Stover®-Equivalent Nuts
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Grade B Lock: An all-metal, one-piece hex nut, thicker than a Grade-C across the flats, which derives its prevailing torque characteristics from controlled distortion of the top threads from their normal helical form to a more elliptical shape.
Grade C Lock: Similar to Grade B lock nut but smaller than a Grade-B across the flats for tighter spaces. Frequently used in machinery, plus the automotive and related metalworking industries.
Grade G Flange Style: Similar to a Grade-C lock nut but with a flange on the bottom side of the nut for a greater bearing surface. Grade-G has a lower, more uniform bearing stress to clamp force ratio. This style reduces inventory (by eliminating a washer) and in-place cost. It is designed to be used specifically, but not exclusively, with grade-8 frame bolts.
Grade C Lock: Similar to Grade B lock nut but smaller than a Grade-B across the flats for tighter spaces. Frequently used in machinery, plus the automotive and related metalworking industries.
Grade G Flange Style: Similar to a Grade-C lock nut but with a flange on the bottom side of the nut for a greater bearing surface. Grade-G has a lower, more uniform bearing stress to clamp force ratio. This style reduces inventory (by eliminating a washer) and in-place cost. It is designed to be used specifically, but not exclusively, with grade-8 frame bolts.