ASME B18.2.2 Heavy Hex Flat Jam Nuts
ASME B18.2.2 Heavy Hex Flat Jam Nuts Dimensions (mm)
| Nominal Size | Basic Major Diameter of Thread | Width Across Flats, F | Width Across Corners, G | Thickness, H1 | Bearing Surface Runout to Thread Axis, FIM | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| Basic | Min. | Max. | Min. | Max. | Basic | Min. | Max. | |||
| 1 1/8 | 28.575 | 46.038 | 44.602 | 46.025 | 50.851 | 53.162 | 15.875 | 14.707 | 16.637 | 0.813 |
| 1 1/4 | 31.750 | 50.800 | 49.225 | 50.800 | 56.109 | 58.649 | 19.050 | 17.450 | 19.863 | 0.864 |
| 1 3/8 | 34.925 | 55.563 | 53.823 | 55.575 | 61.366 | 64.160 | 20.638 | 18.974 | 21.488 | 0.965 |
| 1 1/2 | 38.100 | 60.325 | 58.420 | 60.325 | 66.599 | 69.647 | 22.225 | 20.523 | 23.139 | 1.041 |
| 1 3/4 | 44.450 | 69.850 | 67.615 | 69.850 | 77.089 | 80.645 | 25.400 | 23.597 | 26.416 | 1.219 |
| 2 | 50.800 | 79.375 | 76.835 | 79.375 | 87.605 | 91.643 | 28.575 | 26.670 | 29.693 | 1.372 |
| 2 1/4 | 57.150 | 88.900 | 86.055 | 88.900 | 98.095 | 102.641 | 31.750 | 29.337 | 32.969 | 1.549 |
| 2 1/2 | 63.500 | 98.425 | 95.250 | 98.425 | 108.585 | 113.640 | 38.100 | 35.585 | 39.421 | 1.702 |
| 2 3/4 | 69.850 | 107.950 | 104.445 | 107.950 | 119.075 | 124.638 | 41.275 | 38.659 | 42.697 | 1.880 |
| 3 | 76.200 | 117.475 | 113.665 | 117.475 | 129.591 | 135.636 | 44.450 | 41.732 | 45.974 | 2.032 |
| 3 1/4 | 82.550 | 127.000 | 122.885 | 127.000 | 140.081 | 146.660 | 47.625 | 44.399 | 49.251 | 2.210 |
| 3 1/2 | 88.900 | 136.525 | 132.080 | 136.525 | 150.571 | 157.658 | 50.800 | 47.498 | 52.527 | 2.362 |
| 3 3/4 | 95.250 | 146.050 | 141.275 | 146.050 | 161.061 | 168.656 | 53.975 | 50.546 | 55.804 | 2.540 |
| 4 | 101.600 | 155.575 | 150.495 | 155.575 | 171.577 | 179.654 | 57.150 | 53.645 | 59.080 | 26.924 |
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ASME B18.2.2 Heavy Hex Flat Jam Nuts Dimensions (Inch)
| Nominal Size | Basic Major Diameter of Thread | Width Across Flats, F | Width Across Corners, G | Thickness, H1 | Bearing Surface Runout to Thread Axis, FIM | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| Basic | Min. | Max. | Min. | Max. | Basic | Min. | Max. | |||
| 1 1/8 | 1.1250 | 1 13/16 | 1.756 | 1.812 | 2.002 | 2.093 | 5/8 | 0.579 | 0.655 | 0.032 |
| 1 1/4 | 1.2500 | 2 | 1.938 | 2.000 | 2.209 | 2.309 | 3/4 | 0.687 | 0.782 | 0.034 |
| 1 3/8 | 1.3750 | 2 3/16 | 2.119 | 2.188 | 2.416 | 2.526 | 13/16 | 0.747 | 0.846 | 0.038 |
| 1 1/2 | 1.5000 | 2 3/8 | 2.300 | 2.375 | 2.622 | 2.742 | 7/8 | 0.808 | 0.911 | 0.041 |
| 1 3/4 | 1.7500 | 2 3/4 | 2.662 | 2.750 | 3.035 | 3.175 | 1 | 0.929 | 1.040 | 0.048 |
| 2 | 2.0000 | 3 1/8 | 3.025 | 3.125 | 3.449 | 3.608 | 1 1/8 | 1.050 | 1.169 | 0.054 |
| 2 1/4 | 2.2500 | 3 1/2 | 3.388 | 3.500 | 3.862 | 4.041 | 1 1/4 | 1.155 | 1.298 | 0.061 |
| 2 1/2 | 2.5000 | 3 7/8 | 3.750 | 3.875 | 4.275 | 4.474 | 1 1/2 | 1.401 | 1.552 | 0.067 |
| 2 3/4 | 2.7500 | 4 1/4 | 4.112 | 4.250 | 4.688 | 4.907 | 1 5/8 | 1.522 | 1.681 | 0.074 |
| 3 | 3.0000 | 4 5/8 | 4.475 | 4.625 | 5.102 | 5.340 | 1 3/4 | 1.643 | 1.810 | 0.080 |
| 3 1/4 | 3.2500 | 5 | 4.838 | 5.000 | 5.515 | 5.774 | 1 7/8 | 1.748 | 1.939 | 0.087 |
| 3 1/2 | 3.5000 | 5 3/8 | 5.200 | 5.375 | 5.928 | 6.207 | 2 | 1.870 | 2.068 | 0.093 |
| 3 3/4 | 3.7500 | 5 3/4 | 5.562 | 5.750 | 6.341 | 6.640 | 2 1/8 | 1.990 | 2.197 | 0.100 |
| 4 | 4.0000 | 6 1/8 | 5.925 | 6.125 | 6.755 | 7.073 | 2 1/4 | 2.112 | 2.326 | 1.06 |
- All dimensions are in inches.
- Bold type indicates nuts unified dimensionally with British and Canadian Standards.
- Threads are Unified Coarse-thread series (UNC), Class 2B.