Load on Alloy Steel Stud Bolts under Torque

Gaskets,Packings, & Seals Inc.
P.O. Box 509
Parkersburg, WV 26102
Tel: 304-422-3880 Fax: 304-422-9476

Load on Alloy Steel Stud Bolts under Torque

Nomial Number Dia. Area STRESS

Dia. of of Root at Root 30,000 psi 45,000 psi 60,000 psi

of Bolt Threads of Thread of Thread Torque Clamping Torque Clamping Torque Clamping

(inches) Per Inch (inches) (sq. in.) (ft. lbs.) Force (lbs./bolt) (ft. lbs.) Force (lbs./bolt) (ft. lbs.) Force (lbs./bolt)

1/4 20 0.185 0.027 4 810 6 1,215 8 1,620

5/16 18 0.240 0.045 8 1,350 12 2,025 16 2,700

3/8 16 0.294 0.068 12 2,040 18 3,060 24 4,080

7/16 14 0.345 0.093 20 2,790 30 4,180 40 5,580

1/2 13 0.400 0.126 30 3,780 45 5,670 60 7,560

9/16 12 0.454 0.162 45 4,860 68 7,290 90 9,720

5/8 11 0.507 0.202 60 6,060 90 9,090 120 12,120

3/4 10 0.620 0.302 100 9,060 150 12,590 200 18,120

7/8 9 0.731 0.419 160 12,570 240 18,855 320 25,140

1 8 0.838 0.551 245 16,530 368 24,795 490 33,060

1 1/8 8 0.963 0.728 355 21,840 533 32,760 710 43,680

1 1/4 8 1.088 0.929 500 27,870 750 41,805 1,000 55,740

1 3/8 8 1.213 1.155 680 34,650 1,020 51,975 1,360 69,300

1 1/2 8 1.338 1.405 800 42,150 1,200 63,225 1,600 84,300

1 5/8 8 1.463 1.680 1,100 50,400 1,650 75,600 2,200 100,800

1 3/4 8 1.588 1.980 1,500 59,400 2,250 89,100 3,000 118,800

1 7/8 8 1.713 2.304 2,000 69,120 3,000 103,680 4,000 138,240

2 8 1.838 2.652 2,200 79,560 3,300 119,340 4,400 159,120

2 1/4 8 2.088 3.423 3,180 102,690 4,770 154,035 6,360 205,380

2 1/2 8 2.338 4.292 4,400 128,760 6,600 193,140 8,800 257,520

2 3/4 8 2.580 5.259 5,920 157,770 8,880 236,655 11,840 315,540

3 8 2.838 6.324 7,720 189,720 11,580 284,580 15,440 379,440

Questions? Comments? Contact us via E-mail or phone at 304-422-3880.


Load on Alloy Steel Stud Bolts under Torque
Nomial	Number	Dia.	Area	STRESS
Dia.	of	of Root	at Root	30,000 psi		45,000 psi		60,000 psi
of Bolt	Threads	of Thread	of Thread	Torque	Clamping	Torque	Clamping	Torque	Clamping
(inches)	Per Inch	(inches)	(sq. in.)	(ft. lbs.)	Force (lbs./bolt)	(ft. lbs.)	Force (lbs./bolt)	(ft. lbs.)	Force (lbs./bolt)
1/4	20	0.185	0.027	4	810	6	1,215	8	1,620
5/16	18	0.240	0.045	8	1,350	12	2,025	16	2,700
3/8	16	0.294	0.068	12	2,040	18	3,060	24	4,080
7/16	14	0.345	0.093	20	2,790	30	4,180	40	5,580
1/2	13	0.400	0.126	30	3,780	45	5,670	60	7,560
9/16	12	0.454	0.162	45	4,860	68	7,290	90	9,720
5/8	11	0.507	0.202	60	6,060	90	9,090	120	12,120
3/4	10	0.620	0.302	100	9,060	150	12,590	200	18,120
7/8	9	0.731	0.419	160	12,570	240	18,855	320	25,140
1	8	0.838	0.551	245	16,530	368	24,795	490	33,060
1 1/8	8	0.963	0.728	355	21,840	533	32,760	710	43,680
1 1/4	8	1.088	0.929	500	27,870	750	41,805	1,000	55,740
1 3/8	8	1.213	1.155	680	34,650	1,020	51,975	1,360	69,300
1 1/2	8	1.338	1.405	800	42,150	1,200	63,225	1,600	84,300
1 5/8	8	1.463	1.680	1,100	50,400	1,650	75,600	2,200	100,800
1 3/4	8	1.588	1.980	1,500	59,400	2,250	89,100	3,000	118,800
1 7/8	8	1.713	2.304	2,000	69,120	3,000	103,680	4,000	138,240
2	8	1.838	2.652	2,200	79,560	3,300	119,340	4,400	159,120
2 1/4	8	2.088	3.423	3,180	102,690	4,770	154,035	6,360	205,380
2 1/2	8	2.338	4.292	4,400	128,760	6,600	193,140	8,800	257,520
2 3/4	8	2.580	5.259	5,920	157,770	8,880	236,655	11,840	315,540
3	8	2.838	6.324	7,720	189,720	11,580	284,580	15,440	379,440