Dimensions of Hex Jam Nuts

Nominal Size	Basic Major Diameter of Thread	Width Across Flats, F		Width Across Corners, G		Thickness Hex Jam Nuts, H1
		Min.	Max.	Min.	Max.	Min.	Max.
1/4	0.25	0.428	0.438	0.488	0.505	0.150	0.163
5/16	0.3125	0.489	0.500	0.557	0.577	0.180	0.195
3/8	0.375	0.551	0.563	0.628	0.650	0.210	0.227
7/16	0.4375	0.675	0.688	0.768	0.794	0.240	0.260
1/2	0.50	0.736	0.750	0.840	0.866	0.302	0.323
9/16	0.5625	0.861	0.875	0.982	1.010	0.301	0.324
5/8	0.625	0.922	0.938	1.051	1.083	0.363	0.387
3/4	0.75	1.088	1.125	1.240	1.299	0.398	0.446
7/8	0.875	1.269	1.312	1.447	1.516	0.458	0.510
1	1.00	1.450	1.500	1.653	1.732	0.519	0.575
1 1/8	1.125	0.631	1.688	1.859	1.949	0.579	0.639
1 1/4	1.25	1.812	1.875	2.066	2.165	0.687	0.751
1 3/8	1.375	2.994	2.062	2.273	2.382	0.747	0.815
1 1/2	1.50	2.175	2.250	2.480	2.598	0.808	0.880
1 5/8	1.625	2.350	2.430	2.679	2.805	0.868	0.944
1 3/4	1.75	2.538	2.625	2.893	3.031	0.929	1.009
1 7/8	1.875	2.722	2.813	3.103	3.247	0.989	1.009
2	2.00	2.900	3.000	3.306	3.464	1.105	1.138
2 1/4	2.25	3.263	3.375	3.719	3.897	1.155	1.267
2 1/2	2.50	3.625	3.750	4.133	4.330	1.401	1.427
2 3/4	2.75	3.988	4.125	2.622	2.742	0.808	0.880
3	3.00	4.350	4.500	4.959	5.196	1.643	1.685
3 1/4	3.25	4.713	4.875	5.373	5.629	1.748	1.814
3 1/2	3.50	5.075	5.250	5.786	6.062	1.870	1.943
3 3/4	3.75	5.438	5.625	6.199	6.495	1.990	2.072
4	4.50	5.800	6.000	6.612	6.928	2.112	2.201