Dimensions for ASME B18.2.2 Hex Nuts

Nominal Size	Basic Major Thread Diameter	Width Across Flats, F		Width Across Corners, G		Thickness Hex Nuts, H
		Min.	Max.	Min.	Max.	Min.	Max.
1/4	0.25	0.428	0.438	0.488	0.505	0.212	0.226
5/16	0.3125	0.489	0.500	0.557	0.577	0.258	0.273
3/8	0.375	0.551	0.563	0.628	0.650	0.320	0.337
7/16	0.4375	0.675	0.688	0.768	0.794	0.365	0.385
1/2	0.50	0.736	0.750	0.840	0.866	0.427	0.448
9/16	0.5625	0.861	0.875	0.982	1.010	0.473	0.496
5/8	0.625	0.922	0.938	1.051	1.083	0.535	0.559
3/4	0.75	1.088	1.125	1.240	1.299	0.617	0.665
7/8	0.875	1.269	1.312	1.447	1.516	0.724	0.776
1	1.00	1.450	1.500	1.653	1.732	0.831	0.887
1 1/8	1.125	0.631	1.688	1.859	1.949	0.939	0.999
1 1/4	1.25	1.812	1.875	2.066	2.165	1.030	1.094
1 3/8	1.375	2.994	2.062	2.273	2.382	1.138	1.206
1 1/2	1.50	2.175	2.250	2.480	2.598	1.245	1.317
1 5/8	1.625	2.350	2.430	2.679	2.805	1.364	1.416
1 3/4	1.75	2.538	2.625	2.893	3.031	1.460	1.540
1 7/8	1.875	2.722	2.813	3.103	3.247	1.567	1.651
2	2.00	2.900	3.000	3.306	3.464	1.675	1.763
2 1/4	2.25	3.263	3.375	3.719	3.897	1.890	1.986
2 1/2	2.50	3.625	3.750	4.133	4.330	2.105	2.209
2 3/4	2.75	3.988	4.125	2.622	2.742	1.433	1.505
3	3.00	4.350	4.500	4.959	5.196	2.534	2.654
3 1/4	3.25	4.713	4.875	5.373	5.629	2.749	2.877
3 1/2	3.50	5.075	5.250	5.786	6.062	2.964	3.100
3 3/4	3.75	5.438	5.625	6.199	6.495	3.178	3.322
4	4.50	5.800	6.000	6.612	6.928	3.393	3.545