ASME B18.2.1 Heavy Hex Bolts

Scope

ASME B18.2.1 Square Lag Screws dimension standard covers the dimensional requirements for product types of 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 Tables measurements are also converted into millimeters to make the information clearer and easier to to understand.

ASME B18.2.1 Heavy Hex Bolts Dimensions (mm)

Nominal Size or Basic Product Diameter		Full-Size Body Diameter, E		Width Across Flats, F			Width Across Corners, G		Head Height, H			Radius of Fillet, R		Nominal Thread Length, L_T
Nominal Size or Basic Product Diameter		Max.	Min.	Basic	Max.	Min.	Max.	Min.	Basic	Max.	Min.	Max.	Min.	152.4mm and Shorter	Over 152.4mm
3/8	9.525	9.855	9.144	17.463	17.475	16.993	20.168	19.380	6.350	6.807	5.740	0.762	0.254	25.400	31.750
1/2	12.700	13.081	12.243	22.225	22.225	21.590	25.654	24.613	8.731	9.246	7.671	0.762	0.254	31.750	38.100
5/8	15.875	16.307	15.367	26.988	26.975	26.187	31.166	29.845	10.716	11.278	9.601	1.524	0.508	38.100	44.450
3/4	19.050	19.507	18.517	31.750	31.750	30.785	36.652	35.128	12.700	13.310	11.557	1.524	0.508	44.450	50.800
7/8	22.225	22.733	21.641	36.513	36.525	35.408	42.164	40.361	14.684	15.342	13.487	1.524	0.508	50.800	57.150
1	25.400	25.959	24.790	41.275	41.275	40.005	47.650	45.618	17.066	17.780	15.011	2.286	0.762	57.150	63.500
1 1/8	28.575	29.185	27.889	46.038	46.025	44.602	53.162	50.851	19.050	19.812	16.713	2.286	0.762	63.500	69.850
1 1/4	31.750	32.436	31.064	50.800	50.800	49.225	58.649	56.109	21.431	22.250	19.025	2.286	0.762	69.850	76.200
1 3/8	34.925	35.662	34.163	55.563	55.575	53.823	64.160	61.366	23.019	23.876	20.574	2.286	0.762	76.200	82.550
1 1/2	38.100	38.887	37.338	60.325	60.325	58.420	69.647	66.599	25.400	26.314	22.911	2.286	0.762	82.550	88.900
1 5/8	41.275	42.113	40.411	65.088	65.075	63.017	75.159	71.857	27.781	28.346	24.841	2.286	0.762	88.900	95.250
1 3/4	44.450	45.339	43.586	69.850	69.850	67.615	80.645	77.089	29.369	30.378	26.772	3.048	1.016	95.250	101.600
1 7/8	47.625	48.565	46.711	74.613	74.625	72.238	86.157	82.347	31.750	32.410	28.702	3.048	1.016	101.600	107.950
2	50.800	51.791	49.886	79.375	79.375	76.835	91.643	87.605	34.131	35.255	29.845	3.048	1.016	107.950	114.300
2 1/4	57.150	58.547	56.236	88.900	88.900	86.055	102.641	98.095	38.100	39.319	33.706	4.826	1.524	120.650	127.000
2 1/2	63.500	64.999	62.509	98.425	98.425	95.250	113.640	108.585	42.069	43.383	37.567	4.826	1.524	133.350	139.700
2 3/4	69.850	71.806	68.859	107.950	107.950	104.445	124.638	119.075	46.038	47.473	41.453	4.826	1.524	146.050	152.400
3	76.200	78.257	75.209	117.475	117.475	113.665	135.636	129.591	50.800	52.324	46.101	4.826	1.524	158.750	165.100

ASME B18.2.1 Heavy Hex Bolts Length Tolerance (mm)

