ASME B18.2.2 Hex Slotted Nuts

ASME B18.2.2 Hex Slotted 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 Slotted Nuts Dimensions (mm)

Nominal Size	Basic Major Diameter of Thread	Width Across Flats, F			Width Across Corners, G		Thickness, H			Unslotted Thickness, T		Width of Slot, S		Maximum Runout of Bearing Surface to Thread Axis, FIM
		Basic	Min.	Max.	Min.	Max.	Basic	Min.	Max.	Min.	Max.	Min.	Max.
1/4	6.350	11.113	10.871	11.125	12.395	12.827	7.144	6.960	7.315	4.572	5.080	1.778	2.540	0.381
5/16	7.938	12.700	12.421	12.700	14.148	14.656	8.334	8.128	8.534	5.588	6.096	2.286	3.048	0.406
3/8	9.525	14.288	13.995	14.275	15.951	16.510	10.319	10.109	10.541	6.858	7.366	3.048	3.810	0.432
7/16	11.113	17.463	17.145	17.475	19.507	20.168	11.509	11.278	11.760	7.366	7.874	3.048	3.810	0.457
1/2	12.700	19.050	18.694	19.050	21.336	21.996	14.288	14.021	14.554	10.160	10.668	3.810	4.572	0.483
9/16	14.288	22.225	21.869	22.225	24.943	25.654	15.478	15.189	15.773	10.414	10.922	3.810	4.572	0.508
5/8	15.875	23.813	23.419	23.825	26.695	27.508	18.256	17.932	18.567	12.446	12.954	4.572	6.096	0.533
3/4	19.050	28.575	27.635	28.575	31.496	32.995	20.638	20.269	21.006	13.970	14.478	4.572	6.096	0.584
7/8	22.225	33.338	32.233	33.325	36.754	38.506	23.019	22.606	23.419	16.256	17.018	4.572	6.096	0.635
1	25.400	38.100	36.830	38.100	41.986	43.993	25.400	24.943	25.857	17.780	18.542	6.096	7.620	0.686
1 1/8	28.575	42.863	41.427	42.875	47.219	49.505	29.369	28.854	29.870	20.320	21.082	6.096	8.382	0.762
1 1/4	31.750	47.625	46.025	47.625	52.476	54.991	31.750	31.191	32.309	21.844	22.606	7.874	10.160	0.838
1 3/8	34.925	52.388	50.648	52.375	57.734	60.503	34.925	34.315	35.535	24.892	25.908	7.874	10.160	0.914
1 1/2	38.100	57.150	55.245	57.150	62.992	65.989	38.100	37.440	38.760	26.416	27.432	9.398	11.684	0.991

ASME B18.2.2 Hex Slotted Nuts Dimensions (Inch)

Nominal Size	Basic Major Diameter of Thread	Width Across Flats, F			Width Across Corners, G		Thickness, H			Unslotted Thickness, T		Width of Slot, S		Maximum Runout of Bearing Surface to Thread Axis, FIM
		Basic	Min.	Max.	Min.	Max.	Basic	Min.	Max.	Min.	Max.	Min.	Max.
1/4	0.2500	7/16	0.428	0.438	0.488	0.505	9/32	0.274	0.288	0.18	0.20	0.07	0.10	0.015
5/16	0.3125	1/2	0.489	0.500	0.557	0.577	21/64	0.320	0.336	0.22	0.24	0.09	0.12	0.016
3/8	0.3750	9/16	0.551	0.562	0.628	0.650	13/32	0.398	0.415	0.27	0.29	0.12	0.15	0.017
7/16	0.4375	11/16	0.675	0.688	0.768	0.794	29/64	0.444	0.463	0.29	0.31	0.12	0.15	0.018
1/2	0.5000	3/4	0.736	0.750	0.840	0.866	9/16	0.552	0.573	0.40	0.42	0.15	0.18	0.019
9/16	0.5625	7/8	0.861	0.875	0.982	1.010	39/64	0.598	0.621	0.41	0.43	0.15	0.18	0.020
5/8	0.6250	15/16	0.922	0.938	1.051	1.083	23/32	0.706	0.731	0.49	0.51	0.18	0.24	0.021
3/4	0.7500	1 1/8	1.088	1.125	1.240	1.299	13/16	0.798	0.827	0.55	0.57	0.18	0.24	0.023
7/8	0.8750	1 5/16	1.269	1.312	1.447	1.516	29/32	0.890	0.922	0.64	0.67	0.18	0.24	0.025
1	1.0000	1 1/2	1.450	1.500	1.653	1.732	1	0.982	1.018	0.70	0.73	0.24	0.30	0.027
1 1/8	1.1250	1 11/16	1.631	1.688	1.859	1.949	1 5/32	1.136	1.176	0.80	0.83	0.24	0.33	0.030
1 1/4	1.2500	1 7/8	1.812	1.875	2.066	2.165	1 1/4	1.228	1.272	0.86	0.89	0.31	0.40	0.033
1 3/8	1.3750	2 1/16	1.994	2.062	2.273	2.382	1 3/8	1.351	1.399	0.98	1.02	0.31	0.40	0.036
1 1/2	1.5000	2 1/4	2.175	2.250	2.480	2.598	1 1/2	1.474	1.526	1.04	1.08	0.37	0.46	0.039