MAINTENANCE
12/05
ZT370 Operation Manual
31
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.
TORQUE CHARTS
Standard Torque Values
Torque Specifications
Nominal designation of
screw thread
Standard tightening torque
M5
3.5 ± 0.5 N·m
2.6 ± 0.4 lb-ft
M6
6.0 ± 1.0 N·m
4.4 ± 0.6 lb-ft
M8
15 ± 2.0 N·m
11 ± 1.5 lb-ft
M10
30 ± 2.0 N·m
22 ± 1.5 lb-ft
M12
45 ± 2.0 N·m
33 ± 1.5 lb-ft
Item
Size
Torque
Nut for U-bolt of gimbal ring
M10
1.5
50 ± 5 N·m
37 ± 4 lb-ft
Bolt for anode of cylinder part
10 - 32 UNF
3.5 ± 0.5 N·m
2.6 ± 0.4 lb-ft
Bolt for rear cover
M8
1.25
6.0 ± 1.0 N·m
4.4 ± 0.7 lb-ft
Plug
M10
1.5
15 ± 2.0 N·m
11 ± 1.5 lb-ft
Bolt for valve assembly
M12
1.25
6.0 ± 1.0 N·m
4.4 ± 0.7 lb-ft
Bolt for rear of inner propeller
shaft
1 - 14 UNS
80 ± 5.0 N·m
59 ± 3.7 lb-ft
Bolt for rear of outer propeller
shaft
2-1/8 - 16 UNS
135 ± 5.0 N·m
100 ± 3.7 lb-ft
ZT370_OM.book 31 ページ ２０１３年９月２７日 金曜日 午前１０時１６分
