ASME B18.2.2 Heavy Hex Nuts

ASME B18.2.2 Heavy Hex 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 Heavy Hex Nut Dimensions (mm)

Nominal Size	Basic Major Diameter	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 150k psi	150k psi +
1/4	6.350	12.700	12.395	12.700	14.122	14.656	5.953	5.537	6.350	0.432	0.279
5/16	7.938	14.288	13.868	14.275	15.799	16.510	7.541	7.112	7.976	0.508	0.305
3/8	9.525	17.463	16.993	17.475	19.380	20.168	9.128	8.661	9.576	0.533	0.356
7/16	11.113	19.050	18.491	19.050	21.082	21.996	10.716	10.236	11.201	0.559	0.381
1/2	12.700	22.225	21.590	22.225	24.613	25.654	12.303	11.786	12.802	0.584	0.406
9/16	14.288	23.813	23.089	23.825	26.340	27.508	13.891	13.360	14.427	0.610	0.432
5/8	15.875	26.988	26.187	26.975	29.845	31.166	15.478	14.910	16.027	0.635	0.457
3/4	19.050	31.750	30.785	31.750	35.103	36.652	18.653	18.034	19.253	0.686	0.508
7/8	22.225	36.513	35.408	36.525	40.361	42.164	21.828	21.158	22.479	0.737	0.559
1	25.400	41.275	40.005	41.275	45.618	47.650	25.003	24.282	25.705	0.787	0.610
1 1/8	28.575	46.038	44.602	46.025	50.851	53.162	28.178	27.407	28.931	0.838	0.686
1 1/4	31.750	50.800	49.225	50.800	56.109	58.649	31.353	30.150	31.775	0.889	0.762
1 3/8	34.925	55.563	53.823	55.575	61.366	64.160	34.528	33.274	35.001	0.965	0.838
1 1/2	38.100	60.325	58.420	60.325	66.599	69.647	37.703	36.398	38.227	1.041	0.914
1 5/8	41.275	65.088	63.017	65.075	71.831	75.159	40.878	39.522	41.453	1.118	0.965
1 3/4	44.450	69.850	67.615	69.850	77.089	80.645	44.053	42.647	44.679	1.219	1.041
1 7/8	47.625	74.613	72.238	74.625	82.347	86.157	47.228	45.771	47.904	1.295	1.118
2	50.800	79.375	76.835	79.375	87.605	91.643	50.403	48.895	51.130	1.397	1.194
2 1/4	57.150	88.900	86.055	88.900	98.095	102.641	56.753	54.737	57.175	1.549	1.321
2 1/2	63.500	98.425	95.250	98.425	108.585	113.640	63.103	60.985	63.627	1.727	1.473
2 3/4	69.850	107.950	104.445	107.950	119.075	124.638	69.453	67.234	70.079	1.880	1.626
3	76.200	117.475	113.665	117.475	129.591	135.636	75.803	73.482	76.530	2.057	1.778
3 1/4	82.550	127.000	122.885	127.000	140.081	146.660	81.756	79.350	82.601	2.210	1.905
3 1/2	88.900	136.525	132.080	136.525	150.571	157.658	88.106	85.598	89.052	2.388	2.057
3 3/4	95.250	146.050	141.275	146.050	161.061	168.656	94.456	91.846	95.504	2.540	2.210
4	101.600	155.575	150.495	155.575	171.577	179.654	100.806	98.095	101.956	2.718	2.362

ASME B18.2.2 Heavy Hex Nut Dimensions (Inch)

Nominal Size	Basic Major Diameter	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 150k psi	150k psi +
1/4	0.2500	1/2	0.488	0.500	0.556	0.577	15/64	0.218	0.250	0.017	0.011
5/16	0.3125	9/16	0.546	0.562	0.622	0.650	19/64	0.280	0.314	0.020	0.012
3/8	0.3750	11/16	0.669	0.688	0.763	0.794	23/64	0.341	0.377	0.021	0.014
7/16	0.4375	3/4	0.728	0.750	0.830	0.866	27/64	0.403	0.441	0.022	0.015
1/2	0.5000	7/8	0.850	0.875	0.969	1.010	31/64	0.464	0.504	0.023	0.016
9/16	0.5625	15/16	0.909	0.938	1.037	1.083	35/64	0.526	0.568	0.024	0.017
5/8	0.6250	1 1/16	1.031	1.062	1.175	1.227	39/64	0.587	0.631	0.025	0.018
3/4	0.7500	1 1/4	1.212	1.250	1.382	1.443	47/64	0.710	0.758	0.027	0.020
7/8	0.8750	1 7/16	1.394	1.438	1.589	1.660	55/64	0.833	0.885	0.029	0.022
1	1.0000	1 5/8	1.575	1.625	1.796	1.876	63/64	0.956	1.012	0.031	0.024
1 1/8	1.1250	1 13/16	1.756	1.812	2.002	2.093	1 7/64	1.079	1.139	0.033	0.027
1 1/4	1.2500	2	1.938	2.000	2.209	2.309	1 7/32	1.187	1.251	0.035	0.030
1 3/8	1.3750	2 3/16	2.119	2.188	2.416	2.526	1 11/32	1.310	1.378	0.038	0.033
1 1/2	1.5000	2 3/8	2.300	2.375	2.622	2.742	1 15/32	1.433	1.505	0.041	0.036
1 5/8	1.6250	2 9/16	2.481	2.562	2.828	2.959	1 19/32	1.556	1.632	0.044	0.038
1 3/4	1.7500	2 3/4	2.662	2.750	3.035	3.175	1 23/32	1.679	1.759	0.048	0.041
1 7/8	1.8750	2 15/16	2.844	2.938	3.242	3.392	1 27/32	1.802	1.886	0.051	0.044
2	2.0000	3 1/8	3.025	3.125	3.449	3.608	1 31/32	1.925	2.013	0.055	0.047
2 1/4	2.2500	3 1/2	3.388	3.500	3.862	4.041	2 13/64	2.155	2.251	0.061	0.052
2 1/2	2.5000	3 7/8	3.750	3.875	4.275	4.474	2 29/64	2.401	2.505	0.068	0.058
2 3/4	2.7500	4 1/4	4.112	4.250	4.688	4.907	2 45/64	2.647	2.759	0.074	0.064
3	3.0000	4 5/8	4.475	4.625	5.102	5.340	2 61/64	2.893	3.013	0.081	0.070
3 1/4	3.2500	5	4.838	5.000	5.515	5.774	3 3/16	3.124	3.252	0.087	0.075
3 1/2	3.5000	5 3/8	5.200	5.375	5.928	6.207	3 7/16	3.370	3.506	0.094	0.081
3 3/4	3.7500	5 3/4	5.562	5.750	6.341	6.640	3 11/16	3.616	3.760	0.100	0.087
4	4.0000	6 1/8	5.925	6.125	6.755	7.073	3 15/16	3.862	4.014	0.107	0.093