PERIODIC MAINTENANCE
28 SD25 Operation Manual
TIGHTENING FASTENERS
Use the correct amount of torque when tightening fasteners. Applying excessive torque
may damage the fastener or component and too little torque may cause a leak or
component failure.
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 CHARTS
Standard Torque Values
Standard Torque Chart
M6 1.0 M8 1.25
M10 1.25
or 1.5
M12 1.25
or 1.75
M14 1.5 M16 1.5
Cast Iron or
Steel
N·m 10.8 ± 1.0 25.5 ± 2.0 49.1 ± 4.9 88.3 ± 10.0 137.2 ± 4.9 225.4 ± 10.0
lb-ft 8.0 ± 0.8 18.8 ± 1.5 36.2 ± 3.6 65.1 ± 7.4 101.2 ± 3.6 166.2 ± 7.4
Aluminum
N·m 8.8 ± 1.0 20.6 ± 2.0 39.2 ± 2.0 70.6 ± 4.9 109.8 ± 4.9 180.3 ± 10.0
lb-ft 6.5 ± 0.8 15.2 ± 1.5 28.9 ± 1.5 52.1 ± 3.6 81.0 ± 3.6 133.0 ± 7.4
Thread size × Pitch
mm
M6 1.0 M8 1.25 M10 1.5 M12 1.75 M14 1.5 M16 1.5
Tightening
torque
lb-in. 96.0 ± 9.0 –– – – –
lb-ft – 19.0 ± 2.0 36.0 ± 4.0 65.0 ± 7.0 101.0 ± 7.0 167.0 ± 7.0
N·m 10.8 ± 1.0 25.5 ± 2.9 49.0 ± 4.9 88.3 ± 9.8 137.0 ± 9.8 226.0 ± 9.8
kgf·m 1.1 ± 0.1 2.6 ± 0.3 5.0 ± 0.5 9.0 ± 1.0 14.0 ± 1.5 23.0 ± 2.0
SD25_OPM.book 28 ページ ２０１４年６月２７日 金曜日 午後５時２９分
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