Heavy Hex Nuts

Heavy hex nuts are slightly larger and thicker than standard (finished) hex nuts. There are numerous grades and the heavy pattern is typically used for large diameter and high strength bolts. See our nut compatibility chart to determine the compatible heavy hex nut(s) for a specific grade of bolt. Since hot-dip galvanizing typically adds 2.2 to 5 mils of thickness to the threaded portion of a fastener, galvanized heavy hex nuts are tapped oversize to compensate for the corrosion resistant coating on the bolts.

STOCK

Diameters: 3/8" – 2-3/4"
Origin: Domestic and import
Finish: Black and hot-dip galvanized
Grades: A563 (grades A, C, and DH), A194 grade 2H

Nominal Size	F			C		H			Weight Per Nut
	Width Across Flats			Width Across Corners		Thickness
	Basic	Max	Min	Max	Min	Basic	Max	Min
3/8	11/16	0.688	0.669	0.794	0.763	23/64	0.377	0.341	0.03
1/2	7/8	0.875	0.850	1.010	0.969	31/64	0.504	0.464	0.07
5/8	1-1/16	1.062	1.031	1.227	1.175	39/64	0.631	0.587	0.12
3/4	1-1/4	1.250	1.212	1.443	1.382	47/64	0.758	0.710	0.20
7/8	1-7/16	1.438	1.394	1.660	1.589	55/64	0.885	0.833	0.30
1	1-5/8	1.625	1.575	1.876	1.796	63/64	1.012	0.956	0.43
1-1/8	1-13/16	1.812	1.756	2.093	2.002	1-7/64	1.139	1.079	0.59
1-1/4	2	2.000	1.938	2.309	2.209	1-7/32	1.251	1.187	0.79
1-3/8	2-3/16	2.188	2.119	2.526	2.416	1-11/32	1.378	1.310	1.02
1-1/2	2-3/8	2.375	2.300	2.742	2.622	1-15/32	1.505	1.433	1.31
1-5/8	2-9/16	2.562	2.481	2.959	2.828	1-19/32	1.632	1.556	1.62
1-3/4	2-3/4	2.750	2.662	3.175	3.035	1-23/32	1.759	1.679	2.04
1-7/8	2-15/16	2.938	2.844	3.392	3.242	1-27/32	1.886	1.802	2.41
2	3-1/8	3.125	3.025	3.608	3.449	1-31/32	2.013	1.925	2.99
2-1/4	3-1/2	3.500	3.388	4.041	3.862	2-13/64	2.251	2.155	4.19
2-1/2	3-7/8	3.875	3.750	4.474	4.275	2-29/64	2.505	2.401	5.64
2-3/4	4-1/4	4.250	4.112	4.907	4.688	2-45/64	2.759	2.647	7.38
3	4-5/8	4.625	4.475	5.340	5.102	2-61/64	3.013	2.893	9.50
3-1/4	5	5.000	4.838	5.774	5.515	3-3/16	3.252	3.124	11.94
3-1/2	5-3/8	5.375	5.200	6.207	5.928	3-7/16	3.506	3.370	15.26
3-3/4	5-3/4	5.750	5.562	6.640	6.341	3-11/16	3.760	3.616	18.12
4	6-1/8	6.125	5.925	7.073	6.755	3-15/16	4.014	3.862	21.80

Dimensions per ASME B18.2.2 1987 (1999)