ASME B18.2.2 Hex Jam Nuts

ASME B18.2.2 Hex Nuts and Hex Jam Nuts

Dimensions of Hex Jam Nuts

Nominial Size Basic Major Diameter of Thread Width Across Flats, F Width Across Corners, G Thickness Hex Jam Nuts, H1
Min. Max. Min. Max. Min. Max.
1/4 0.25 0.428 0.438 0.488 0.505 0.150 0.163
5/16 0.3125 0.489 0.500 0.557 0.577 0.180 0.195
3/8 0.375 0.551 0.563 0.628 0.650 0.210 0.227
7/16 0.4375 0.675 0.688 0.768 0.794 0.240 0.260
1/2 0.50 0.736 0.750 0.840 0.866 0.302 0.323
9/16 0.5625 0.861 0.875 0.982 1.010 0.301 0.324
5/8 0.625 0.922 0.938 1.051 1.083 0.363 0.387
3/4 0.75 1.088 1.125 1.240 1.299 0.398 0.446
7/8 0.875 1.269 1.312 1.447 1.516 0.458 0.510
1 1.00 1.450 1.500 1.653 1.732 0.519 0.575
1 1/8 1.125 0.631 1.688 1.859 1.949 0.579 0.639
1 1/4 1.25 1.812 1.875 2.066 2.165 0.687 0.751
1 3/8 1.375 2.994 2.062 2.273 2.382 0.747 0.815
1 1/2 1.50 2.175 2.250 2.480 2.598 0.808 0.880
1 5/8 1.625 2.350 2.430 2.679 2.805 0.868 0.944
1 3/4 1.75 2.538 2.625 2.893 3.031 0.929 1.009
1 7/8 1.875 2.722 2.813 3.103 3.247 0.989 1.009
2 2.00 2.900 3.000 3.306 3.464 1.105 1.138
2 1/4 2.25 3.263 3.375 3.719 3.897 1.155 1.267
2 1/2 2.50 3.625 3.750 4.133 4.330 1.401 1.427
2 3/4 2.75 3.988 4.125 2.622 2.742 0.808 0.880
3 3.00 4.350 4.500 4.959 5.196 1.643 1.685
3 1/4 3.25 4.713 4.875 5.373 5.629 1.748 1.814
3 1/2 3.50 5.075 5.250 5.786 6.062 1.870 1.943
3 3/4 3.75 5.438 5.625 6.199 6.495 1.990 2.072
4 4.50 5.800 6.000 6.612 6.928 2.112 2.201