A194 2H/2HM / A563 Heavy Hex Nuts

ASTM A325 Bolts

The ASTM A325 specification covers high strength heavy hex structural bolts from ½” diameter through 1-1/2” diameter. These bolts are intended for use in structural connections and therefore have shorter thread lengths than standard hex bolts. Refer to the Structural Bolts page of our site for thread lengths and other related dimensions.

ASTM F2329

ASTM F2329 covers the requirements for hot-dip zinc coating applied to carbon steel and alloy steel bolts, screws, washers, nuts, and special threaded fasteners applied

ASTM F1554

The ASTM F1554 specification was introduced in 1994 and covers anchor bolts designed to anchor structural supports to concrete foundations. F1554 anchor bolts

ASTM A563

The ASTM A563 specification covers the chemical and mechanical requirements for carbon and alloy steel nuts used on bolts, studs, and externally threaded fasteners.

ASTM A490

The ASTM A490 specification covers quenched and tempered, alloy steel, heavy hex structural bolts from ½” diameter through 1½” diameter with a minimum 150 ksi tensile.

ASTM A449

ASTM A449 covers headed bolts, rods, and anchor bolts in diameters ranging from 1/4"" through 3"" inclusive. It is a medium strength bolt manufactured from a medium carbon or alloy steel that develops its mechanical values through a heat treating process. It is intended for general engineering applications.

Heavy Hex Nuts

Heavy hex nuts are slightly larger and thicker than standard 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

Dimensions

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)

Products Categories

Fasteners papers