1,25 18 11 21 14NL10 ss M10 1,5 26 17 34 23NL12 ss M12 1,75 41 25 62 33NL14 ss M14 2,0 68 34 101 45NL16 ss M16 2,0 108 46 157 61NL18 ss M18 2,5 157 56 224 75NL20 ss M20 2,5 223 72 318 95NL22 ss M22 2,5 310 89 438 118NL24 ss M24 3,0 397 103 558 137NL27 ss M27 3,0 589 134 823 179NL30 ss M30 3,5 815 164 1132 219NL36ss M36 4,0 1445 239 1993 319

Nord-Lock stainless steel washersEN 1.4404 (AISI 316L) or equivalent, surface hardened

Torque guidelines for other bolt grades are available through your local Nord-Lock representative.

EN 1.4404 is an austenitic chromium-nickel stainless steel containing molybdenum. This stainless steel also has extra low carbon content in order to reduce the risk of chromium-carbide precipitation. EN 1.4404 is one of the most commonly used stainless steel grades and Nord-Lock washers made of EN 1.4404 are suitable for most applications where no chlorides or acids are present.

Cu/C paste = Copper/graphite paste (Molykote® 1000)GF = ratio of yield pointμth = thread frictionμb = washer friction

1 N = 0,225 lb1 Nm = 0,738 ft-lb

Washer size Bolt size øi [mm]

øo[mm]

Thickness T[mm]

Min.package[pairs]

Approx.weight

kg / 100 pairsMetric UNC

A4-70, Cu/C paste, GF =65% μth = 0,12, μb = 0,14

A4-80, Cu/C paste, GF =65%, μth = 0,12, μb= 0,14

Washersize

Bolt size

Pitch [mm]

Torque [Nm]

Clamp load [kN]

Torque [Nm]

Clamp load [kN]

• Please consult our website for current dimensions and 2D / 3D CAD models: www.nord-lock.com/cad

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Nord-Lock washers made of stainless steel are standard stock items, yet subject to prior sale.

Torque guidelinesNord-Lock stainless steel washers with stainless steel bolt, lubricated with copper/graphite paste (Molykote® 1000).

Dimension chart

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Nord-Lock washers joint guide

Tapped holesNord-Lock washers safely lock the bolt against the underlying surface.

Stud boltsNord-Lock washers safely lock the nut on stud bolts and eliminate the need for adhesives.

Through holesAs for all locking washers, through holes require two pairs of Nord-Lock washers – one pairfor securing the bolt and a second pair for securing the nut.Turn both fasteners in order to close the cams on both washer pairs before tightening to minimize settlements. Keep the nut secured while tightening the bolt.

Counter boresThe outer diameter of regular Nord-Lock washers is designed for counter-bore holes according to DIN 974, i.e. the washers fit under the head of standard bolts.

Applications with large / slotted holes or soft underlying surfacesTo optimize the load distribution for applications with large / slotted holes or with soft underlying surface, use a flanged nut / bolt together with Nord-Lock “SP” washers with enlarged outer diameter.

Soft underlying surfacesLarge / slotted holes

If your application corresponds to one or more of the mentioned design critera, contact your Nord-Lock representative and we will help you find an alternative solution.

Designs where Nord-Lock washers are not recommended• Mating surfaces that are not locked in place (see left figure)• Mating surfaces harder than the washers• Very soft mating surface, e.g. wood, plastic• Applications with extremely large settlements• Non-preloaded joints

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Nord-Lock SP washers on painted surface.

Nord-Lock SP washers on soft metal.

Nord-Lock SP washers on fibre surface.

Nord-Lock washers with enlarged outer diameterNord-Lock washers are available with an enlarged outer diameter, referred to as SP washers. SP washers are designed for use on large / slotted holes, painted / sensitive surfaces or soft materials. Use Nord-Lock SP washers with flanged bolts or nuts for optimum load distribution.

Ø inner regular = Ø inner sp Ø outer regular < Ø outer sp

Uniform friction with Nord-Lock washers

When using Nord-Lock washers, sliding always occurs between the upper washer and the bolt head / nut. At a given torque, the preload will be the same, regardless of the contact material.

Nord-Lock provides customized torque guidelines for your application, contact your nearest representative.

Untightening

Regular nut M8on aluminium without washer

Regular nut M8 on steel without washer

Torque [Nm]

Tightening

Load

[kN

]

Regular nut M8 on aluminium with Nord-Lock washers

Regular nut M8 on steel with Nord-Lockwashers

Torque [Nm]

TighteningUntightening

By using SP washers, the load is distributed over a larger surface which can be more gentle for sensitive surfaces. Please consult Nord-Lock to find the optimal solution for your application.

A flanged nut and Nord-Lock SP washers increase the load supporting surface for applications with slotted holes.

It is important to have control over the friction conditions in order to obtain the desired preload when tightening a joint.

When no washer is used under the fastener, the friction depends on the contact surface. At a given torque, the obtained preload will vary depending on the contact material.

www.nord-lock.com

Nord-Lock® washersNord-Lock® washers can be used on standard grade as well as high grade bolts.

Advantages• Resists loosening caused by vibration and dynamic loads• Ease of assembly and disassembly• Locking function is not lost by lubrication• Positive locking at low or high preload levels• Same temperature characteristics as standard bolt/nut• Minimum surface marring or scratching• Reusable• Achieves maximum safety when locking fasteners

Nord-Lock® can be used with bolts in tapped holes.

Nord-Lock® can also be used in counter-bored holes.

Use Nord-Lock® to lock the nut, and there is no need for adhesives to lock the stud bolt. Nord-Lock® secures the joint.

Nord-Lock® secures bolts and nuts in through holes.Note: Keep the bolt secured whentightening the nut.

Assembly examples

Please note that Nord-Lock® cannot be used on washers that are not locked in place.

For larger holes or on soft materials, use a flange nut/bolt in combination with Nord-Lock® sp (washers with larger outer diameter).

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aswelleng@gmailWebsite : www.as-well-eng.com

Kasiphat +6695 554 7745