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Bolt Tensile Strengths

Contributed By: Joe Schaefer

Bolt Grade/Tensile Strength

Note: NOT shear strength!

 

GradeDia(in)Coarse(lbs)Fine(lbs)
2 1/4 2350 2700
5/16 3900 4300
7/16 7850 8800
1/2 10500 11800
9/16 13500 15000
5/8 16700 18900
3/4 24700 27600
5 1/4 3800 4350
5/16 6300 6950
7/16 12800 14400
1/2 17000 19200
9/16 21800 24400
5/8 27100 30700
3/4 40100 44800
8 1/4 4750 5450
5/16 7850 8700
7/16 15900 17800
1/2 21300 24000
9/16 27300 30400
5/8 33900 38400
3/4 50100 56000

 

Nominal Assembly Torque (ft-lbs)

Dia.(in.) Grade 2 Grade 5 Grade 8 Grade 9
1/4C 5.5 8 12 11
1/4F 6.3 10 14 13
5/16C 11 17 24 21
5/16F 12 19 27 23
7/16C 32 50 70 60
7/16F 36 55 80 65
1/2C 50 75 110 95
1/2F 55 85 120 105
9/16C 70 110 150 140
9/16F 80 120 170 150
5/8C 100 150 210 185
5/8F 110 170 240 205
3/4C 175 260 380 290
3/4F 200 300 420 355

C=coarse thread F=fine thread

corner corner