ASME B18.2.2 dimensions — Hex nuts and hex jam nuts, inch series (Table 1.1.1-5 profile)

2022 edition, current · 28 sizes, 1/4-20 UNC – 1-1/2-12 UNF see the cross-reference →

We supply to ASME B18.2.2. Name it on your order.

ASME B18.2.2 dimensions

Thread size	dBasic Major Diameter (in)	TPIThreads Per Inch	Thread Series	Thread Class	sWidth Across Flats (max) (in)	sWidth Across Flats (min) (in)	eWidth Across Corners (min) (in)	eWidth Across Corners (max) (in)	mNut Height (in)	mNut Height (min) (in)	mNut Height (max) (in)	H₁Jam Nut Thickness (min) (in)	H₁Jam Nut Thickness (max) (in)
1/4-20 UNC	0.25	20	UNC	2B	0.438	0.428	0.488	0.505	0.226	0.212	0.226	0.15	0.163
1/4-28 UNF	0.25	28	UNF	2B	0.438	0.428	0.488	0.505	0.226	0.212	0.226	0.15	0.163
5/16-18 UNC	0.3125	18	UNC	2B	0.5	0.489	0.557	0.577	0.273	0.258	0.273	0.18	0.195
5/16-24 UNF	0.3125	24	UNF	2B	0.5	0.489	0.557	0.577	0.273	0.258	0.273	0.18	0.195
3/8-16 UNC	0.375	16	UNC	2B	0.563	0.551	0.628	0.65	0.337	0.32	0.337	0.21	0.227
3/8-24 UNF	0.375	24	UNF	2B	0.563	0.551	0.628	0.65	0.337	0.32	0.337	0.21	0.227
7/16-14 UNC	0.4375	14	UNC	2B	0.688	0.675	0.768	0.794	0.385	0.365	0.385	0.24	0.26
7/16-20 UNF	0.4375	20	UNF	2B	0.688	0.675	0.768	0.794	0.385	0.365	0.385	0.24	0.26
1/2-13 UNC	0.5	13	UNC	2B	0.75	0.736	0.84	0.866	0.448	0.427	0.448	0.302	0.323
1/2-20 UNF	0.5	20	UNF	2B	0.75	0.736	0.84	0.866	0.448	0.427	0.448	0.302	0.323
9/16-12 UNC	0.5625	12	UNC	2B	0.875	0.861	0.982	1.01	0.496	0.473	0.496	0.301	0.324
9/16-18 UNF	0.5625	18	UNF	2B	0.875	0.861	0.982	1.01	0.496	0.473	0.496	0.301	0.324
5/8-11 UNC	0.625	11	UNC	2B	0.938	0.922	1.051	1.083	0.559	0.535	0.559	0.363	0.387
5/8-18 UNF	0.625	18	UNF	2B	0.938	0.922	1.051	1.083	0.559	0.535	0.559	0.363	0.387
3/4-10 UNC	0.75	10	UNC	2B	1.125	1.088	1.24	1.299	0.665	0.617	0.665	0.398	0.446
3/4-16 UNF	0.75	16	UNF	2B	1.125	1.088	1.24	1.299	0.665	0.617	0.665	0.398	0.446
7/8-9 UNC	0.875	9	UNC	2B	1.312	1.269	1.447	1.516	0.776	0.724	0.776	0.458	0.51
7/8-14 UNF	0.875	14	UNF	2B	1.312	1.269	1.447	1.516	0.776	0.724	0.776	0.458	0.51
1-8 UNC	1	8	UNC	2B	1.5	1.45	1.653	1.732	0.887	0.831	0.887	0.519	0.575
1-12 UNF	1	12	UNF	2B	1.5	1.45	1.653	1.732	0.887	0.831	0.887	0.519	0.575
1-1/8-7 UNC	1.125	7	UNC	2B	1.688	1.631	1.859	1.949	0.999	0.939	0.999	0.579	0.639
1-1/8-12 UNF	1.125	12	UNF	2B	1.688	1.631	1.859	1.949	0.999	0.939	0.999	0.579	0.639
1-1/4-7 UNC	1.25	7	UNC	2B	1.875	1.812	2.066	2.165	1.094	1.03	1.094	0.687	0.751
1-1/4-12 UNF	1.25	12	UNF	2B	1.875	1.812	2.066	2.165	1.094	1.03	1.094	0.687	0.751
1-3/8-6 UNC	1.375	6	UNC	2B	2.062	1.994	2.273	2.382	1.206	1.138	1.206	0.747	0.815
1-3/8-12 UNF	1.375	12	UNF	2B	2.062	1.994	2.273	2.382	1.206	1.138	1.206	0.747	0.815
1-1/2-6 UNC	1.5	6	UNC	2B	2.25	2.175	2.48	2.598	1.317	1.245	1.317	0.808	0.88
1-1/2-12 UNF	1.5	12	UNF	2B	2.25	2.175	2.48	2.598	1.317	1.245	1.317	0.808	0.88

28 of 28 sizes shown.

ASME B18.2.2 sizes

9 diameters · weight and hole sizes live on each size page

1/4-20 UNC 5/16-18 UNC 3/8-16 UNC 7/16-14 UNC 1/2-13 UNC 5/8-11 UNC 3/4-10 UNC 7/8-9 UNC 1-8 UNC All 9 sizes in this family →

What we supply to ASME B18.2.2

1 materials

Material	Property class	Finish
Carbon Steel	Grade 2 · Grade 5	Zinc Plated · Plain · Hot Dip Galvanized

Equivalents and mating parts

ASME B1.1-2024 →ASTM A563 →ASTM F594 →Hex nuts and hex jam nuts — inch series (Table 1.1.1-5 profile) sizes and weights →

To ASME B18.2.2Hex Jam Nut ASME B18.2.2

Quote against ASME B18.2.2

Standard, size, material, finish, quantity and destination are enough to begin.

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