Bolt Torque

Max Torque (foot-pounds) for clean, dry threads

Bolt size – Thread pitch Grade 2 Grade5 Grade 8 Special Alloy
1/4-20 6 10 12 14
1/4-28 7 12 15 17
5/16-18 13 20 24 29
5/16-24 14 22 27 35
3/8-16 23 36 44 58
3/8-24 26 40 48 69
7/16-14 37 52 63 98
7/16-20 41 57 70 110
1/2-13 57 80 98 145
1/2-20 64 90 110 160
9/16-12 82 120 145 200
9/16-18 91 135 165 220
5/8-11 111 165 210 280
5/8-18 128 200 245 310
3/4-10 200 285 335 490
3/4-16 223 315 370 530
7/8-9 315 430 500 760
7/8-14 340 470 550 800
1-8 400 650 760 1130
1-14 460 710 835 1210

Torque specs for GRD 214
1/3/02 7:00:42 AM PST From: alfg@sk.sympatico.ca (Ralph Goff)
I have a Chilton’s Scout manual and they give a general guide for torque values for the various different sizes and grades of bolts and studs. Now I am assuming the KB has 3/8 studs in the manifold like my S has. The Scout guide recommends 18 to 20 foot pounds for grade 1 or 2 studs. For the higher grade 5 studs they recommend 31 to 35 pounds. If by chance you have grade 6 or 7 studs then the torque settings are 34 ft. lbs. These settings are for clean dry threads. If oil is used on the threads they advise to reduce the settings by 10%. Ralph in SK.

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About jimhadfield

Retired and enjoying it.
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