Dimensions of Flanged Hex Nuts - Serrated
Flange Lock Nuts                Serrated Flange Lock Nuts
Serrated Flange Lock Nuts
Nominal 
Size or Basic Major Diameter of Thread
F G B H K J
Width Across Flats Width Across Corners Flange Diameter Nut Thickness Wrench
Height
Flange Thickness
Max Min Max Min Max Min Max Min Min Max
6 0.1380 0.312 0.302 0.361 0.342 0.422 0.406 0.171 0.156 0.10 0.02
8 0.1640 0.344 0.334 0.397 0.381 0.469 0.452 0.203 0.187 0.13 0.02
10 0.1900 0.375 0.365 0.433 0.416 0.500 0.480 0.219 0.203 0.13 0.03
1/4 0.2500 0.438 0.428 0.505 0.488 0.594 0.574 0.236 0.222 0.14 0.04
5/16 0.3125 0.500 0.489 0.577 0.557 0.680 0.660 0.283 0.268 0.17 0.04
3/8 0.3750 0.562 0.551 0.650 0.628 0.750 0.728 0.347 0.330 0.23 0.04
7/16 0.4375 0.688 0.675 0.794 0.768 0.937 0.910 0.395 0.375 0.26 0.04
1/2 0.5000 0.750 0.736 0.866 0.840 1.031 1.000 0.458 0.437 0.31 0.05
5/8 0.6250 0.938 0.922 1.083 1.051 1.281 1.248 0.569 0.545 0.40 0.05
3/4 0.7500 1.125 1.088 1.299 1.240 1.500 1.460 0.675 0.627 0.46 0.06