Large Flange Nuts - Grade-F - MacLean-Fogg

Nominal Size or Basic Major Thread Diameter		F			B		H
		Width Across Flats			Flange Diameter		Nut Thickness
		Basic	Max	Min	Max	Min	Max	Min
1/4	.2500	7/16	.437	.428	.728	.700	.312	.281
5/16	.3125	1/2	.500	.489	.820	.790	.375	.343
3/8	.3750	9/16	.562	.551	.915	.885	.406	.390
7/16	.4375	11/16	.687	.675	1.131	1.100	.468	.437
1/2	.5000	3/4	.750	.736	1.205	1.171	.515	.485
Product standards require that large flange nuts 1/4 inch and larger have a raised or depressed grade marking and insignia identifying its manufacturer. The X on the image above represents one such place that the manufacturers mark may appear. MacLean-Fogg is the original writer of large flange grade-f nut specifications.

Large Flange Nut Properties

Description	A flange nut that is 6 to 25% wider than a regular flange nut.
Applications & Advantages	Spans larger holes than a standard flange nut and has a more uniform bearing-stress to clamp-force ratio.
Material	AISI 1008 - 1035 steel
Plating	See plating page for plating information.