Dimensions of Grade C Lock Nut ("Prevailing Torque" / "All Metal")

  Grade C Lock Nuts           

            Grade C Lock Nuts          

Grade C Lock Nuts (Prevailing Torque)             

Nominal Size in Inches

T                    

W B

Width Across Flats

Overall Thickness Hex Height
Nom Max Min Max Min Min
1/4 7/16 0.4385 0.428 0.226 0.212 0.145
5/16 1/2 0.5020 0.489 0.273 0.258 0.166
3/8 9/16 0.5645 0.551 0.337 0.320 0.198
7/16 11/16 0.6895 0.675 0.385 0.365 0.223
1/2 3/4 0.7520 0.736 0.448 0.427 0.262
9/16 7/8 0.8770 0.861 0.496 0.473 0.286
5/8 15/16 0.9395 0.922 0.559 0.535 0.329
3/4 1-1/8 1.1270 1.088 0.665 0.617 0.382
7/8 1-5/16 1.3145 1.2690 0.776 0.724 0.450
1" 1-1/2 1.5020 1.4500 0.887 0.831 0.513