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Torque Settings
Use these torque settings only where no torque setting has been specified in the text. Values
are for dry threads and may be within 3% of the figures stated. For lubricated threads the
values should be reduced by one third.
UNF Grade “S” Bolts
Bolt Size Hexagon (A/F) Torque Settings
in (mm) in Nm lbf ft
1/4 6.3 7/16 14 10
5/16 7.9 1/2 28 20
3/8 9.5 9/16 49 36
7/16 11.1 5/8 78 58
1/2 12.7 3/4 117 87
9/16 14.3 13/16 170 125
5/8 15.9 15/16 238 175
3/4 19 1 1/8 407 300
7/8 22.2 1 5/16 650 480
1 25.4 1 1/2 970 715
1 1/4 31.7 1 7/8 1940 1430
1 1/2 38.1 2 1/4 3390 2500
METRIC Grade “8.8” Bolts
M5 5 8 7 5
M6 6 10 12 9
M8 8 13 28 21
M10 10 17 56 42
M12 12 19 98 72
M16 16 24 244 180
M20 20 30 476 352
M24 24 36 822 607
M30 30 46 1633 1205
M36 36 55 2854 2105
M8 8 13 48 35
M10 10 17 94 69
M12 12 19 166 122
M16 16 24 400 295
METRIC Grade “12.9” Bolts
M14 14 22 320 236
Hexagon (A/F)
mm
Note: All bolts are of high tensile strength and must not be replaced by bolts of a lesser
tensile specification.
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