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STANDARD BOLT & NUT TIGHTENING TORQUE
Tightening torque of standard bolts and nuts are not indicated throughout the manual.
Use the charts and table below to judge the standard tightening torque.
1. Find the class of the bolt strength on the table below and then find the bolt tightening torque on the
tightening torque table.
2. The nut tightening torque can be judged from its corresponding bolt type.
BOLT STRENGTH CLASS IDENTIFICATION METHOD
Identification by bolt shape Identification by part No.
Shape and class Class
Hexagon
head bolt
Hexagon
bolt
(standard)
Bolt with raised
or etched
numeral on head
4 = 4T
5 = 5T
6 = 6T
7 = 7T
8 = 8T
No mark 4T
Hexagon
flange bolt
No mark 4T
Hexagon
head bolt
(standard)
Bolt with two
raised lines on
head
5T
Hexagon
flange bolt
Bolt with two
raised lines on
head
6T
Hexagon
head bolt
(standard)
Bolt with three
raised lines on
head
7T
Hexagon
head bolt
(standard)
Bolt with four
raised lines on
head
8T
Welded bolt 4T
Stud bolt
No mark 4T
2 mm groove(s)
on one/both
edge(s)
6T
Hexagon head bolt
Part No.
91611-40625
Length (mm)
Nominal diameter (mm)
Class
Stud bolt
Part No.
92132-40614
Length (mm)
Nominal diameter (mm)
Class
Nominal diameter
Length
Nominal diameter
Length
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