GENERAL SERVICE INFORMATION
4-46
TNV DI 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
the fasteners on the machine. Applying excessive
torque may damage the fastener or component and
not enough torque may cause a leak or component
failure.
CAUTION
The tightening torque in the Standard
Torque Chart (see General Service
Information section) 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.
0000023enTNVDISM
Item
Nominal Thread
Diameter
x Pitch
Tightening Torque
Remarks
Hexagon Bolt (7T) and
Nut
M6 x 1.0 mm
7 - 9 ft-lb
(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
17 - 21 ft-lb
(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 mm
7 ft-lb
(87 in.-lb, 9.8 N·m, 1.0 kgf·m)
-
1/4 mm
14 ft-lb
(173 in.-lb, 19.6 N·m, 2.0 kgf·m)
3/8 mm
22 ft-lb
(29.4 N·m, 3.0 kgf·m)
1/2 mm
43 ft-lb
(58.8 N·m, 6.0 kgf·m)
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