PERIODIC MAINTENANCE
38
8LV Series Operation Manual
■ Standard Tightening Torque
The tightening torque in the Standard Torque Chart 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.
■ Torque for Pipe Joint Bolts
Note: Do not apply oil on bolts.
■ Torque for Piping Taper Screw
Thread Diameter M6 M8 M10 M12 M10 M12
Pitch mm 1.0 1.25 1.5 1.75 1.25 1.25
Width across flat mm 10 12 14 17 14 17
Tightening torque
N·m
(kgf·m)
10.8 ± 1
(1.1 ± 0.1)
25.5 ± 3
(2.6 ± 0.3)
49 ± 5
(5.0 ± 0.5)
88.2 ± 10
(9.0 ± 1.0)
52 ± 5
(5.3 ± 0.5)
93 ± 10
(9.5 ± 1.0)
Thread Diameter M8 M10 M12 M14 M16
Pitch mm 1.25 1.25 1.25 1.5 1.5
Width across flat mm 14 14 17 19 22
Tightening torque
N·m
(kgf·m)
14.7 ± 2
(1.5 ± 0.2)
22.5 ± 3
(2.3 ± 0.3)
29.4 ± 5
(3.0 ± 0.5)
44.1 ± 5
(4.5 ± 0.5)
53.9 ± 5
(5.5 ± 0.5)
Thread Diameter 1/8 1/4 3/8 1/2
Tightening torque
N·m
(kgf·m)
9.8
(1.0)
19.6
(2.0)
29.4
(3.0)
58.8
(6.0)
8LV_OPM.book 38 ページ ２０１１年１月１１日 火曜日 午後１２時８分
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