ASME B18.2.2 Square Nuts
ASME B18.2.2 Square Nuts Dimensions (mm)
| Nominal Size (in) | Basic Major Diameter | Width Across Flats, F | Width Across Corners, G | Thickness | Runout to Thread Axis, FIM | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| Basic | Min. | Max. | Min. | Max. | Basic | Min. | Max. | |||
| 1/4 | 6.350 | 11.11 | 10.80 | 11.13 | 14.07 | 15.72 | 5.56 | 5.16 | 5.97 | 0.28 |
| 5/16 | 7.938 | 14.29 | 13.89 | 14.27 | 18.31 | 20.19 | 6.75 | 6.32 | 7.19 | 0.38 |
| 3/8 | 9.525 | 15.88 | 15.39 | 15.88 | 20.37 | 22.45 | 8.33 | 7.87 | 8.79 | 0.41 |
| 7/16 | 11.113 | 19.05 | 18.49 | 19.05 | 24.64 | 26.95 | 9.53 | 9.04 | 10.01 | 0.48 |
| 1/2 | 12.700 | 20.64 | 20.02 | 20.62 | 26.72 | 29.18 | 11.11 | 10.62 | 11.63 | 0.56 |
| 5/8 | 15.875 | 25.40 | 24.61 | 25.40 | 33.02 | 35.92 | 13.89 | 13.34 | 14.45 | 0.66 |
| 3/4 | 19.050 | 28.58 | 27.64 | 28.58 | 37.19 | 40.41 | 16.67 | 16.05 | 17.27 | 0.74 |
| 7/8 | 22.225 | 33.34 | 32.23 | 33.32 | 43.48 | 47.14 | 19.45 | 18.80 | 20.12 | 0.86 |
| 1 | 25.400 | 38.10 | 36.83 | 38.10 | 49.81 | 53.87 | 22.23 | 21.51 | 22.94 | 0.99 |
| 1 1/8 | 28.575 | 42.86 | 41.43 | 42.88 | 56.11 | 60.60 | 25.40 | 24.64 | 26.16 | 0.74 |
| 1 1/4 | 31.750 | 47.63 | 46.02 | 47.63 | 62.43 | 67.36 | 27.78 | 26.97 | 28.60 | 0.81 |
| 1 3/8 | 34.925 | 52.39 | 50.65 | 52.37 | 68.78 | 74.09 | 30.56 | 29.69 | 31.42 | 0.89 |
| 1 1/2 | 38.100 | 57.15 | 55.25 | 57.15 | 75.08 | 80.82 | 33.34 | 32.41 | 34.24 | 0.99 |
ASME B18.2.2 Square Nuts Dimensions (Inch)
| Nominal Size | Basic Major Diameter of Thread | Width Across Flats, F | Width Across Corners, G | Thickness | Bearing Surface Runout to Thread Axis, FIM | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| Basic | Min. | Max. | Min. | Max. | Basic | Min. | Max. | |||
| 1/4 | 0.2500 | 7/16 | 0.425 | 0.438 | 0.554 | 0.619 | 7/32 | 0.203 | 0.235 | 0.011 |
| 5/16 | 0.3125 | 9/16 | 0.547 | 0.562 | 0.721 | 0.795 | 17/64 | 0.249 | 0.283 | 0.015 |
| 3/8 | 0.3750 | 5/8 | 0.606 | 0.625 | 0.802 | 0.884 | 21/64 | 0.310 | 0.346 | 0.016 |
| 7/16 | 0.4375 | 3/4 | 0.728 | 0.750 | 0.970 | 1.061 | 3/8 | 0.356 | 0.394 | 0.019 |
| 1/2 | 0.5000 | 13/16 | 0.788 | 0.812 | 1.052 | 1.149 | 7/16 | 0.418 | 0.458 | 0.022 |
| 5/8 | 0.6250 | 1 | 0.969 | 1.000 | 1.300 | 1.414 | 35/64 | 0.525 | 0.569 | 0.026 |
| 3/4 | 0.7500 | 1 1/8 | 1.088 | 1.125 | 1.464 | 1.591 | 21/32 | 0.632 | 0.680 | 0.029 |
| 7/8 | 0.8750 | 1 5/16 | 1.269 | 1.312 | 1.712 | 1.856 | 49/64 | 0.740 | 0.792 | 0.034 |
| 1 | 1.0000 | 1 1/2 | 1.450 | 1.500 | 1.961 | 2.121 | 7/8 | 0.847 | 0.903 | 0.039 |
| 1 1/8 | 1.1250 | 1 11/16 | 1.631 | 1.688 | 2.209 | 2.386 | 1 | 0.970 | 1.030 | 0.029 |
| 1 1/4 | 1.2500 | 1 7/8 | 1.812 | 1.875 | 2.458 | 2.652 | 1 3/32 | 1.062 | 1.126 | 0.032 |
| 1 3/8 | 1.3750 | 2 1/16 | 1.994 | 2.062 | 2.708 | 2.917 | 1 13/64 | 1.169 | 1.237 | 0.035 |
| 1 1/2 | 1.5000 | 2 1/4 | 2.175 | 2.250 | 2.956 | 3.182 | 1 5/16 | 1.276 | 1.348 | 0.039 |