Heavy Hex Nuts

Heavy Hex Nuts

Heavy hex nuts are used when more “beef” is needed than in standard hex nuts. Often heavy hex nuts are used in high temperature and high pressure applications, particularly those involving flanged joints. Generally the width across the flats is 1/8 of an inch larger than common hex nuts. The thickness of heavy hex nuts is equal to approximately the nominal diameter, which is about 10% thicker than a regular hex nut.

Dimensions


Nominal Size	Basic Major Diameter of Thread	F			G		H			Maximum Runout of Bearing Surface to Thread Axis, FIM (Specified Proof Load)
		Width Across Flats			Width Across Corners		Thickness Heavy Hex Nuts
		Basic	Min	Max	Min	Max	Basic	Min	Max	Up to 150,000 psi	150,000 psi and Greater
1/4	0.2500	1/2	0.488	0.500	0.556	0.577	15/64	0.218	0.250	0.017	0.011
5/16	0.3125	9/16	0.546	0.562	0.622	0.650	19/64	0.280	0.314	0.020	0.012
3/8	0.3750	11/16	0.669	0.688	0.763	0.794	23/64	0.341	0.377	0.021	0.014
7/16	0.4375	3/4	0.728	0.750	0.830	0.866	27/64	0.403	0.441	0.022	0.015
1/2	0.5000	7/8	0.850	0.875	0.969	1.010	31/64	0.464	0.504	0.023	0.016
9/16	0.5625	15/16	0.909	0.938	1.037	1.083	35/64	0.526	0.568	0.024	0.017
5/8	0.6250	1-1/16	1.031	1.062	1.175	1.227	39/64	0.587	0.631	0.025	0.018
3/4	0.7500	1-1/4	1.212	1.250	1.382	1.443	47/64	0.710	0.758	0.027	0.020
7/8	0.8750	1-7/16	1.394	1.438	1.589	1.660	55/64	0.833	0.885	0.029	0.022
1	1.0000	1-5/8	1.575	1.625	1.796	1.876	63/64	0.956	1.012	0.031	0.024
1-1/8	1.1250	1-13/16	1.756	1.812	2.002	2.093	1-7/64	1.079	1.139	0.033	0.027
1-1/4	1.2500	2	1.938	2.000	2.209	2.309	1-7/32	1.187	1.251	0.035	0.030
1-3/8	1.3750	2-3/16	2.119	2.188	2.416	2.526	1-11/32	1.310	1.378	0.038	0.033
1-1/2	1.5000	2-3/8	2.300	2.375	2.622	2.742	1-15/32	1.433	1.505	0.041	0.036
1-5/8	1.6250	2-9/16	2.481	2.562	2.828	2.959	1-19/32	1.556	1.632	0.044	0.038
1-3/4	1.7500	2-3/4	2.662	2.750	3.035	3.175	1-23/32	1.679	1.759	0.048	0.041
1-7/8	1.8750	2-15/16	2.844	2.938	3.242	3.392	1-27/32	1.802	1.886	0.051	0.044
2	2.0000	3-1/8	3.025	3.125	3.449	3.608	1-31/32	1.925	2.013	0.055	0.047
2-1/4	2.2500	3-1/2	3.388	3.500	3.862	4.041	2-13/64	2.155	2.251	0.061	0.052
2-1/2	2.5000	3-7/8	3.750	3.875	4.275	4.474	2-29/64	2.401	2.505	0.068	0.058
2-3/4	2.7500	4-1/4	4.112	4.250	4.688	4.907	2-45/64	2.647	2.759	0.074	0.064
3	3.0000	4-5/8	4.475	4.625	5.102	5.340	2-61/64	2.893	3.013	0.081	0.070
3-1/4	3.2500	5	4.838	5.000	5.515	5.774	3-3/16	3.124	3.252	0.087	0.075
3-1/2	3.5000	5-3/8	5.200	5.375	5.928	6.207	3-7/16	3.370	3.506	0.094	0.081
3-3/4	3.7500	5-3/4	5.562	5.750	6.341	6.640	3-11/16	3.616	3.760	0.100	0.087
4	4.000	6-1/8	5.925	6.125	6.755	7.073	3-15/16	3.862	4.014	0.107	0.093

Finished Hex Nut Specifications

STANDARD (ASME/ANSI)
- ASME B18.2.2 – 2012
METRIC (IFI)

Industries We Serve

Nickel Systems provides high quality exotic grade materials that hold up in the toughest, most severe heat and corrosive environments. With our large inventory of specialty fasteners in stock, we are always ready to answer the call to serve the most challenging applications.

Nickel Systems can supply heavy hex nuts conforming to: ASTM A194 2H (1045 Steel, Heat-Treated), ASTM A194 Grade 6 (410 Stainless), ASTM A194 Grade 8 (304 Stainless), ASTM A194 Grade 8C (347 Stainless), ASTM A194 Grade 8M (316 Stainless), A194 Grade 8R (Nitronic® 50), A194 Grade 8S (Nitronic® 60) and A194 Grade 8T (321 Stainless).

Nickel Systems is not limited to materials covered by ASTM A194. We maintain heavy hex nut inventory in Hastelloy® C (Alloy C276), Carpenter® 20 (Alloy 20) and Duplex 2205. Metric sizes and other alloys can be provided.

Heavy Hex Nuts

Specifications & Technical Data

Dimensions

Finished Hex Nut Specifications

In-stock

Heavy Hex Nuts Available Materials

Industries We Serve

Air Pollution Control

Chemical Processing

Electronics & Semi-conductors

Power Generation

Water Systems

Pulp & Paper Mills

Oil & Gas

Pumps & Seals

Aerospace

Valves

Glass Manufacturing

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