Class III Medium Fit Tolerance Chart for Holes and Bolts

Tolerances, Engineering Design & Limits & Fits

Related Resources:

Geometric Boundaries II GD&T Reference Book

Class III Medium Fit Tolerance Chart for Holes and Bolts per ANSI 4.1

Medium running fits tolerances are intended for higher running speeds, or heavy journal pressures, or both.

Class III Medium Fit Tolerance Chart for Holes and Bolts
Basic
Diameter
Hole
Diameter
Shaft
Diameter
Clearance
Maximum
Minimum
.125 .1250
.1258
.1248
.1242
.0002
.0016
.156 .1562
.1570
.1560
.1554
.0002
.0016
.188 .1875
.1893
.1873
.1867
.0002
.0016
.213 .2188
.2196
.2186
.2180
.0002
.0016
.250 .2500
.2508
.2498
.2492
.0002
.0016
.281 .2812
.2820
.2808
.2800
.0004
.0020
.312 .3125
.3133
.3121
.3113
.0004
.0020
.344 .3438
.3446
.3434
.3425
.0004
.0020
.375 .3750
.3758
.3746
.3738
.0004
.0020
.406 .4062
.4070
.4058
.4050
.0004
.0020
.438 .4375
.4383
.4371
.4363
.0004
.0020
.469 .4688
.4796
.4684
.4675
.0004
.0020
.500 .5000
.5008
.4996
.4988
.0004
.0020
.562 .5625
.5634
.5619
.5610
.0006
.0024
.625 .6250
.6259
.6244
.6235
.0006
.0024
.688 .6875
.6884
.6869
.6860
.0006
.0024
.750 .7500
.7509
.7494
.7485
.0006
.0024
.812 .8125
.8134
.8117
.8107
.0008
.0027
.875 .8750
.8759
.8742
.8732
.0008
.0027
.938 .9375
.9384
.9367
.9357
.0008
.0027
1.000 1.0000
1.0009
.9992
.9982
.0008
.0027
1.125 1.1250
1.1260
1.1240
1.1229
.0010
.0031
1.250 1.2500
1.2510
1.2490
1.2479
.0010
.0031
1.375 1.3750
1.3760
1.3740
1.3724
.0010
.0031
1.500 1.5000
1.5010
1.4990
1.4979
.0010
.0031
1.625 1.6250
1.6260
1.6237
1.6225
.0013
.0035
1.750 1.7500
1.7510
1.7487
1.7475
.0013
.0035
1.875 1.8750
1.8760
1.8737
1.8725
.0013
.0035
2.000 2.0000
2.0010
1.9987
1.9975
.0013
.0035
2.250 2.2500
2.2511
2.2485
2.2472
.0015
.0039
2.500 2.5000
2.5011
2.4985
2.4872
.0015
.0039
2.750 2.7500
2.7511
2.7483
2.7469
.0017
.0042
3.000 3.0000
3.0011
2.9983
2.9969
.0017
.0042
3.250 3.2500
3.2512
3.2480
3.2464
.0020
.0048
3.500 3.5000
3.5012
3.4980
3.4964
.0020
.0048
3.750 3.7500
3.7512
3.7480
3.7464
.0020
.0048
4.000 4.0000
4.0012
3.9960
3.9964
.0020
.0048

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