Engine: Tightening Torques; Tightening Torques For General Use Screws, Bolts And Nuts - Kubota KX080-3 Workshop Manual

WSM KX080-3 Service
3. TIGHTENING TORQUES
Screws, bolts and nuts must be tightened to the specified torque using a torque wrench, several screws, bolts and
nuts such as those used on the cylinder head must be tightened in proper sequence and the proper torque.
[1] TIGHTENING TORQUES FOR GENERAL USE SCREWS, BOLTS AND
NUTS
When the tightening torques are not specified, tighten the screws, bolts and nuts according to the table below.
Grade
Nominal Unit
N·m
Diameter
M6 7.9 to 9.3
M8 17.7 to 20.6
M10 39.2 to 45.1
M12 62.8 to 72.6
Screw and bolt material grades are shown by numbers punched on the screw and bolt heads. Prior to
tightening, be sure to check out the numbers as shown below.
Punched number
None or 4 Standard screw and bolt SS41, S20C
7 Special screw and bolt S43C, S48C (Refined)
Standard Screw and Bolt
kgf·m
0.80 to 0.95 5.8 to 6.9
1.8 to 2.1 13.0 to 15.2
4.0 to 4.6 28.9 to 33.3
6.4 to 7.4 46.3 to 53.5
Screw and bolt material grade
III-S-100
Special Screw and Bolt
ft-lbs N·m
9.8 to 11.3
23.5 to 27.5
48.1 to 55.9
77.5 to 90.2
Engine
kgf·m ft-lbs
1.00 to 1.15 7.23 to 8.32
2.4 to 2.8 17.4 to 20.3
4.9 to 5.7 35.4 to 41.2
7.9 to 9.2 57.1 to 66.5
W10371750
W1012705