GENERAL SERVICE INFORMATION
4-26
TNV IDI Service Manual
Tightening Torques for Standard Bolts and Nuts
TIGHTENING TORQUES FOR STANDARD BOLTS AND NUTS
Use the correct amount of torque when you tighten
fasteners on the machine. Applying excessive
torque may damage the fastener or component and
not enough torque may cause a leak or component
failure.
NOTICE
The tightening torque in the
Standard Torque
Chart
in
General Service Information
should be
applied only to the bolts with a “7” head. (JIS
strength classification: 7T)
• Apply 60% torque to bolts that are not
listed.
• Apply 80% torque when tightened to
aluminum alloy.
Item
Nominal Thread
Diameter
x Pitch
Tightening Torque
Remarks
Hexagon Bolt (7T)
and Nut
M6 x 1.0 mm
87 - 104 in·lb
(9.8 - 11.8 N·m;
1.0 - 1.2 kgf·m)
Use 80% of the value at left
when the tightening part is
aluminum.
Use 60% of the value at left
for 4T bolts and lock nuts.
M8 x 1.25 mm
200 - 251 in·lb
(22.6 - 28.4 N·m;
2.3 - 2.9 kgf·m)
M10 x 1.5 mm
33 - 40 ft·lb
(44.1 - 53.9 N·m;
4.5 - 5.5 kgf·m)
M12 x 1.75 mm
58 - 72 ft·lb
(78.4 - 98.0 N·m;
8.0 - 10 kgf·m)
M14 x 1.5 mm
94 - 108 ft·lb
(127.5 - 147.1 N·m;
13 - 15 kgf·m)
M16 x 1.5 mm
159 - 174 ft·lb
(215.7 - 235.4 N·m;
22 - 24 kgf·m)
PT Plug
1/8
87 in·lb
(9.8 N·m; 1.0 kgf·m)
-
1/4
173 in·lb
(19.6 N·m; 2.0 kgf·m)
3/8
22 ft·lb
(29.4 N·m; 3.0 kgf·m)
1/2
43 ft·lb
(58.8 N·m; 6.0 kgf·m)
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