ASME B18.31.2 Clamping Type Full Body Studs

ASME B18.31.2 Clamping Type Full Body Studs Standard covers the dimensional and general data for double-end studs recognized as American National Standard in inch dimensions.
Double-end (clamping type — identical ends) stud: a stud with screw threads of the same length and configuration on each end. This type of stud serves the function of clamping two bodies together with a nut on each end.
Full body studs have a shank diameter approximately equal to the nominal thread diameter along the entire unthreaded portion of the stud.
The inclusion of dimensional data in ASME B18.31.2 Standard is not intended to imply that all products described are stock production items. Consumers should consult with suppliers concerning availability of products.

ASME B18.31.2 Dimensions for Clamping Type Full Body Studs (mm)

Nominal Size	Diameter, D	Nut End Minimum Full Thread Length, Bmin			Minimum Body Diameter, DS
		L ≤ 254 mm (10 in)	254 < L ≤ 406.4 mm (10 < L ≤ 16 in)	L > 406.4 mm (16 in)	UNC and NC-5 HF Threads	UNF Threads	8UN Threads
¼	6.350	19.050	25.400	38.100	6.121	6.172	…
5/16	7.938	22.225	28.575	41.275	7.696	7.722	…
3/8	9.525	25.400	31.750	44.450	9.246	9.322	…
7/16	11.113	28.575	34.925	47.625	10.820	10.871	…
½	12.700	31.750	38.100	50.800	12.395	12.471	…
9/16	14.288	34.925	41.275	53.975	13.970	14.021	…
5/8	15.875	38.100	44.450	57.150	15.519	15.621	…
¾	19.050	44.450	50.800	63.500	18.669	18.771	…
7/8	22.225	50.800	57.150	69.850	21.819	21.920	…
1	25.400	57.150	63.500	76.200	24.968	25.070	…
1⅛	28.575	63.500	69.850	82.550	28.092	28.245	28.143
1¼	31.750	69.850	76.200	88.900	31.267	31.420	31.318
1⅜	34.925	76.200	82.550	95.250	34.392	34.595	34.493
1½	38.100	82.550	88.900	101.600	37.567	37.770	37.668
1⅝	41.275	88.900	95.250	107.950	…	…	40.843
1¾	44.450	95.250	101.600	114.300	43.866	…	44.018
1⅞	47.625	101.600	107.950	120.650	…	…	47.193
2	50.800	107.950	114.300	127.000	50.165	…	50.368
2¼	57.150	120.650	127.000	139.700	56.515	…	56.718
2½	63.500	133.350	139.700	152.400	62.814	…	63.068
2¾	69.850	146.050	152.400	165.100	69.164	…	69.418
3	76.200	...	165.100	177.800	75.514	…	75.743
3¼	82.550	...	177.800	190.500	81.864	…	82.093
3½	88.900	...	190.500	203.200	88.214	…	88.443
3¾	95.250	...	203.200	215.900	94.564	…	94.793
4	101.600	...	215.900	228.600	100.914	…	101.143

ASME B18.31.2 Clamping Type Full Body Stud Length Tolerances (mm)

Range, LT	Tolerance
From 19.05 through 63.5	±1.016
Over 63.5 through 101.6	±2.032
Over 101.6 through 203.2	±2.540
Over 203.2 through 406.4	±3.048
Over 406.4	±4.572

ASME B18.31.2 Dimensions for Clamping Type Full Body Studs (Inch)

Nominal Size	Diameter, D	Nut End Minimum Full Thread Length, Bmin			Minimum Body Diameter, DS
		L ≤ 10	10 < L ≤ 16	L > 16	UNC and NC-5 HF Threads	UNF Threads	8UN Threads
¼	0.2500	0.750	1.000	1.500	0.241	0.243	…
5/16	0.3125	0.875	1.125	1.625	0.303	0.304	…
3/8	0.3750	1.000	1.250	1.750	0.364	0.367	…
7/16	0.4375	1.125	1.375	1.875	0.426	0.428	…
½	0.5000	1.250	1.500	2.000	0.488	0.491	…
9/16	0.5625	1.375	1.625	2.125	0.550	0.552	…
5/8	0.6250	1.500	1.750	2.250	0.611	0.615	…
¾	0.7500	1.750	2.000	2.500	0.735	0.739	…
7/8	0.8750	2.000	2.250	2.750	0.859	0.863	…
1	1.0000	2.250	2.500	3.000	0.983	0.987	…
1⅛	1.1250	2.500	2.750	3.250	1.106	1.112	1.108
1¼	1.2500	2.750	3.000	3.500	1.231	1.237	1.233
1⅜	1.3750	3.000	3.250	3.750	1.354	1.362	1.358
1½	1.5000	3.250	3.500	4.000	1.479	1.487	1.483
1⅝	1.6250	3.500	3.750	4.250	…	…	1.608
1¾	1.7500	3.750	4.000	4.500	1.727	…	1.733
1⅞	1.8750	4.000	4.250	4.750	…	…	1.858
2	2.0000	4.250	4.500	5.000	1.975	…	1.983
2¼	2.2500	4.750	5.000	5.500	2.225	…	2.233
2½	2.5000	5.250	5.500	6.000	2.473	…	2.483
2¾	2.7500	5.750	6.000	6.500	2.723	…	2.733
3	3.0000	...	6.500	7.000	2.973	…	2.982
3¼	3.2500	...	7.000	7.500	3.223	…	3.232
3½	3.5000	...	7.500	8.000	3.473	…	3.482
3¾	3.7500	...	8.000	8.500	3.723	…	3.732
4	4.0000	...	8.500	9.000	3.973	…	3.982

ASME B18.31.2 Clamping Type Full Body Stud Length Tolerances (Inch)

Range, LT	Tolerance
From ¾ through 2½	±0.04
Over 2½ through 4	±0.08
Over 4 through 8	±0.10
Over 8 through 16	±0.12
Over 16	±0.18