shaft & housing fits - nachi america
TRANSCRIPT
Phone: (800) 829-5787 • [email protected] • www.nachiamerica.com/Bearings
APPLICATION QUESTIONS2-D DRAWINGS/3-D MODELSFAILURE ANALYSIS
Shaft & Housing FitsRed = Interference
Green = Transition Blue = Clearance
Standard Electric Motor Fit (k5)
BORE TOLERANCE
O.D. TOLERANCE
HOUSING
SHAFT
f6 g6 g5 h8 h6 h5 j5 js5 j6 js6 k5 k6 m5m6 n5 n6p6
p7 r6r7
F7 G7 G6 H10 H9 H8 H7 H6 J7 JS7 J6 JS6 K6 K7 M6 M7 N6 N7 P6 P7
Standard Electric Motor Fit (H7)
Tolerance Range
Housing Bore Tolerance Range
Irregularities
LoudMetallic
Sound
LoudRegular
Sound
IrregularSound
Possible Causes Corrective ActionAbnormal load
Incorrect mounting
Insufficient or incorrect lubricant
Improper clearance
Skidding of balls
Contact of rotating parts
Flaws, corrosion or scratches on the raceways
Brinelling
Flaking in the raceways
Excessive clearance
Intrusion of foreign particles
Flaws or flaking on the ball surfaces
Excessive amount of lubricant
Insufficient or incorrect lubricant
Abnormal load
Incorrect mounting
Creep of fitted surfaces, excessive seal friction
Brinelling
Flaking
Incorrect mounting
Intrusion of foreign particles
Too much lubrication
Penetration by foreign particles or other contaminants
Operating Irregularities
.3940
.4728
.5909
.6696
.7878
.9847
1.1815
BEARING SIZE.3937
.4725
.5906
.6693
.7875
.9843
1.1812
SHAFT DIAMETER(ROTATING)
1.1819
1.2608
1.3789
1.5758
1.8514
1.1811
1.2598
1.3780
1.5748
1.8504
6200
6201
6202
6203
6204
6205
6206
6207
6208
6209
6210
6211
Max. (In) Min. (In)
HOUSING BORE(STATIONARY)
Max. (In) Min. (In)
6212
6213
6214
6215
6216
6217
6218
6219
6220
6200 SERIES STANDARD ELECTRIC MOTOR FITSShaft k5, Housing H7
1.3785
1.5753
1.7722
1.9690
2.1659
1.3780
1.5749
1.7717
1.9686
2.1654
2.3628
2.5596
2.7565
2.9533
3.1502
3.3472
3.5440
2.3623
2.5591
2.7560
2.9528
3.1497
3.3466
3.5434
3.7409
3.9377
3.7403
3.9371
2.0484 2.0472
2.4421 2.4409
2.8358 2.8346
3.1508 3.1496
3.3478 3.3465
3.5447 3.5433
3.9384 3.9370
4.3321
4.7258
4.9228
5.1197
5.5134
5.9071
4.3307
4.7244
4.9213
5.1181
5.5118
5.9055
6.3008 6.2992
6.6945
7.0882
6.6929
7.0866
.3940
.4728
.5909
.6696
.7878
.9847
1.1815
BEARING SIZE.3937
.4725
.5906
.6693
.7875
.9843
1.1812
SHAFT DIAMETER(ROTATING)
1.3789
1.4577
1.6545
1.8514
2.0484
1.3780
1.4567
1.6535
1.8504
2.0472
6300
6301
6302
6303
6304
6305
6306
6307
6308
6309
6310
6311
Max. (In) Min. (In)
HOUSING BORE(STATIONARY)
Max. (In) Min. (In)
6312
6313
6314
6315
6316
6317
6318
6319
6320
6300 SERIES STANDARD ELECTRIC MOTOR FITSShaft k5, Housing H7
1.3785
1.5753
1.7722
1.9690
2.1659
1.3780
1.5749
1.7718
1.9686
2.1654
2.3628
2.5596
2.7565
2.9533
3.1502
3.3472
3.5440
2.3623
2.5591
2.7560
2.9528
3.1497
3.3466
3.5434
3.7409
3.9377
3.7403
3.9371
2.4421 2.4409
2.8358 2.8346
3.1508 3.1496
3.5447 3.5433
3.9384 3.9370
4.3321 4.3307
4.7258 4.7244
5.1197
5.5134
5.9071
6.3008
6.6945
7.0882
5.1181
5.5118
5.9055
6.2992
6.6929
7.0866
7.4821 7.4803
7.8758
8.4664
7.8740
8.4646
NOISE
AbnormalTemperature
Rise
Vibration
Leakage or Discoloration
of Lubricant
Correction of fit, internal clearance, preload, position of housing shoulder
Correction of alignment of shaft and housing, accuracy of mounting method
Replenish lubricant or select correct lubricant
Replacement by low-noise bearings, reduction of bearing’s internal clearance
Adjustment of preload, reduction of bearing’s internal clearance or adoption of softer grease
Correction of labyrinth seal
Replacement of bearing, cleaning, improvement of seals, and usage of clean lubricant
Replacement of bearing and careful handling thereafter
Replacement of bearing
Correction of fit, clearance and/or preload
Replacement of bearing, cleaning, improvement of seals, or relubrication using clean lubricant
Replacement of bearing
Reduce amount of lubricant, select stiffer grease
Replenish lubricant or select correct lubricant
Correction of fit, internal clearance, preload, position of housing shoulder
Correction of alignment of shaft and housing, accuracy of mounting, or mounting method
Correct the seals, replacement of bearing, correction of fit or mounting
Replacement of bearing and careful handling thereafter
Replacement of bearing
Correction of squareness between shaft and housing shoulder or side of spacer
Replacement of bearing, cleaning, correction of seals
Reduce amount of lubricant, select stiffer grease
Replace bearing or lubricant, clean housing and adjacent parts
LIFE CALCULATIONSBEARING SELECTION
FIT RECOMMENDATIONSBEARING ENGINEERING