Mid-States Brochures

Bolt Torque

Bolt Size (in.)	Coarse Threads / inch	Standard Dry Torque in Foot-Pounds
Bolt Size (in.)	Coarse Threads / inch	SAE Grade 0-1-2 74,000 psi Low Carbon Steel	SAE Grade 3 100,000 psi Med. Carbon Steel	SAE Grade 5 120,000 psi Med. Carbon Heat T. Steel	SAE Grade 6 133,000 psi Med. Carbon Temp. Steel	SAE Grade 7 133,000 psi Med. Carbon Alloy Steel ;	SAE Grade 8 150,000 psi Med. Carbon Alloy Steel
1/4	20	6	9	10	12.5	13	14
5/16	18	12	17	19	24	25	29
3/8	16	20	30	33	43	44	47
7/16	14	32	47	54	69	71	78
½	13	47	69	78	106	110	119
9/16	12	69	103	114	150	154	169
5/8	11	96	145	154	209	215	230
¾	10	155	234	257	350	360	380
7/8	9	206	372	382	550	570	600
1	8	310	551	587	825	840	700
1-1/8	7	480	872	794	1304	1325	1430
1-1/4	7	375	1211	1105	1815	1825	1975
1-3/8	6	900	1624	1500	2434	2500	2650
1-1/2	6	1100	1943	1775	2913	3000	3200
1-5/8	5.5	1470	2660	2425	3985	4000	4400
1-3/4	5	1900	3463	3150	5189	5300	5650
1-7/8	5	2360	4695	4200	6980	7000	7600
2	4.5	2750	5427	4550	7491	7500	8200

Align component parts and clamp together with hold down.
Lubricate stud (or bolt) threads in area of nut (or forged ring) engagement; also lubricate face of nuts (or bolt head) using a suitable lubricant.
Install all bolts and nuts finger tight.
Number bolts so that torque requirements can be followed.
Apply torque in 20% (1/5) steps of required final torque, loading all bolts at each step before proceeding to next step.
Tighten bolts in sequential order: 0-180°, 90°- 270°, 45°- 225° & 135°-315° at each step until final torque is reached.
Use rotational tightening until all bolts are stable at final torque level. (Two complete times around is usually required.)

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