GENERAL INTRODUCTION
1–26
TIGHTENING OF ENGINE BOLTS AND NUTS
1.
TIGHTENING TORQUE FOR GENERAL STANDARD BOLTS
(1)
Representative tightening torque for shouldered bolts
Unit: N
m {kgf
cm, lbf
ft}
(2)
Representative torque for washer bolt
Unit: N
m {kgf
cm, lbf
ft}
Thread diameter X pitch
7T
9T
M8 X 1.25 (coarse thread)
28.5 {290, 21}
36 {370, 27}
M10 X 1.25 (fine thread)
60 {610, 44}
74.5 {760, 55}
M10 X 1.5 (coarse thread)
55 {560, 40}
68.5 {700, 51}
M12 X 1.25 (fine thread)
108 {1,100, 80}
136 {1,390, 101}
M12 X 1.75 (coarse thread)
97 {990, 72}
125 {1,280, 93}
M14 X 1.5 (fine thread)
171.5 {1,750, 127}
216 {2,210, 160}
M14 X 2 (coarse thread)
154 {1,570, 114}
199 {2,030, 147}
Remark
Bolt with a numerical character "7"
indicated on the head
Bolt with a numerical character "9"
indicated on the head
Thread diameter X pitch
4T
7T
9T
M6 X 1 (coarse thread)
6 {60, 4.3}
10 {100, 7.2}
13 {130, 9.4}
M8 X 1.25 (coarse thread)
14 {140, 10}
25 {250, 18}
31 {320, 23}
M10 X 1.25 (fine thread)
29 {300, 22}
51 {520, 38}
64 {650, 47}
M10 X 1.5 (coarse thread)
26 {270, 20}
47 {480, 35}
59 {600, 43}
M12 X 1.25 (fine thread)
54 {550, 40}
93 {950, 69}
118 {1,200, 87}
M12 X 1.75 (coarse thread)
49 {500, 36}
83 {850, 61}
108 {1,100, 80}
M14 X 1.5 (fine thread)
83 {850, 61}
147 {1,500, 108}
186 {1,900, 137}
M14 X 2 (coarse thread)
74 {750, 54}
132 {1,350, 98}
172 {1,750, 127}
Remark
Bolt with a numerical
character "4" indicated on
the head Projection bolt.
Stud with a rounded free
end.
Bolt with a numerical
character "7" indicated on
the head. Stud with a
chamfered free end.
Bolt with a numerical
character "9" indicated on
the head