Nominal Length	Nominal Size (inches)
Nominal Length	1/4 to 3/8	7/16 and 1/2	9/16 to 3/4	7/8 and 1	1 1/8 to 1 1/2	Over 1 1/2
Up to 25.4 mm, incl.	+0.508 0.762	+0.508 0.762	+0.508 0.762	...	...	...
Over 25.4 mm to 63.5 mm, incl.	+0.508 1.016	+1.016 1.524	+1.524 2.032	+2.032 2.54	+3.048 3.048	+4.572 4.572
Over 63.5 mm to 101.6 mm, incl.	+1.016 1.524	+1.524 2.032	+2.032 2.54	+2.54 3.556	+4.064 4.064	+5.08 5.08
Over 101.6 mm to 152.4 mm, incl.	+1.524 2.54	+2.032 2.54	+2.54 2.54	+3.048 4.064	+4.572 4.572	+5.588 5.588
Longer than 152.4 mm	+2.54 4.572	+3.048 4.572	+3.556 4.572	+4.064 5.08	+5.588 5.588	+6.096 6.096

ASME B18.2.1 Heavy Hex Bolts Grip Gaging Lengths (mm)

Nominal Size	Nominal Length, Lg, max. / Lb, min.
	1-1/4		1-3/8		1-1/2		1-5/8		1-3/4		1-7/8		2		2-1/8		2-1/4		2-3/8		2-1/2		2-5/8		2-3/4		2-7/8		3		3-1/4		3-1/2		3-3/4		4		4-1/4		4-1/2		4-3/4		5		5-1/4		5-1/2		5-3/4		6		6-1/4		6-1/2		6-3/4		7		7-1/4		7-1/2		7-3/4		8		8-1/4		8-1/2		8-3/4		9		9-1/4		9-1/2		9-3/4		10		11		12
	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.
1/4	0.50	0.25	0.63	0.38	0.75	0.50	0.88	0.62	1.00	0.75	1.12	0.88	1.25	1.00	1.38	1.12	1.50	1.25	1.62	1.38	1.75	1.50	1.88	1.62	2.00	1.75	2.12	1.88	2.52	2.00	2.50	2.25	2.75	2.50	3.00	2.75	3.25	3.00	3.50	3.25	3.75	3.50	4.00	3.75	4.25	4.00	4.50	4.25	4.75	4.50	5.00	4.75	5.25	5.00	5.25	5.00	5.50	5.25	5.75	5.50	6.00	5.75	6.25	6.00	6.50	6.25	6.75	6.50	7.00	6.75	7.25	7.00	7.50	7.25	7.75	7.50	8.00	7.75	8.25	8.00	8.50	8.25	8.75	8.50	9.00	8.75	10.00	9.75	11.00	10.75
5/16	Full thread		0.50	0.22	0.62	0.35	0.75	0.47	0.88	0.60	1.00	0.72	1.12	0.85	1.25	0.97	1.38	1.10	1.50	1.22	1.62	1.35	1.75	1.47	1.88	1.60	2.00	1.72	2.12	1.85	2.38	2.10	2.62	2.35	2.88	2.60	3.12	2.85	3.38	3.10	3.62	3.35	3.88	3.60	4.12	3.85	4.38	4.10	4.62	4.35	4.88	4.60	5.12	4.85	5.12	4.85	5.38	5.10	5.62	5.35	5.88	5.60	6.12	5.85	6.38	6.10	6.62	6.35	6.88	6.60	7.12	6.85	7.38	7.10	7.62	7.35	7.88	7.60	8.12	7.85	8.38	8.10	8.62	8.35	8.88	8.60	9.88	9.60	10.88	10.60
3/8	Full thread		Full thread		0.50	0.19	0.62	0.31	0.75	0.44	0.88	0.56	1.00	0.69	1.12	0.81	1.25	0.94	1.38	1.06	1.50	1.19	1.62	1.31	1.75	1.44	1.88	1.56	2.00	1.69	2.25	1.94	2.50	2.19	2.75	2.44	3.00	2.69	3.25	2.94	3.50	3.19	3.75	3.44	4.00	3.69	4.25	3.94	4.50	4.19	4.75	4.44	5.00	4.69	5.00	4.69	5.25	4.94	5.50	5.19	5.75	5.44	6.00	5.69	6.25	5.94	6.50	6.19	6.75	6.44	7.00	6.69	7.25	6.94	7.50	7.19	7.75	7.44	8.00	7.69	8.25	7.94	8.50	8.19	8.75	8.44	9.75	9.44	10.75	10.44
