Hex Coupling Nuts

Hex couplers are used to connect two pieces of threaded material. Hex and heavy hex couplers are threaded right hand. If a right hand-left hand coupler is needed, consider using a sleeve nut.

See our nut compatibility chart to determine the compatible hex coupler 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 couplers are tapped oversize to compensate for the corrosion resistant coating on the bolts.

Stock

Diameters: 1/2" - 1"
Origin: Domestic and import
Finish: Black and hot-dip galvanized
Grades: A563 (grades A and DH)

Available

Diameters: 1/2" - 6"
Origin: Domestic and import
Finish: Black and hot-dip galvanized
Grades: A563 (grades A, C, and DH), A194 grade 2H

Dimensions

Finished Hex Coupler Pattern

Nominal Size	F			C		H
	Width Across Flats			Width Across Corners		Thickness
	Basic	Max	Min	Max	Min	Basic	Max	Min
1/2	3/4	.75	.736	.866	.839	1-1/2	1.51	1.49
5/8	15/16	.938	.922	1.083	1.051	1-7/8	1.89	1.86
3/4	1-1/8	1.125	1.088	1.299	1.240	2-1/4	2.27	2.22
7/8	1-5/16	1.312	1.269	1.516	1.447	2-5/8	2.65	2.60
1	1-1/2	1.500	1.450	1.732	1.653	3	3.03	2.97
1-1/8	1-11/16	1.688	1.631	1.949	1.859	3-3/8	3.40	3.34
1-1/4	1-7/8	1.875	1.812	2.165	2.066	3-3/4	3.78	3.71
1-3/8	2-1/16	2.062	1.994	2.382	2.273	4-1/8	4.16	4.09
1-1/2	2-1/4	2.250	2.175	2.598	2.480	4-1/2	4.54	4.46

Dimensions per IFI-128 2000 and ASME B18.2.2 page D-22

Heavy Hex Coupler Pattern

Nominal Size	F			C		H
	Width Across Flats			Width Across Corners		Thickness
	Basic	Max	Min	Max	Min	Basic	Max	Min
1-5/8	2-9/16	2.562	2.481	2.959	2.828	4-7/8	4.91	4.83
1-3/4	2-3/4	2.750	2.662	3.175	3.035	5-1/4	5.29	5.21
1-7/8	2-15/16	2.938	2.844	3.392	3.242	5-5/8	5.67	5.58
2	3-1/8	3.125	3.025	3.608	3.449	6	6.04	5.95
2-1/4	3-1/2	3.500	3.388	4.041	3.862	6-3/4	6.80	6.70
2-1/2	3-7/8	3.875	3.750	4.474	4.275	7-1/2	7.55	7.44
2-3/4	4-1/4	4.250	4.112	4.907	4.688	8-1/4	8.31	8.19
3	4-5/8	4.625	4.475	5.340	5.102	9	9.06	8.94
3-1/4	5	5.000	4.838	5.774	5.515	9-3/4	9.81	9.68
3-1/2	5-3/8	5.375	5.200	6.207	5.928	10-1/2	10.57	10.43
3-3/4	5-3/4	5.750	5.562	6.640	6.341	11-1/4	11.32	11.17
4	6-1/8	6.125	5.925	7.073	6.755	12	12.08	11.92
4-1/2	6-7/8	6.875	6.650	7.939	7.581	13-1/2	-	-
5	7-5/8	7.625	7.375	8.805	8.408	15	-	-

Dimensions per ASME B18.2.2 1987 (R 1999)
Note: Dimension may vary based on available raw material