Nuts

Finished Hex Nuts

Six-sided fasteners with internal threads for secure connections.

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Standard finished hex pattern nuts in the full range of materials, from carbon steel to exotic alloys.

Dimensions

Specifications & technical data.

Finished hex nuts to ASME B18.2.2 — the standard pattern for general bolting, machined or hot-forged in every A194 grade and the stainless and nickel alloys, tapped class 2B or 3B.

Download our finished hex nut dimensioning table (PDF)

Dimension locations per ASME B18.2.2 / IFI · F = width across flats · G = width across corners · H = thickness

Finished Hex Nut Dimensions (in) — ASME B18.2.2-2010

Nominal Size (Basic Major Diameter)		F		G		H		Runout of Bearing Surface, FIM
		Width Across Flats		Width Across Corners		Thickness		By Specified Proof Load
		Min.	Max.	Min.	Max.	Min.	Max.	Up to 150,000 psi	150,000 psi & Greater
1/4"	0.250	0.428	0.438	0.488	0.505	0.212	0.226	0.015	0.010
5/16"	0.313	0.489	0.500	0.557	0.577	0.258	0.273	0.016	0.011
3/8"	0.375	0.551	0.563	0.628	0.650	0.320	0.337	0.017	0.012
7/16"	0.438	0.675	0.688	0.768	0.794	0.365	0.385	0.018	0.013
1/2"	0.500	0.736	0.750	0.840	0.866	0.427	0.448	0.019	0.014
9/16"	0.563	0.861	0.875	0.982	1.010	0.473	0.496	0.020	0.015
5/8"	0.625	0.922	0.938	1.051	1.083	0.535	0.559	0.021	0.016
3/4"	0.750	1.088	1.125	1.240	1.299	0.617	0.665	0.023	0.018
7/8"	0.875	1.269	1.312	1.447	1.516	0.724	0.776	0.025	0.020
1"	1.000	1.450	1.500	1.653	1.732	0.831	0.887	0.027	0.022
1-1/8"	1.125	1.631	1.688	1.859	1.949	0.939	0.999	0.030	0.025
1-1/4"	1.250	1.812	1.875	2.066	2.165	1.030	1.094	0.033	0.028
1-3/8"	1.375	1.994	2.062	2.273	2.382	1.138	1.206	0.036	0.031
1-1/2"	1.500	2.175	2.250	2.480	2.598	1.245	1.317	0.039	0.034
1-5/8"	1.625	2.350	2.430	2.679	2.805	1.364	1.416	0.044	0.038
1-3/4"	1.750	2.538	2.625	2.893	3.031	1.460	1.540	0.048	0.041
1-7/8"	1.875	2.722	2.813	3.103	3.247	1.567	1.651	0.051	0.044
2"	2.000	2.900	3.000	3.306	3.464	1.675	1.763	0.055	0.047
2-1/4"	2.250	3.263	3.375	3.719	3.897	1.890	1.986	0.061	0.052
2-1/2"	2.500	3.625	3.750	4.133	4.330	2.105	2.209	0.068	0.058
2-3/4"	2.750	3.988	4.125	4.546	4.763	2.319	2.431	0.074	0.064
3"	3.000	4.350	4.500	4.959	5.196	2.534	2.654	0.081	0.070
3-1/4"	3.250	4.713	4.875	5.373	5.629	2.749	2.877	0.087	0.075
3-1/2"	3.500	5.075	5.250	5.786	6.062	2.964	3.100	0.094	0.081
3-3/4"	3.750	5.438	5.625	6.199	6.495	3.178	3.322	0.100	0.087
4"	4.000	5.800	6.000	6.612	6.928	3.393	3.545	0.107	0.093

All dimensions in inches, per ASME B18.2.2-2010. FIM = maximum runout of bearing surface to thread axis, by specified proof load. Confirm requirements with our estimating team.

Manufactured to

Standards.

ASME B18.2.2Nut dimensions

ASTM A194Nut material grades

ASME B1.1Unified inch screw threads

The buyer’s guide

What are finished hex nuts?

The finished hex nut is the general-purpose pattern — chamfered faces, standard across-flats and thickness proportions, made to ASME B18.2.2. It mates with hex bolts and cap screws everywhere the heavy series is not specified.

Standard pattern — lighter than heavy hex
Machined or hot-forged in-house
Tapped class 2B or 3B
Every A194 grade plus stainless and exotics

Finished hex vs. heavy hex

Same thread, different section: the heavy hex nut runs about an eighth of an inch wider across the flats and noticeably thicker. General-purpose joints use finished; high-strength studs and pressure joints specify heavy. When in doubt, the stud grade decides — ask us.