GENERAL SERVICE INFORMATION
3TNV88F Service Manual
4-25
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.
NOTICE
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.
Item
Nominal thread
diameter
× pitch
Tightening torque
Remarks
Hexagon bolt (7T)
and nut
M6 × 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 × 1.25 mm
17 - 21 ft-lb
(200 - 251 in.-lb,
22.6 - 28.4 N·m,
2.3 - 2.9 kgf·m)
M10 × 1.5 mm
33 - 40 ft-lb
(44.1 - 53.9 N·m,
4.5 - 5.5 kgf·m)
M12 × 1.75 mm
58 - 72 ft-lb
(78.4 - 98.0 N·m,
8.0 - 10 kgf·m)
M14 × 1.5 mm
94 - 108 ft-lb
(127.5 - 147.1 N·m,
13 - 15 kgf·m)
M16 × 1.5 mm
159 - 174 ft-lb
(215.7- 235.4 N·m,
22 - 24 kgf·m)
PT plug
1/8
7 ft-lb
(87 in.-lb, 9.8 N·m, 1.0 kgf·m)
–
1/4
14 ft-lb
(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)
3TNV88F_SVM_A4.book 25 ページ ２０１２年７月２６日 木曜日 午後６時４分
