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SAE Bolt Torque Values (Nm)

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Bolt Assembly Torque (Nm)
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)   9 15
5/16-18 (NC)   20 30 16
3/8-16 (NC)   40 55 25
7/16-14 (NC)   60 90 45
1/2-13 (NC)   95 130 75
9/16-12 (NC)   135 190 110
5/8-11 (NC)   180 255 150
3/4-10 (NC)   325 460 255
7/8-9 (NC)   490 745 380
1-8 (NC)   720 1100 570
Fine Thread
Size Grade 2 Iron Grade 5 Iron Grade 8 Iron Aluminum
1/4-28 (NF)   12 18 9
5/16-24 (NF)   23 33 19
3/8-24 (NF)   40 60 35
7/16-20 (NF)   65 95 55
1/2-20 (NF)   100 150 80
9/16-18 (NF)   150 210 115
5/8-18 (NF)   210 290 160
3/4-16 (NF)   365 515 285
7/8-14 (NF)   530 845 420
1-14 (NF)   800 120 650
   
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