7/16	Full thread		Full thread		Full thread		Full thread		0.63	0.27	0.75	0.39	0.88	0.52	1.00	0.64	1.12	0.77	1.25	0.89	1.38	1.02	1.50	1.14	1.62	1.27	1.75	1.39	1.88	1.52	2.12	1.77	2.38	2.02	2.62	2.27	2.88	2.52	3.12	2.77	3.38	3.02	3.62	3.27	3.88	3.52	4.12	3.77	4.38	4.02	4.63	4.27	4.88	4.52	4.88	4.52	5.12	4.77	5.38	5.02	5.62	5.27	5.88	5.52	6.12	5.77	6.38	6.02	6.62	6.27	6.88	6.52	7.12	6.77	7.38	7.02	7.62	7.27	7.88	7.52	8.12	7.77	8.38	8.02	8.62	8.27	9.62	9.27	10.62	10.27
1/2	Full thread		Full thread		Full thread		Full thread		Full thread		0.63	0.24	0.75	0.38	0.88	0.49	1.00	0.62	1.12	0.74	1.25	0.86	1.38	0.99	1.50	1.12	1.62	1.24	1.75	1.36	2.00	1.62	2.25	1.86	2.50	2.12	2.75	2.36	3.00	2.62	3.25	2.86	3.50	3.12	3.75	3.36	4.00	3.62	4.25	3.87	4.50	4.12	4.75	4.36	4.75	4.36	5.00	4.62	5.25	4.86	5.50	5.12	5.75	5.36	6.00	5.62	6.25	5.87	6.50	6.12	6.75	6.36	7.00	6.62	7.25	6.86	7.50	7.12	7.75	7.36	8.00	7.62	8.25	7.86	8.50	8.12	9.50	9.12	10.50	10.12
9/16	Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		0.75	0.33	0.88	0.45	1.00	0.58	1.12	0.75	1.25	0.83	1.38	0.96	1.50	1.08	1.62	1.21	1.88	1.46	2.12	1.71	2.38	1.96	2.62	2.21	2.88	2.46	3.12	2.71	3.38	2.96	3.62	3.21	3.88	3.46	4.12	3.71	4.38	3.96	4.62	4.21	4.62	4.21	4.88	4.46	5.12	4.71	5.38	4.96	5.62	5.20	5.88	5.46	6.12	5.71	6.38	5.96	6.62	6.21	6.88	6.46	7.12	6.71	7.38	6.96	7.62	7.21	7.88	7.46	8.12	7.71	8.38	7.96	9.38	8.96	10.38	9.96
5/8	Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		0.75	0.30	0.88	0.42	1.00	0.55	1.12	0.67	1.25	0.80	1.38	0.92	1.50	1.05	1.75	1.30	2.00	1.55	2.25	1.80	2.50	2.05	2.75	2.30	3.00	2.55	3.25	2.80	3.50	3.05	3.75	3.30	4.00	3.55	4.25	3.80	4.50	4.05	4.50	4.05	4.75	4.30	5.00	4.55	5.25	4.80	5.50	5.05	5.75	5.30	6.00	5.55	6.25	5.80	6.50	6.05	6.75	6.30	7.00	6.55	7.25	6.80	7.50	7.05	7.75	7.30	8.00	7.55	8.25	7.80	9.25	8.80	10.25	9.80
3/4	Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		1.12	0.67	1.25	0.80	1.38	0.92	1.50	1.05	1.50	1.00	1.75	1.25	2.00	1.50	2.25	1.75	2.50	2.00	2.75	2.25	3.00	2.50	3.25	2.75	3.50	3.00	3.75	3.25	4.00	3.50	4.25	3.75	4.25	3.75	4.50	4.00	4.75	4.25	5.00	4.50	5.25	4.75	5.50	5.00	5.75	5.25	6.00	5.50	6.25	5.75	6.50	6.00	6.75	6.25	7.00	6.50	7.25	6.75	7.50	7.00	7.75	7.25	8.00	7.50	9.00	8.50	10.00	9.50
