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Bolt Torque Guide for Various Bolts and Capscrews

The following table lists the correct torque values for various SAE bolts. It is the customer's responsibility to maintain tightness of all bolts on equipment. If using lock washers or locking nuts, increase torque by 5%.
Bolt Diameter "A" SAE 2 SAE 5 SAE 8
N*m (lb-ft) N*m (lb-ft) N*m (lb-ft) S.A.E. Bolt Markings
1/4" 8 6 12 9 17 12
5/16" 13 10 25 19 36 27
3/8" 27 20 45 33 63 45
7/16" 41 30 72 53 100 75
1/2" 61 45 110 80 155 115
9/16" 95 70 155 115 220 165
5/8" 128 95 215 160 305 220
3/4" 225 165 390 290 540 400
7/8" 230 170 570 420 880 650
1" 345 225 850 630 1320 970
Always replace hardware with the same grade as the original. 
NOTE:
On shear bolt-protected gear boxes, make sure to always use a grade 2 bolt. Otherwise you run the risk of damaging your gear box.
 
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