ASME B18.2.2 Hex Jam Nuts

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

Nominal Size	Basic Major Diameter of Thread	Width Across Flats, F		Width Across Corners, G		Thickness, H1		Runout
		Min	Max	Min	Max	Min	Max	Max
1/4	6.350	10.871	11.125	12.395	12.827	3.810	4.140	0.381
5/16	7.938	12.421	12.700	14.148	14.656	4.572	4.953	0.406
3/8	9.525	13.995	14.300	15.951	16.510	5.334	5.766	0.432
7/16	11.113	17.145	17.475	19.507	20.168	6.096	6.604	0.457
1/2	12.700	18.694	19.050	21.336	21.996	7.671	8.204	0.483
9/16	14.288	21.869	22.225	24.943	25.654	7.645	8.230	0.508
5/8	15.875	23.419	23.825	26.695	27.508	9.220	9.830	0.533
3/4	19.050	27.635	28.575	31.496	32.995	10.109	11.328	0.584
7/8	22.225	32.233	33.325	36.754	38.506	11.633	12.954	0.635
1	25.400	36.830	38.100	41.986	43.993	13.183	14.605	0.686
1 1/8	28.575	41.427	42.875	47.219	49.505	14.707	16.231	0.762
1 1/4	31.750	46.025	47.625	52.476	54.991	17.450	19.075	0.838
1 3/8	34.925	50.648	52.375	57.734	60.503	18.974	20.701	0.914
1 1/2	38.100	55.245	57.150	62.992	65.989	20.523	22.352	0.991
1 5/8	41.275	59.690	61.722	68.047	71.247	22.047	23.978	1.118
1 3/4	44.450	64.465	66.675	73.482	76.987	23.597	25.629	1.219
1 7/8	47.625	69.139	71.450	78.816	82.474	25.121	27.254	1.295
2	50.800	73.660	76.200	83.972	87.986	26.670	28.905	1.397
2 1/4	57.150	82.880	85.725	94.463	98.984	29.337	32.182	1.549
2 1/2	63.500	92.075	95.250	104.978	109.982	35.585	36.246	1.727
2 3/4	69.850	101.295	104.775	115.468	120.980	38.659	39.522	1.880
3	76.200	110.490	114.300	125.959	131.978	41.732	42.799	2.057
3 1/4	82.550	119.710	123.825	136.474	142.977	44.399	46.076	2.210
3 1/2	88.900	128.905	133.350	146.964	153.975	47.498	49.352	2.388
3 3/4	95.250	138.125	142.875	157.455	164.973	50.546	52.629	2.540
4	101.600	147.320	152.400	167.945	175.971	53.645	55.905	2.718

ASME B18.2.2 Hex Jam Nuts Dimensions (Inch)

Nominal Size	Basic Major Diameter of Thread	Width Across Flats, F		Width Across Corners, G		Thickness, H1		Runout
		Min	Max	Min	Max	Min	Max	Max
1/4	0.2500	0.428	0.438	0.488	0.505	0.150	0.163	0.015
5/16	0.3125	0.489	0.500	0.557	0.577	0.180	0.195	0.016
3/8	0.3750	0.551	0.563	0.628	0.650	0.210	0.227	0.017
7/16	0.4375	0.675	0.688	0.768	0.794	0.240	0.260	0.018
1/2	0.5000	0.736	0.750	0.840	0.866	0.302	0.323	0.019
9/16	0.5625	0.861	0.875	0.982	1.010	0.301	0.324	0.020
5/8	0.6250	0.922	0.938	1.051	1.083	0.363	0.387	0.021
3/4	0.7500	1.088	1.125	1.240	1.299	0.398	0.446	0.023
7/8	0.8750	1.269	1.312	1.447	1.516	0.458	0.510	0.025
1	1.0000	1.450	1.500	1.653	1.732	0.519	0.575	0.027
1 1/8	1.1250	1.631	1.688	1.859	1.949	0.579	0.639	0.030
1 1/4	1.2500	1.812	1.875	2.066	2.165	0.687	0.751	0.033
1 3/8	1.3750	1.994	2.062	2.273	2.382	0.747	0.815	0.036
1 1/2	1.5000	2.175	2.250	2.480	2.598	0.808	0.880	0.039
1 5/8	1.6250	2.35	2.43	2.679	2.805	0.868	0.944	0.044
1 3/4	1.7500	2.538	2.625	2.893	3.031	0.929	1.009	0.048
1 7/8	1.8750	2.722	2.813	3.103	3.247	0.989	1.073	0.051
2	2.0000	2.900	3.000	3.306	3.464	1.050	1.138	0.055
2 1/4	2.2500	3.263	3.375	3.719	3.897	1.155	1.267	0.061
2 1/2	2.5000	3.625	3.750	4.133	4.330	1.401	1.427	0.068
2 3/4	2.7500	3.988	4.125	4.546	4.763	1.522	1.556	0.074
3	3.0000	4.350	4.500	4.959	5.196	1.643	1.685	0.081
3 1/4	3.2500	4.713	4.875	5.373	5.629	1.748	1.814	0.087
3 1/2	3.5000	5.075	5.250	5.786	6.062	1.870	1.943	0.094
3 3/4	3.7500	5.438	5.625	6.199	6.495	1.990	2.072	0.100
4	4.0000	5.800	6.000	6.612	6.928	2.112	2.201	0.107