ASME B18.2.2 Heavy Square Nuts
ASME B18.2.2 Heavy Square Nuts Dimensions (mm)
| Nominal Size | Basic Major Diameter of Thread | Width Across Flats, F | Width Across Corners, G | Thickness, H | Bearing Surface Runout to Thread Axis, FIM | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| Basic | Min. | Max. | Min. | Max. | Basic | Min. | Max. | |||
| 1/4 | 6.350 | 12.700 | 12.395 | 12.700 | 16.256 | 17.958 | 6.350 | 5.537 | 6.756 | 0.660 |
| 5/16 | 7.938 | 14.288 | 13.868 | 14.275 | 18.288 | 20.193 | 7.938 | 7.112 | 8.382 | 0.762 |
| 3/8 | 9.525 | 17.463 | 16.993 | 17.475 | 22.581 | 24.714 | 9.525 | 8.661 | 9.982 | 0.914 |
| 7/16 | 11.113 | 19.050 | 18.491 | 19.050 | 24.638 | 26.924 | 11.113 | 10.236 | 11.582 | 0.991 |
| 1/2 | 12.700 | 22.225 | 21.590 | 22.225 | 28.880 | 31.420 | 12.700 | 11.786 | 13.208 | 1.168 |
| 5/8 | 15.875 | 26.988 | 26.187 | 26.975 | 35.204 | 38.176 | 15.875 | 14.910 | 16.434 | 1.422 |
| 3/4 | 19.050 | 31.750 | 30.785 | 31.750 | 41.529 | 44.907 | 19.050 | 18.034 | 19.660 | 1.651 |
| 7/8 | 22.225 | 36.513 | 35.408 | 36.525 | 47.854 | 51.638 | 22.225 | 21.158 | 22.885 | 1.905 |
| 1 | 25.400 | 41.275 | 40.005 | 41.275 | 54.153 | 58.369 | 25.400 | 24.282 | 26.111 | 2.083 |
| 1 1/8 | 28.575 | 46.038 | 44.602 | 46.025 | 60.477 | 65.100 | 28.575 | 27.407 | 29.337 | 1.600 |
| 1 1/4 | 31.750 | 50.800 | 49.225 | 50.800 | 66.827 | 71.831 | 31.750 | 30.150 | 32.563 | 1.778 |
| 1 3/8 | 34.925 | 55.563 | 53.823 | 55.575 | 73.127 | 78.588 | 34.925 | 33.274 | 35.789 | 1.930 |
| 1 1/2 | 38.100 | 60.325 | 58.420 | 60.325 | 79.451 | 85.319 | 38.100 | 36.398 | 39.014 | 2.083 |
ASME B18.2.2 Heavy Square Nuts Dimensions (Inch)
| Nominal Size | Basic Major Diameter of Thread | Width Across Flats, F | Width Across Corners, G | Thickness, H | Bearing Surface Runout to Thread Axis, FIM | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| Basic | Min. | Max. | Min. | Max. | Basic | Min. | Max. | |||
| 1/4 | 0.2500 | 1/2 | 0.488 | 0.500 | 0.640 | 0.707 | 1/4 | 0.218 | 0.266 | 0.026 |
| 5/16 | 0.3125 | 9/16 | 0.546 | 0.562 | 0.720 | 0.795 | 5/16 | 0.280 | 0.330 | 0.030 |
| 3/8 | 0.3750 | 11/16 | 0.669 | 0.688 | 0.889 | 0.973 | 3/8 | 0.341 | 0.393 | 0.036 |
| 7/16 | 0.4375 | 3/4 | 0.728 | 0.750 | 0.970 | 1.060 | 7/16 | 0.403 | 0.456 | 0.039 |
| 1/2 | 0.5000 | 7/8 | 0.850 | 0.875 | 1.137 | 1.237 | 1/2 | 0.464 | 0.520 | 0.046 |
| 5/8 | 0.6250 | 1 1/16 | 1.031 | 1.062 | 1.386 | 1.503 | 5/8 | 0.587 | 0.647 | 0.056 |
| 3/4 | 0.7500 | 1 1/4 | 1.212 | 1.250 | 1.635 | 1.768 | 3/4 | 0.710 | 0.774 | 0.065 |
| 7/8 | 0.8750 | 1 7/16 | 1.394 | 1.438 | 1.884 | 2.033 | 7/8 | 0.833 | 0.901 | 0.075 |
| 1 | 1.0000 | 1 5/8 | 1.575 | 1.625 | 2.132 | 2.298 | 1 | 0.956 | 1.028 | 0.082 |
| 1 1/8 | 1.1250 | 1 13/16 | 1.756 | 1.812 | 2.381 | 2.563 | 1 1/8 | 1.079 | 1.155 | 0.063 |
| 1 1/4 | 1.2500 | 2 | 1.938 | 2.000 | 2.631 | 2.828 | 1 1/4 | 1.187 | 1.282 | 0.070 |
| 1 3/8 | 1.3750 | 2 3/16 | 2.119 | 2.188 | 2.879 | 3.094 | 1 3/8 | 1.310 | 1.409 | 0.076 |
| 1 1/2 | 1.5000 | 2 3/8 | 2.300 | 2.375 | 3.128 | 3.359 | 1 1/2 | 1.433 | 1.536 | 0.082 |