GENERAL SERVICE INFORMATION
Tightening Torques for Standard Bolts and Nuts
12/05
BY Service Manual
3-23
© 2009 Yanmar Marine International
TIGHTENING TORQUES FOR STANDARD BOLTS AND NUTS
Tightening Fasteners
Use the correct amount of torque when tightening fasteners. Applying excessive torque may damage the
fastener or component and not enough torque may cause a leak or component failure.
Hexagon Bolts and Nuts
Hose Clamps
NOTICE: NEVER reuse or retighten hose clamps.
ALWAYS install new hose clamps.
Nominal
Diameter
Grade (Lubricated)
8.8 or 8
10.9 or 10
12.9 or 12
M4
2.7 N·m (24 in.-lb)
3.88 N·m (34.3 in.-lb)
4.6 N·m (41 in.-lb)
M5
5.5 N·m (48.6 in.-lb)
8 N·m (71 in.-lb)
9.5 N·m (84 in.-lb)
M6
9.5 N·m (84 in.-lb)
13 N·m (115 in.-lb)
16 N·m (142 in.-lb)
M7
15 N·m (133 in.-lb)
22 N·m (195 in.-lb)
26 N·m (230 in.-lb)
M8
23 N·m (204 in.-lb)
32 N·m (24 ft-lb)
39 N·m (29 ft-lb)
M8 x 1
25 N·m (221 in.-lb)
35 N·m (26 ft-lb)
42 N·m (31 ft-lb)
M10
46 N·m (34 ft-lb)
64 N·m (47 ft-lb)
77 N·m (57 ft-lb)
M10 x 1.25
49 N·m (36 ft-lb)
68 N·m (50 ft-lb)
82 N·m (60 ft-lb)
M12
80 N·m (59 ft-lb)
110 N·m (81 ft-lb)
135 N·m (100 ft-lb)
M12 x 1.5
88 N·m (65 ft-lb)
125 N·m (92 ft-lb)
150 N·m (111 ft-lb)
Size
Specification
5 mm Hex Head
1.0 to 1.5 N·m (8.9 to 13 in.-lb)
6 mm Hex Head
2.5 to 3.5 N·m (22 to 31 in.-lb)
