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Note:
Assembly torques are offered as a guide only. Tightening should be checked under actual field conditions due to the many variables possiblex
Grade 2
ft.
lbs.
Cap Screw Diameter Proof Load PSI Tensile Strength PSI Min. Recommended Torque
UNC UNF
1/4″ 55000 74000 6.8 7.8
5/16″ 55000 74000 14.5 15.6
3/8″ 55000 74000 25 28
7/16″ 55000 74000 40 45
1/2″ 55000 74000 61 69
9/16″ 55000 74000 88 98
5/8″ 55000 74000 121 137
3/4″ 55000 74000 216 241
7/8″ 33000 60000 282 311
1″ 33000 60000 422 464
1 1/8″ 33000 60000 604 677
1 1/4″ 33000 60000 847 940
1 1/2″ 33000 60000 1300 1470
Grade 5
ft.
lbs.
Cap Screw Diameter Proof Load PSI Tensile Strength PSI Min. Recommended Torque
UNC UNF
1/4″ 85000 120000 9.7 11
5/16″ 85000 120000 18 20
3/8″ 85000 120000 39 44
7/16″ 85000 120000 59 69
1/2″ 85000 120000 87 103
9/16″ 85000 120000 111 132
5/8″ 85000 120000 173 200
3/4″ 85000 120000 290 345
7/8″ 85000 120000 500 585
1″ 85000 120000 690 830
1 1/8″ 74000 105000 1056 1185
1 1/4″ 74000 105000 1450 1640
1 1/2″ 74000 105000 1820 2050
Grade 8
ft.
lbs.
Cap Screw Diameter Proof Load PSI Tensile Strength PSI Min. Recommended Torque
UNC UNF
1/4″ 120000 150000 14 16
5/16″ 120000 150000 28.5 31
3/8″ 120000 150000 50 58
7/16″ 120000 150000 81 90
1/2″ 120000 150000 125 140
9/16″ 120000 150000 180 200
5/8″ 120000 150000 247 280
3/4″ 120000 150000 440 490
7/8″ 120000 150000 700 780
1″ 120000 150000 1060 1160
1 1/8″ 120000 150000 1500 1690
1 1/4″ 120000 150000 2120 2340
1 1/2″ 120000 150000 2900 3300
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