7/8	Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		1.00	0.50	1.12	0.62	1.25	0.75	1.25	0.69	1.50	0.94	1.75	1.19	2.00	1.44	2.25	1.69	2.50	1.94	2.75	2.19	3.00	2.44	3.25	2.69	3.50	2.94	3.75	3.19	4.00	3.44	4.00	3.44	4.25	3.69	4.50	3.94	4.75	4.19	5.00	4.44	5.25	4.69	5.50	4.94	5.75	5.19	6.00	5.44	6.25	5.69	6.50	5.94	6.75	6.19	7.00	6.44	7.25	6.89	7.50	6.94	7.75	7.19	8.75	8.19	9.75	9.19
1	Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		0.88	0.32	1.00	0.44	1.00	0.38	1.25	0.62	1.50	0.88	1.75	1.12	2.00	1.38	2.25	1.62	2.50	1.88	2.75	2.12	3.00	2.38	3.25	2.62	3.50	2.88	3.75	3.12	3.75	3.12	4.00	3.38	4.25	3.63	4.50	3.88	4.75	4.12	5.00	4.38	5.25	4.52	5.50	4.88	5.75	5.12	6.00	5.38	6.25	5.62	6.50	5.88	6.75	6.12	7.00	6.38	7.25	6.62	7.50	6.88	8.50	7.88	9.50	8.88
1-1/8	Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		1.25	0.54	1.50	0.79	1.75	1.04	2.00	1.29	2.25	1.54	2.50	1.79	2.75	2.04	3.00	2.29	3.25	2.54	3.50	2.79	3.50	2.79	3.75	3.04	4.00	3.29	4.25	3.54	4.50	3.79	4.75	4.04	5.00	4.29	5.25	4.54	5.50	4.79	5.75	5.04	6.00	5.29	6.25	5.54	6.50	5.79	6.75	6.04	7.00	6.29	7.25	6.54	8.25	7.54	9.25	8.54
1-1/4	Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		1.25	0.54	1.50	0.79	1.75	1.04	2.00	1.29	2.25	1.54	2.50	1.79	2.75	2.04	3.00	2.29	3.25	2.54	3.25	2.54	3.50	2.79	3.75	3.04	4.00	3.29	4.25	3.54	4.50	3.79	4.75	4.04	5.00	4.29	5.25	4.54	5.50	4.79	5.75	5.04	6.00	5.29	6.25	5.54	6.50	5.79	6.75	6.04	7.00	6.29	8.00	7.29	9.00	8.29
1-3/8	Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		1.50	0.79	1.75	1.04	2.00	1.29	2.25	1.54	2.50	1.79	2.75	2.04	3.00	2.29	3.25	2.54	3.25	2.54	3.50	2.79	3.75	3.04	4.00	3.29	4.25	3.54	4.50	3.79	4.75	4.04	5.00	4.29	5.25	4.54	5.50	4.79	5.75	5.04	6.00	5.29	6.25	5.54	6.50	5.79	6.75	6.04	7.75	7.04	8.75	8.04
1-1/2	Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		1.50	0.67	1.75	0.92	2.00	1.17	2.25	1.42	2.50	1.67	2.75	1.92	2.75	1.92	3.00	2.17	3.25	2.42	3.50	2.67	3.75	2.92	4.00	3.17	4.25	3.42	4.50	3.67	4.75	3.92	5.00	4.17	5.25	4.42	5.50	4.67	5.75	4.92	6.00	5.17	6.25	5.42	6.50	5.67	7.50	6.67	8.50	7.67

