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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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