ASME B18.2.2 Square Nuts

ASME B18.2.2 Square Nuts

Dimensions of Square Nuts

Nominial Size Basic Major Diameter
of Threads
Width Across Flats, F Width Across Corners, G Thickness Bearing Surface Runout
to Thread Axis, FLM
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 0.110
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 1.944 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