ASME B18.2.1 Heavy Hex Bolts Dimensions (Inch)

Nominal Size or Basic Product Diameter		Full-Size Body Diameter, E		Width Across Flats, F			Width Across Corners, G		Head Height, H			Radius of Fillet, R		Nominal Thread Length for Bolt Lengths, L_T
Nominal Size or Basic Product Diameter		Max.	Min.	Basic	Max.	Min.	Max.	Min.	Basic	Max.	Min.	Max.	Min.	6 in. and Shorter	Over 6 in.
3/8	0.3750	0.388	0.360	11/16	0.688	0.669	0.794	0.763	1/4	0.268	0.226	0.03	0.01	1.000	1.250
1/2	0.5000	0.515	0.482	7/8	0.875	0.850	1.010	0.969	11/32	0.364	0.302	0.03	0.01	1.250	1.500
5/8	0.6250	0.642	0.605	1 1/16	1.062	1.031	1.227	1.175	27/64	0.444	0.378	0.06	0.02	1.500	1.750
3/4	0.7500	0.768	0.729	1 1/4	1.250	1.212	1.443	1.383	1/2	0.524	0.455	0.06	0.02	1.750	2.000
7/8	0.8750	0.895	0.852	1 7/16	1.438	1.394	1.660	1.589	37/64	0.604	0.531	0.06	0.02	2.000	2.250
1	1.0000	1.022	0.976	1 5/8	1.625	1.575	1.876	1.796	43/64	0.700	0.591	0.09	0.03	2.250	2.500
1 1/8	1.1250	1.149	1.098	1 13/16	1.812	1.756	2.093	2.002	3/4	0.780	0.658	0.09	0.03	2.500	2.750
1 1/4	1.2500	1.277	1.223	2	2.000	1.938	2.309	2.209	27/32	0.876	0.749	0.09	0.03	2.750	3.000
1 3/8	1.3750	1.404	1.345	2 3/16	2.188	2.119	2.526	2.416	29/32	0.940	0.810	0.09	0.03	3.000	3.250
1 1/2	1.5000	1.531	1.470	2 3/8	2.375	2.300	2.742	2.622	1	1.036	0.902	0.09	0.03	3.250	3.500
1 5/8	1.6250	1.658	1.591	2 9/16	2.562	2.481	2.959	2.829	1 3/32	1.116	0.978	0.09	0.03	3.500	3.750
1 3/4	1.7500	1.785	1.716	2 3/4	2.750	2.662	3.175	3.035	1 5/32	1.196	1.054	0.12	0.04	3.750	4.000
1 7/8	1.8750	1.912	1.839	2 15/16	2.938	2.844	3.392	3.242	1 1/4	1.276	1.130	0.12	0.04	4.000	4.250
2	2.0000	2.039	1.964	3 1/8	3.125	3.025	3.608	3.449	1 11/32	1.388	1.175	0.12	0.04	4.250	4.500
2 1/4	2.2500	2.305	2.214	3 1/2	3.500	3.388	4.041	3.862	1 1/2	1.548	1.327	0.19	0.06	4.750	5.000
2 1/2	2.5000	2.559	2.461	3 7/8	3.875	3.750	4.474	4.275	1 21/32	1.708	1.479	0.19	0.06	5.250	5.500
2 3/4	2.7500	2.827	2.711	4 1/4	4.250	4.112	4.907	4.688	1 13/16	1.869	1.632	0.19	0.06	5.750	6.000
3	3.0000	3.081	2.961	4 5/8	4.625	4.475	5.340	5.102	2	2.060	1.815	0.19	0.06	6.250	6.500

ASME B18.2.1 Heavy Hex Bolts Length Length Tolerance (Inch)

Nominal Length	Nominal Size
Nominal Length	1/4 to 3/8	7/16 and 1/2	9/16 to 3/4	7/8 and 1	1 1/8 to 1 1/2	Over 1 1/2
Up to 1 in., incl.	+0.02 0.03	+0.02 0.03	+0.02 0.03	...	...	...
Over 1 in. to 2 1/2 in., incl.	+0.02 0.04	+0.04 0.06	+0.06 0.08	+0.08 0.10	+0.12 0.12	+0.18 0.18
Over 2 1/2 in. to 4 in., incl.	+0.04 0.06	+0.06 0.08	+0.08 0.10	+0.10 0.14	+0.16 0.16	+0.20 0.20
Over 4 in. to 6 in., incl.	+0.06 0.10	+0.08 0.10	+0.10 0.10	+0.12 0.16	+0.18 0.18	+0.22 0.22
Longer than 6 in.	+0.10 0.18	+0.12 0.18	+0.14 0.18	+0.16 0.20	+0.22 0.22	+0.24 0.24

ASME B18.2.1 Heavy Hex Bolts Grip Gaging Lengths (Inch)

