Hex Flat Nuts and Hex Flat Jam Nuts
ASME B18.2.2 Dimensions of Hex Flat Nuts and Hex Flat Jam Nuts
All dimensions are in mm unless mentioned otherwise
| Nominal Size inch | Basic Major Diameter of Thread | Widtf Across Flats, F | Width Across Corners, G | Thickness Hex Flat Nuts, H | Thickness Hex Flat Jam Nuts, H1 | Bearing Surface Runout to Thread Axis, FIM |
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| Basic inch | Min. | Max | Min. | Max | Basic inch | Min. | Max | Basic inch | Min. | Max | |||
| 1 1/8 | 1.1250 | 1 11/16 | 1.631 | 1.688 | 1.859 | 1.949 | 1 | 0.970 | 1.030 | 5/8 | 0.595 | 0.655 | 0.029 |
| 1 1/4 | 1.2500 | 1 7/8 | 1.812 | 1.875 | 2.066 | 2.165 | 1 3/32 | 1.062 | 1.126 | 3/4 | 0.718 | 0.782 | 0.032 |
| 1 3/8 | 1.3750 | 2 1/16 | 1.994 | 2.062 | 2.273 | 2.382 | 1 13/64 | 1.169 | 1.237 | 4/5 | 0.778 | 0.846 | 0.035 |
| 1 1/2 | 1.5000 | 2 1/4 | 2.175 | 2.250 | 2.480 | 2.598 | 1 5/16 | 1.276 | 1.348 | 7/8 | 0.839 | 0.911 | 0.039 |