ASME B18.2.2 Hex Thick Nuts

Nominal Size (in)	Basic Major Diameter	Width Across Flats, F			Width Across Corners, G		Thickness, H			Max Runout, FIM
Nominal Size (in)	Basic Major Diameter	Basic	Min.	Max.	Min.	Max.	Basic	Min.	Max.	Up to 150k psi	150k+ psi
1/4	6.350	11.11	10.87	11.13	12.40	12.83	5.56	6.96	7.32	0.38	0.25
5/16	7.938	12.70	12.42	12.70	14.15	14.66	8.33	8.13	8.53	0.41	0.28
3/8	9.525	14.29	14.00	14.27	15.95	16.51	10.32	10.11	10.54	0.43	0.30
7/16	11.113	17.46	17.15	17.48	19.51	20.17	11.51	11.28	11.76	0.46	0.33
1/2	12.700	19.05	18.69	19.05	21.34	22.00	14.29	14.02	14.55	0.48	0.36
9/16	14.288	22.23	21.87	22.23	22.66	25.65	15.48	15.19	15.77	0.51	0.38
5/8	15.875	23.81	23.42	23.83	26.70	27.51	18.26	17.93	18.57	0.53	0.41
3/4	19.050	28.58	27.64	28.58	31.50	32.99	20.64	20.27	21.01	0.58	0.46
7/8	22.225	33.34	32.23	33.32	36.75	38.51	23.02	22.61	23.42	0.64	0.51
1	25.400	38.10	36.83	38.10	41.99	43.99	25.40	24.94	25.86	0.69	0.56
1 1/8	28.575	42.86	41.43	42.88	47.22	49.50	29.37	28.85	29.87	0.76	0.64
1 1/4	31.750	47.63	46.02	47.63	52.48	54.99	31.75	31.19	32.31	0.84	0.71
1 3/8	34.925	52.39	50.65	52.37	57.73	60.50	34.93	34.32	35.53	0.91	0.79
1 1/2	38.100	57.15	55.25	57.15	62.99	65.99	38.10	37.44	38.76	0.99	0.86

Nominal Size	Basic Major Diameter of Thread	Width Across Flats, F			Width Across Corners, G		Thickness, H			Maximum Runout of Bearing Surface to Thread Axis, FIM
Nominal Size	Basic Major Diameter of Thread	Basic	Min.	Max.	Min.	Max.	Basic	Min.	Max.	Up to 150,000 psi	150,000 psi and Greater
1/4	0.2500	7/16	0.428	0.438	0.488	0.505	7/32	0.274	0.288	0.015	0.010
5/16	0.3125	1/2	0.489	0.500	0.557	0.577	21/64	0.320	0.336	0.016	0.011
3/8	0.3750	9/16	0.551	0.562	0.628	0.650	13/32	0.398	0.415	0.017	0.012
7/16	0.4375	11/16	0.675	0.688	0.768	0.794	29/64	0.444	0.463	0.018	0.013
1/2	0.5000	3/4	0.736	0.750	0.840	0.866	9/16	0.552	0.573	0.019	0.014
9/16	0.5625	7/8	0.861	0.875	0.892	1.010	39/64	0.598	0.621	0.020	0.015
5/8	0.6250	15/16	0.922	0.938	1.051	1.083	23/32	0.706	0.731	0.021	0.016
3/4	0.7500	1 1/8	1.088	1.125	1.240	1.299	13/16	0.798	0.827	0.023	0.018
7/8	0.8750	1 5/16	1.269	1.312	1.447	1.516	29/32	0.890	0.922	0.025	0.020
1	1.0000	1 1/2	1.450	1.500	1.653	1.732	1	0.982	1.018	0.027	0.022
1 1/8	1.1250	1 11/16	1.631	1.688	1.859	1.949	1 5/32	1.136	1.176	0.030	0.025
1 1/4	1.2500	1 7/8	1.812	1.875	2.066	2.165	1 1/4	1.228	1.272	0.033	0.028
1 3/8	1.3750	2 1/16	1.994	2.062	2.273	2.382	1 3/8	1.351	1.399	0.036	0.031
1 1/2	1.5000	2 1/4	2.175	2.250	2.480	2.598	1 1/2	1.474	1.526	0.039	0.034