Nominal Size	Nominal Length, Lg, max. / Lb, min.
	1-1/4		1-3/8		1-1/2		1-5/8		1-3/4		1-7/8		2		2-1/8		2-1/4		2-3/8		2-1/2		2-5/8		2-3/4		2-7/8		3		3-1/4		3-1/2		3-3/4		4		4-1/4		4-1/2		4-3/4		5		5-1/4		5-1/2		5-3/4		6		6-1/4		6-1/2		6-3/4		7		7-1/4		7-1/2		7-3/4		8		8-1/4		8-1/2		8-3/4		9		9-1/4		9-1/2		9-3/4		10		11		12
	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.	L_g Max.	L_b Min.
1/4	12.70	6.35	16.00	9.65	19.05	12.70	22.35	15.75	25.40	19.05	28.45	22.35	31.75	25.40	35.05	28.45	38.10	31.75	41.15	35.05	44.45	38.10	47.75	41.15	50.80	44.45	53.85	47.75	64.01	50.80	63.50	57.15	69.85	63.50	76.20	69.85	82.55	76.20	88.90	82.55	95.25	88.90	101.60	95.25	107.95	101.60	114.30	107.95	120.65	114.30	127.00	120.65	133.35	127.00	133.35	127.00	139.70	133.35	146.05	139.70	152.40	146.05	158.75	152.40	165.10	158.75	171.45	165.10	177.80	171.45	184.15	177.80	190.50	184.15	196.85	190.50	203.20	196.85	209.55	203.20	215.90	209.55	222.25	215.90	228.60	222.25	254.00	247.65	279.40	273.05
5/16	Full thread		12.70	5.59	15.75	8.89	19.05	11.94	22.35	15.24	25.40	18.29	28.45	21.59	31.75	24.64	35.05	27.94	38.10	30.99	41.15	34.29	44.45	37.34	47.75	40.64	50.80	43.69	53.85	46.99	60.45	53.34	66.55	59.69	73.15	66.04	79.25	72.39	85.85	78.74	91.95	85.09	98.55	91.44	104.65	97.79	111.25	104.14	117.35	110.49	123.95	116.84	130.05	123.19	130.05	123.19	136.65	129.54	142.75	135.89	149.35	142.24	155.45	148.59	162.05	154.94	168.15	161.29	174.75	167.64	180.85	173.99	187.45	180.34	193.55	186.69	200.15	193.04	206.25	199.39	212.85	205.74	218.95	212.09	225.55	218.44	250.95	243.84	276.35	269.24
3/8	Full thread		Full thread		12.70	4.83	15.75	7.87	19.05	11.18	22.35	14.22	25.40	17.53	28.45	20.57	31.75	23.88	35.05	26.92	38.10	30.23	41.15	33.27	44.45	36.58	47.75	39.62	50.80	42.93	57.15	49.28	63.50	55.63	69.85	61.98	76.20	68.33	82.55	74.68	88.90	81.03	95.25	87.38	101.60	93.73	107.95	100.08	114.30	106.43	120.65	112.78	127.00	119.13	127.00	119.13	133.35	125.48	139.70	131.83	146.05	138.18	152.40	144.53	158.75	150.88	165.10	157.23	171.45	163.58	177.80	169.93	184.15	176.28	190.50	182.63	196.85	188.98	203.20	195.33	209.55	201.68	215.90	208.03	222.25	214.38	247.65	239.78	273.05	265.18
7/16	Full thread		Full thread		Full thread		Full thread		16.00	6.86	19.05	9.91	22.35	13.21	25.40	16.26	28.45	19.56	31.75	22.61	35.05	25.91	38.10	28.96	41.15	32.26	44.45	35.31	47.75	38.61	53.85	44.96	60.45	51.31	66.55	57.66	73.15	64.01	79.25	70.36	85.85	76.71	91.95	83.06	98.55	89.41	104.65	95.76	111.25	102.11	117.60	108.46	123.95	114.81	123.95	114.81	130.05	121.16	136.65	127.51	142.75	133.86	149.35	140.21	155.45	146.56	162.05	152.91	168.15	159.26	174.75	165.61	180.85	171.96	187.45	178.31	193.55	184.66	200.15	191.01	206.25	197.36	212.85	203.71	218.95	210.06	244.35	235.46	269.75	260.86
1/2	Full thread		Full thread		Full thread		Full thread		Full thread		16.00	6.10	19.05	9.65	22.35	12.45	25.40	15.75	28.45	18.80	31.75	21.84	35.05	25.15	38.10	28.45	41.15	31.50	44.45	34.54	50.80	41.15	57.15	47.24	63.50	53.85	69.85	59.94	76.20	66.55	82.55	72.64	88.90	79.25	95.25	85.34	101.60	91.95	107.95	98.30	114.30	104.65	120.65	110.74	120.65	110.74	127.00	117.35	133.35	123.44	139.70	130.05	146.05	136.14	152.40	142.75	158.75	149.10	165.10	155.45	171.45	161.54	177.80	168.15	184.15	174.24	190.50	180.85	196.85	186.94	203.20	193.55	209.55	199.64	215.90	206.25	241.30	231.65	266.70	257.05
9/16	Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		19.05	8.38	22.35	11.43	25.40	14.73	28.45	19.05	31.75	21.08	35.05	24.38	38.10	27.43	41.15	30.73	47.75	37.08	53.85	43.43	60.45	49.78	66.55	56.13	73.15	62.48	79.25	68.83	85.85	75.18	91.95	81.53	98.55	87.88	104.65	94.23	111.25	100.58	117.35	106.93	117.35	106.93	123.95	113.28	130.05	119.63	136.65	125.98	142.75	132.08	149.35	138.68	155.45	145.03	162.05	151.38	168.15	157.73	174.75	164.08	180.85	170.43	187.45	176.78	193.55	183.13	200.15	189.48	206.25	195.83	212.85	202.18	238.25	227.58	263.65	252.98
