Dimensions of Grade GT Flange Lock Nuts
GT Flange Style Lock Nuts                  GT Flange Style Lock Nuts
Grade GT Flange Style Lock Nuts
Nominal 
Size
F B H A K
Width Across Flats Flange Diameter Overall Thickness Hex Height Flange Thickness
Nom Max Min Max Max Min Min Min
3/8 9/16 0.5645 0.551 0.810 0.425 0.404 0.200 0.060
1/2 3/4 0.7520 0.736 1.070 0.555 0.528 0.260 0.080
5/8 15/16 0.9395 0.922 1.330 0.690 0.646 0.320 0.100
3/4 1-1/8 1.1270 1.088 1.585 0.825 0.742 0.380 0.110