Grade C Automation Style and Hex Collar Lock Nuts

RB & W Corp

Nominal Size in Inches	T			W		B
	Width Across Flats			Overall Thickness		Hex Height
	Nom	Max	Min	Max	Max	Min
1/4	7/16	.4385	.428	.226	.212	.145
5/16	1/2	.5020	.489	.273	.258	.166
3/8	9/16	.5645	.551	.337	.320	.198
7/16	11/16	.6895	.675	.385	.365	.223
1/2	3/4	.7520	.736	.448	.427	.262
9/16	7/8	.8770	.861	.496	.473	.286
5/8	15/16	.9395	.922	.559	.535	.329
3/4	1-1/8	1.1270	1.088	.665	.617	.382
7/8	1-5/16	1.3145	1.269	.776	.724	.450
1	1-1/2	1.5020	1.450	.887	.831	.513
Product standards require all grade-marked nuts 1/4 inch and larger to have a raised or depresses insignia identifying its manufacturer. The X on the image above represents one such location.

Nominal Size in Inches	T		W		H
	Width Across Flats		Overall Thickness		Hex Height
	Max	Min	Max	Min	Max	Min
1-1/8	1.688	1.631	.999	.939	.657	.636
1-1/4	1.875	1.812	1.094	1.030	.719	.698
1-3/8	2.062	1.994	1.206	1.138	.793	.771
1-1/2	2.250	2.175	1.317	1.245	.865	.843
1-3/4	2.625	2.538	1.540	1.460	1.012	.989
2	3.000	2.900	1.763	1.675	1.158	1.134

Description	An all metal, one-piece hex lock nut which gets its prevailing torque characteristics from controlled distortion of its top threads from their normal helical form to a more elliptical shape.
Applications & Advantages	Reusable and can withstand temperatures of up to 450°F. Can also withstand severe vibration and shock loads. Frequently used in farm machinery, automotive and related industries.
Material	C1022 - 1045 steel
Heat Treatment	Heated to the austenitizing temperature of the material and quenched in the proper medium to obtain a predominately martensitic microstructure, and tempered to the specified hardness.
Hardness	1/4 thru 5/8 inch: Rockwell C24 - C32 3/4 thru 1 inch: Rockwell C26 - C34 1/4 thru 5/8 inch: Rockwell C26 - C36
Proof Load	150,000 psi
Plating	See plating page for plating information of steel nuts.