5/8	Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		19.05	7.62	22.35	10.67	25.40	13.97	28.45	17.02	31.75	20.32	35.05	23.37	38.10	26.67	44.45	33.02	50.80	39.37	57.15	45.72	63.50	52.07	69.85	58.42	76.20	64.77	82.55	71.12	88.90	77.47	95.25	83.82	101.60	90.17	107.95	96.52	114.30	102.87	114.30	102.87	120.65	109.22	127.00	115.57	133.35	121.92	139.70	128.27	146.05	134.62	152.40	140.97	158.75	147.32	165.10	153.67	171.45	160.02	177.80	166.37	184.15	172.72	190.50	179.07	196.85	185.42	203.20	191.77	209.55	198.12	234.95	223.52	260.35	248.92
3/4	Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		28.45	17.02	31.75	20.32	35.05	23.37	38.10	26.67	38.10	25.40	44.45	31.75	50.80	38.10	57.15	44.45	63.50	50.80	69.85	57.15	76.20	63.50	82.55	69.85	88.90	76.20	95.25	82.55	101.60	88.90	107.95	95.25	107.95	95.25	114.30	101.60	120.65	107.95	127.00	114.30	133.35	120.65	139.70	127.00	146.05	133.35	152.40	139.70	158.75	146.05	165.10	152.40	171.45	158.75	177.80	165.10	184.15	171.45	190.50	177.80	196.85	184.15	203.20	190.50	228.60	215.90	254.00	241.30
7/8	Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		25.40	12.70	28.45	15.75	31.75	19.05	31.75	17.53	38.10	23.88	44.45	30.23	50.80	36.58	57.15	42.93	63.50	49.28	69.85	55.63	76.20	61.98	82.55	68.33	88.90	74.68	95.25	81.03	101.60	87.38	101.60	87.38	107.95	93.73	114.30	100.08	120.65	106.43	127.00	112.78	133.35	119.13	139.70	125.48	146.05	131.83	152.40	138.18	158.75	144.53	165.10	150.88	171.45	157.23	177.80	163.58	184.15	170.18	190.50	176.28	196.85	182.63	222.25	208.03	247.65	233.43
1	Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		22.35	8.13	25.40	11.18	25.40	9.65	31.75	15.75	38.10	22.35	44.45	28.45	50.80	35.05	57.15	41.15	63.50	47.75	69.85	53.85	76.20	60.45	82.55	66.55	88.90	73.15	95.25	79.25	95.25	79.25	101.60	85.85	107.95	92.20	114.30	98.55	120.65	104.65	127.00	111.25	133.35	117.60	139.70	123.95	146.05	130.05	152.40	136.65	158.75	142.75	165.10	149.35	171.45	155.45	177.80	162.05	184.15	168.15	190.50	174.75	215.90	200.15	241.30	225.55
1-1/8	Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		31.75	13.72	38.10	20.07	44.45	26.42	50.80	32.77	57.15	39.12	63.50	45.47	69.85	51.82	76.20	58.17	82.55	64.52	88.90	70.87	88.90	70.87	95.25	77.22	101.60	83.57	107.95	89.92	114.30	96.27	120.65	102.62	127.00	108.97	133.35	115.32	139.70	121.67	146.05	128.02	152.40	134.37	158.75	140.72	165.10	147.07	171.45	153.42	177.80	159.77	184.15	166.12	209.55	191.52	234.95	216.92
1-1/4	Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		31.75	13.72	38.10	20.07	44.45	26.42	50.80	32.77	57.15	39.12	63.50	45.47	69.85	51.82	76.20	58.17	82.55	64.52	82.55	64.52	88.90	70.87	95.25	77.22	101.60	83.57	107.95	89.92	114.30	96.27	120.65	102.62	127.00	108.97	133.35	115.32	139.70	121.67	146.05	128.02	152.40	134.37	158.75	140.72	165.10	147.07	171.45	153.42	177.80	159.77	203.20	185.17	228.60	210.57
1-3/8	Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		38.10	20.07	44.45	26.42	50.80	32.77	57.15	39.12	63.50	45.47	69.85	51.82	76.20	58.17	82.55	64.52	82.55	64.52	88.90	70.87	95.25	77.22	101.60	83.57	107.95	89.92	114.30	96.27	120.65	102.62	127.00	108.97	133.35	115.32	139.70	121.67	146.05	128.02	152.40	134.37	158.75	140.72	165.10	147.07	171.45	153.42	196.85	178.82	222.25	204.22
1-1/2	Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		Full thread		38.10	17.02	44.45	23.37	50.80	29.72	57.15	36.07	63.50	42.42	69.85	48.77	69.85	48.77	76.20	55.12	82.55	61.47	88.90	67.82	95.25	74.17	101.60	80.52	107.95	86.87	114.30	93.22	120.65	99.57	127.00	105.92	133.35	112.27	139.70	118.62	146.05	124.97	152.40	131.32	158.75	137.67	165.10	144.02	190.50	169.42	215.90	194.82

