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SAE Bolt Torque Values

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Standard SAE Bolt Dimensions and Grades
 
Bolt Assembly Torque (ft-lb)       [Nm Chart]
The torque values in the table are based on the use of lubricated threads.
Coarse Thread
Size Grade 2 Iron Grade 5 Iron Grade 8 Iron Aluminum
1/4-20 (NC) 7 11
5/16-18 (NC) 18  15 22 12
3/8-16 (NC)   30 40 20
7/16-14 (NC) 32 45 65 35
1/2-13 (NC) 50 70 95 55
9/16-12 (NC) 70 100 140 80
5/8-11 (NC) 100 135 190 110
3/4-10 (NC) 175 240 340 190
7/8-9 (NC)   360 550 280
1-8 (NC)   530 820 420
Fine Thread
Size Grade 2 Iron Grade 5 Iron Grade 8 Iron Aluminum
1/4-28 (NF) 9 13 7
5/16-24 (NF) 12  17 24 14
3/8-24 (NF)   30 45 25
7/16-20 (NF) 36 50 70 40
1/2-20 (NF) 55 75 110 60
9/16-18 (NF) 80 110 155 85
5/8-18 (NF) 110 155 215 120
3/4-16 (NF) 200 270 380 210
7/8-14 (NF)   390 610 310
1-14 (NF)   590 890 480
   
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