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Bolt Torque Info

The following chart provides torque and hardness specifications for various grades of fastners. The values are in ft-lbs.

Size Grade 5 Grade 8
dry dry
1/4-20 8 12
1/4-28 10 14
5/16-18 17 25
5/16-24 19 25
3/8-16 30 45
3/8-24 35 50
7/16-14 50 70
7/16-20 55 80
1/2-13 75 110
1/2-20 90 120
9/16-12 110 150
9/16-18 120 170
5/8-11 150 220
5/8-18 180 240
3/4-10 260 380
3/4-16 300 420

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Bolt Torque Info