30
Nominal
Thread Size
Grade 2 Grade 5 Grade 8
Clamping
Load
Tightening
Torque
Clamping
Load
Tightening
Torque
Clamping
Load
Tightening
Torque
Coarse Thread
1/4-20 1,300 lbs 65 in-lbs 2,000 lbs 100 in-lbs 2,850 lbs 143 in-lbs
5/16-18 2,150 lbs 134 in-lbs 3,350 lbs 210 in-lbs 4,700 lbs 305 in-lbs
3/8-16 3,200 lbs 20 ft-lbs 4,950 lbs 31 ft-lbs 6,950 lbs 44 ft-lbs
7/16-14 4,400 lbs 30 ft-lbs 6,800 lbs 50 ft-lbs 9,600 lbs 70 ft-lbs
1/2-13 5,850 lbs 49 ft-lbs 9,050 lbs 75 ft-lbs 12,800 lbs 107 ft-lbs
9/16-12 7,500 lbs 70 ft-lbs 11,600 lbs 109 ft-lbs 16,400 lbs 154 ft-lbs
5/8-11 9,300 lbs 97 ft-lbs 14,500 lbs 151 ft-lbs 20,300 lbs 211 ft-lbs
3/4-10 13,800 lbs 173 ft-lbs 21,300 lbs 266 ft-lbs 30,100 lbs 376 ft-lbs
7/8-9 11,425 lbs 166 ft-lbs 29,435 lbs 430 ft-lbs 41,550 lbs 606 ft-lbs
1-8 15,000 lbs 250 ft-lbs 38,600 lbs 640 ft-lbs 54,540 lbs 900 ft-lbs
Fine Thread
1/4-28 1,500 lbs 75 in-lbs 2,300 lbs 115 in-lbs 3,250 lbs 163 in-lbs
5/16-24 2,400 lbs 150 in-lbs 3,700 lbs 230 in-lbs 5,200 lbs 325 in-lbs
3/8-24 3,600 lbs 23 ft-lbs 5,600 lbs 35 ft-lbs 7,900 lbs 50 ft-lbs
7/16-20 4,900 lbs 36 ft-lbs 7,550 lbs 55 ft-lbs 10,700 lbs 78 ft-lbs
1/2-20 6,600 lbs 55 ft-lbs 10,200 lbs 85 ft-lbs 14,400 lbs 120 ft-lbs
9/16-18 8,400 lbs 79 ft-lbs 13,000 lbs 112 ft-lbs 18,300 lbs 172 ft-lbs
5/8-18 10,600 lbs 110 ft-lbs 16,300 lbs 170 ft-lbs 23,000 lbs 240 ft-lbs
3/4-16 15,400 lbs 193 ft-lbs 23,800 lbs 298 ft-lbs 33,600 lbs 420 ft-lbs
7/8-14 12,610 lbs 184 ft-lbs 32,480 lbs 473 ft-lbs 45,855 lbs 668 ft-lbs
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