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STANDARD TIGHTENING TORQUES FOR BOLTS AND NUTS
Face seal
Width
Nominal -
across
No. of
Target value
flats (b)
threads (a)
Nm kgm
(mm)
9/16 -18UNF
19
44
11/16 -16UN
22
74
13/16 -16UN
27
103 10.5
1 -14UNS
32
157 16.0 115.7 128 - 186 13.0 - 19.0 94.0 - 137.4
13/16 -12UN
36
216 22.0 159.1 177 - 245 18.0 - 25.0 130.2 - 180.8
4 - 14
Tightening torque
Permissible range
lbft
Nm
kgm
4.5
32.5
35 - 63
3.5 - 6.5
7.5
54.2
54 - 93
5.5 - 9.5
75.9 84 - 132 8.5 - 13.5
lbft
25.3 - 47.0
39.8 - 68.7
61.5 - 97.6
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