ASME Material Specifications

ASTM A193/A193M Standard Specification for Alloy-Steel and Stainless Steel Bolting Materials for High Temperature or High Pressure Service and Other Special Purpose Applications
ASTM A307 Standard Specification for Carbon Steel Bolts and Studs, 60 000 PSI Tensile Strength
ASTM A449 Standard Specification for Hex Cap Screws, Bolts and Studs, Steel, Heat Treated, 120/105/90 ksi Minimum Tensile Strength
ASTM A453/A453M Standard Specification for Bolting, Stud Bolts, Screws, Nuts
ASTM A354 Standard Specification for Quenched and Tempered Alloy Steel Bolts, Studs, and Other Externally Threaded Fasteners
ASTM A320 Standard Specification for Alloy-Steel and Stainless Steel Bolting for Low-Temperature Service
ASTM A1082/A1082M Standard Specification for Bolting, Stud Bolts, Screws, Nuts
ASTM A1014/A1014M Standard Specification for UNS N07718 Bolting, Stud Bolts, Screws, Nuts
ASTM F468 Standard Specification for Nonferrous Bolts, Hex Cap Screws, and Studs
ASTM F593 Standard Specification for Stainless Steel Bolts, Hex Cap Screws, and Studs
ASTM F901 Aluminium Transmission Tower Bolts
ASTM F738 Stud Bolts, Screws
ASTM F1554 Anchor Bolts, Anchor Rods
ASTM F2281 Bolting, Stud Bolts, Screws, Hex Cap Screws, Threaded Rods
ASTM F3125 Heavy Hex Bolts, Screws, Studs