Westerbeke Universal M-50 - Bolt Torques

Bolt Torques
Material Grade
Standard
Bolt Special Bolt Special Bolt
Nominal
Dia.
SS41,S20C S43C, S48C (Refined)
SCR3, SCM3 (Refined)
M6 5.8 - 6.9 Ibs/ft.
7.2 - 8.3 Ibs/ft. 9.0 - 10.5 Ibs/ft.
M8 13.0 - 15.2 Ibslft. 17.4 - 20.3 Ibs/ft.
21.7 - 25.3 Ibs/ft.
M 10 28.9 - 33.3 Ibs/ft. 35.4 - 41.2 Ibs/ft.
44.8 - 52.1 Ibs/ft.
M 12 46.3 - 53.5 Ibs/ft. 57.1 - 66.5 Ibs/ft.
75.9 - 86.8 Ibslft.
M 14 79.6 - 92.6 Ibs/ft. 91.1 - 108.5 Ibslft.
123.0 - 144.7 Ibs/ft.
M 16 123.0 - 141.0 Ibslft. 144.7 - 166.4 Ibs/ft.
191.7 - 224.2 Ibs/ft.
M 18
180.0 - 209.8 Ibs/ft. 202.5 - 235.1 Ibs/ft. 253.2 - 296.5 Ibslft.
M 20
245.9 - 289.3 Ibs/ft. 271.2 - 318.2 Ibs/ft. 361.6 - 419.5 Ibs/ft.
Bolt material grades are shown by numbers punched on the bolt heads. Prior to tightening, be sure
to check out the numbers as shown
below:
Punched
Bolt Material Grade
Number
None
Standard
Bolts
SS41, S20C
7
Special Bolts
S43C, S48C
(Refined)
9
Special Bolts
SCM3, SCR3,
(Refined)
18