ASME B18.2.2 Hex Thick Nuts

ASME B18.2.2 Hex Thick Nuts Standard covers the dimensional requirements for nine product types of inch series bolts and screws recognized as American National Standard. Also included are appendices covering gaging procedures, grade markings for bolts and screws, formulas on which dimensional data are based, and a specification to assist in identifying a product as being a screw or a bolt. Where questions arise concerning acceptance of product, the dimensions in the tables shall govern over recalculation by formula. Heavy hex structural bolts, formerly covered in ASME B18.2.1, are now covered in ASME B18.2.6.
The inclusion of dimensional data in this Standard is not intended to imply that all of the products described herein are stock production sizes. Consumers should consult with suppliers concerning lists of stock production sizes.

ASME B18.2.2 Hex Thick Nuts Dimensions (mm)

Nominal Size (in)	Basic Major Diameter	Width Across Flats, F			Width Across Corners, G		Thickness, H			Max Runout, FIM
		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

ASME B18.2.2 Hex Thick Nuts Dimensions (Inch)

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
		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