Tightening Fasteners
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
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.
Bolt diameter x pitch
(mm)
M6 x 1.0 M8 x 1.25 M10 x 1.5 M12 x 1.75 M14 x 1.5 M16 x 1.5
Tightening
Torque
N·m 11.0 ± 1.0 26.0 ± 3.0 50.0 ± 5.0 90.0 ± 10.0 140.0 ± 10.0 230.0 ± 10.0
kgf-m 1.1 ± 0.1 2.7 ± 0.3 5.1 ± 0.5 9.2 ± 1.0 14.3 ± 1.0 23.5 ± 1.0
lb-ft — 19.0 ± 2.1 37 ± 3.6 66.0 ± 7.2 103 ± 7.2 170 ± 7.2
lb-in. 96 ± 9.0 — — — — —
PERIODIC MAINTENANCE
54 JH4 Series Operation Manual
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