BOLT
&
NUT TIGHTENING TORQUES
Standard Bolt
&
Nut Tightening Torque
Tightening torques of standard bolts and nuts are not indicated throughout the manual.
Use the procedures and table below to judge the standard tightening torque.
1.
Judge the tightening torque for the hexagon head bolt, welded bolt or stud bolt having the standard bearing
surface according to the tightening torque table by identifying the bolt strength class from the table below.
2.
Judge the tightening torque for the hexagon flange bolt based on the threading diameter.
3.
The nut tightening torque can be judged from its corresponding bolt type by using procedure
1.
BOLT STRENGTH CLASS IDENTIFICATION METHOD AND
TIGHTENING TORQUE
Identification
by
Actual Part
Hexagon head bolt
(standard bearing
surface)
Welded bolt
Stud bolt
Shape and Strength class
@
Number in relief or hallmark on head
0
No mark
8
Bolt with two raised lines on head
0
Bolt with three raised lines on head
8
Bolt with four raised lines on head
No mark
About
2
mm (0.08 in.) groove@) on onelboth edge(@
Strength class
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