Nut Dimensions - Boulons Plus

Nut Dimentions Reference Guide

You can use our reference tables shown below to find standard dimensions related to the type of nuts you are looking for.

Standard Hex Nuts

Nominal Size	F			C		H			Weight Per 100 nuts
	Width Across Flats			Width Across Corners		Thickness
	Basic	Max	Min	Max	Min	Basic	Max	Min
1/4	7/16	0.438	0.428	0.505	0.488	7/32	0.226	0.212	0.735
5/16	1/2	0.500	0.489	0.577	0.557	17/64	0.273	0.258	1.10
3/8	9/16	0.562	0.551	0.650	0.628	21/64	0.337	0.320	1.60
1/2	3/4	0.750	0.736	0.866	0.840	7/16	0.448	0.427	3.75
5/8	15/16	0.938	0.922	1.083	1.051	35/64	0.559	0.535	7.33
3/4	1-1/8	1.125	1.088	1.299	1.240	41/64	0.665	0.617	1.19
7/8	1-5/16	1.312	1.269	1.516	1.447	3/4	0.776	0.724	1.90
1	1-1/2	1.500	1.450	1.732	1.653	55/64	0.887	0.831	2.83
1-1/8	1-11/16	1.688	1.631	1.949	1.859	31/32	0.999	0.939	4.03
1-1/4	1-7/8	1.875	1.812	2.165	2.066	1-1/16	1.094	1.030	5.43
1-3/8	2-1/16	2.062	1.994	2.382	2.273	1-11/64	1.206	1.138	7.30
1-1/2	2-1/4	2.250	2.175	2.598	2.480	1-9/32	1.317	1.245	9.43

Nominal Size	F			C		H			Weight Per 100 nuts
	Width Across Flats			Width Across Corners		Thickness
	Basic	Max	Min	Max	Min	Basic	Max	Min
1/4	1/2	0.500	0.488	0.577	0.556	15/64	0.250	0.218	1.00
5/16	9/16	0.562	0.546	0.650	0.622	16/64	0.341	0.280	2.00
3/8	11/16	0.688	0.669	0.794	0.763	23/64	0.377	0.341	3.00
1/2	7/8	0.875	0.850	1.010	0.969	31/64	0.504	0.464	7.00
5/8	1 1/16	1.062	1.031	1.227	1.175	39/64	0.631	0.587	12.00
3/4	1 1/4	1.250	1.212	1.443	1.382	47/64	0.758	0.710	20.00
7/8	1 7/16	1.438	1.394	1.660	1.589	54/64	0.885	0.833	30.00
1	1 5/8	1.625	1.575	1.876	1.796	63/64	1.012	0.956	43.00
1 1/8	1 13/16	1.812	1.756	2.093	2.002	1 7/64	1.139	1.079	59.00
1 1/4	2	2.000	1.938	2.309	2.209	1 7/32	1.251	1.187	79.00
1 3/8	2 3/16	2.188	2.119	2.526	2.416	1 11/32	1.378	1.310	102.00
1 1/2	2 3/8	2.375	2.300	2.742	2.622	1 15/32	1.505	1.433	131.00
1 5/8	2 9/16	2.562	2.481	2.959	2.828	1 19/32	1.632	1.556	162.00
1 3/4	2 3/4	2.750	2.662	3.175	3.035	1 23/32	1.759	1.679	204.00
1 7/8	2 15/16	2.938	2.844	3.392	3.242	1 27/32	1.886	1.802	241.00
2	3 1/8	3.125	3.025	3.608	3.449	1 31/32	2.013	1.925	299.00
2 1/4	3 1/2	3.500	3.388	4.041	3.862	2 13/64	2.251	2.155	419.00
2 1/2	3 7/8	3.875	3.750	4.474	4.275	2 29/64	2.505	2.401	564.00
2 3/4	4 1/4	4.250	4.112	4.907	4.688	2 45/64	2.759	2.647	738.00
3	4 5/8	4.625	4.475	5.340	5.102	2 61/64	3.013	2.893	950.00
3 1/4	5	5.00	4.838	5.774	5.514	3 3/16	3.252	3.124	1194.00
3 1/2	5 3/8	5.375	5.200	6.207	5.928	3 7/16	3.506	3.370	1526.00
3 3/4	5 3/4	5.750	5.562	6.640	6.341	3 11/16	3.760	3.616	1812.00
4	6 1/8	6.125	5.925	7.073	6.755	3 15/16	4.014	3.862	2180.00

This table is inspired by Table 3 from ASME B18.2.6 standard

Standard Jam Nuts

Nominal Size	F			C		H			Weight Per 100 nuts
	Width Across Flats			Width Across Corners		Thickness
	Basic	Max	Min	Max	Min	Basic	Max	Min
3/8	9/16	0.562	0.551	0.650	0.628	7/32	0.227	0.210	1.05
1/2	3/4	0.750	0.736	0.866	0.840	5/16	0.323	0.302	2.62
5/8	15/16	0.938	0.922	1.083	1.051	3/8	0.387	0.363	4.93
3/4	1-1/8	1.125	1.088	1.299	1.240	27/64	0.446	0.398	7.70
7/8	1-5/16	1.312	1.269	1.516	1.447	31/64	0.510	0.458	12.00
1	1-1/2	1.500	1.450	1.732	1.653	35/64	0.575	0.519	17.60
1-1/8	1-11/16	1.688	1.631	1.949	1.859	39/64	0.639	0.579	24.70
1-1/4	1-7/8	1.875	1.812	2.165	2.066	23/32	0.751	0.687	36.10
1-3/8	2-1/16	2.062	1.994	2.382	2.273	25/32	0.815	0.747	47.90
1-1/2	2-1/4	2.250	2.175	2.598	2.480	27/32	0.880	0.808	60.90

