3-29
TORQUE DATA
BOLT SAE GRADE SAE GRADE SAE GRADE
GRADE 1 OR 2 5 8
MARKING
MEDIUM CARBON MEDIUM CARBON
MATERIAL
LOW CARBON
STEEL ALLOY STEEL
Q & T Q & T
MINIMUM
TENSILE 64,000 PSI 120,000 PSI 150,000 PSI
STRENGTH (441 MPa) (827 MPa) (1034 MPa)
BOLT SIZE RECOMMENDED TORQUE VALUES FT-LBS (N-m)
1/4 5 (7) 7 (10) 10.5 (14)
5/16 9 (12) 14 (19) 22 (30)
3/8 15 (20) 25 (34) 37 (50)
7/16 24 (32) 40 (54) 60 (81)
1/2 37 (50) 60 (81) 92 (125)
9/16 53 (72) 88 (119) 132 (179)
5/8 74 (100) 120 (163) 180 (244)
3/4 120 (163) 200 (271) 296 (401)
7/8 190 (258) 302 (409) 473 (641)
1 282 (382) 466 (632) 714 (968)
THE FOLLOWING RULES APPLY TO THE CHART:
1. Consult manufacturers' specific recommendations when available.
2. The chart may be used with coarse and fine thread fasteners lightly lubricated.
3. Increase torque by 20% when multiple tooth (shakeproof) lockwashers are used.
4. The torque values are given in foot-pounds (N·m).
5. Inch-pounds equivalent may be obtained by multiplying by 12
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