Nylon Lock Nuts

Nominal Size	F			C	H		Weight Per 100 nuts
	Width Across Flats			Width Across Corners	Thickness
	Basic	Max	Min	Ref	Max	Min
#2	1/4	.251	.243	.268	.153	.133	0.13
#3	1/4	.251	.243	.268	.153	.133	0.12
#4	1/4	.251	.243	.268	.153	.133	0.14
#5	1/4	.251	.243	.268	.153	.133	0.22
#6	5/16	.313	.305	.339	.188	.168	0.30
#8	11/32	.345	.336	.374	.239	.219	0.40
#10	3/8	.376	.367	.410	.249	.229	0.50
#12	7/16	.439	.430	.482	.328	.298	0.81
1/4	7/16	.439	.430	.482	.328	.298	0.82
5/16	1/2	.502	.492	.552	.359	.329	1.17
3/8	9/16	.564	.553	.622	.468	.438	0.88
7/16	5/8	.627	.616	.698	.468	.438	0.55
1/2	3/4	.752	.741	.837	.609	.579	4.00
9/16	7/8	.877	.865	.978	.656	.626	1.37
5/8	15/16	.940	.928	1.051	.765	.735	7.00
3/4	1-1/8	1.064	1.052	1.191	.890	.860	12.00
7/8	1-5/16	1.252	1.239	1.403	.999	.969	19.00
1	1-1/2	1.440	1.427	1.615	1.078	1.016	28.00
1-1/8	1-11/16	1.627	1.614	1.826	1.203	1.141	40.00
1-1/4	1-7/8	1.815	1.801	2.038	1.422	1.360	54.00
1-1/2	2-1/4	2.197	2.159	2.444	1.640	1.578	94.00

Standard Hex Coupling Nuts

Nominal Size	F			C		H
	Width Across Flats			Width Across Corners		Length/Thickness
	Basic	Max	Min	Max	Min	Basic	Max	Min
1/2	11/16	0.688	0.663	0.794	0.756	1 3/4	1.760	1.690
5/8	13/16	0.813	0.782	0.939	0.891	2 1/8	2.135	2.067
3/4	1	1.000	0.963	1.155	1.097	2 1/4	2.260	2.190
7/8	1 1/4	1.250	1.212	1.43	1.382	2 1/2	2.510	2.440
1	1 3/8	1.375	1.325	1.588	1.511	2 3/4	2.760	2.690
1 1/8	1 1/2	1.500	1.450	1.732	1.653	3	3.010	2.940
1 1/4	1 5/8	1.625	1.575	1.876	1.825	3	3.010	2.940
1 1/2	2	1.950	1.950	2.309	2.275	3 1/2	3.510	3.440

Dimensions per ASME B18.2.2 2010. Some dimensions may vary by supplier

Heavy Hex Coupling Nuts

Nominal Size	F			C		H
	Width Across Flats			Width Across Corners		Thickness
	Basic	Max	Min	Max	Min	Basic	Max	Min
1⁄2	7⁄8	0.875	0.850	1.010	0.969	11⁄2	-	-
5⁄8	11⁄16	1.062	1.031	1.227	1.175	17⁄8	-	-
3⁄4	11⁄4	1.250	1.212	1.443	1.382	21⁄4	-	-
7⁄8	17⁄16	1.438	1.394	1.660	1.589	25⁄8	-	-
1	15⁄8	1.625	1.575	1.876	1.796	3	-	-
11⁄8	113⁄16	1.812	1.756	2.093	2.002	33⁄8	-	-
11⁄4	2	2.000	1.938	2.309	2.209	33⁄4	-	-
11⁄2	23⁄8	2.375	2.300	2.742	2.622	41⁄2	-	-
15⁄8	29⁄16	2.562	2.481	2.959	2.828	47⁄8	4.91	4.83
13⁄4	23⁄4	2.750	2.662	3.175	3.035	51⁄4	5.29	5.21
17⁄8	215⁄16	2.938	2.844	3.392	3.242	55⁄8	5.67	5.58
2	31⁄8	3.125	3.025	3.608	3.449	6	6.04	5.95
21⁄4	31⁄2	3.500	3.388	4.041	3.862	63⁄4	6.80	6.70
21⁄2	37⁄8	3.875	3.750	4.474	4.275	71⁄2	7.55	7.44
23⁄4	41⁄4	4.250	4.112	4.907	4.688	81⁄4	8.31	8.19
3	45⁄8	4.625	4.475	5.340	5.102	9	9.06	8.94
31⁄4	5	5.000	4.838	5.774	5.515	93⁄4	9.81	9.68
31⁄2	53⁄8	5.375	5.200	6.207	5.928	101⁄2	10.57	10.43
33⁄4	53⁄4	5.750	5.562	6.640	6.341	111⁄4	11.32	11.17
4	61⁄8	6.125	5.925	7.073	6.755	12	12.08	11.92
41⁄2	67⁄8	6.875	6.650	7.939	7.581	131⁄2	-	-
5	75⁄8	7.625	7.375	8.805	8.408	15	-	-

Heavy coupler dimensions are not defined by ASME 18.2.2. The width across the flats and corners match the dimensions of a heavy hex nut

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