Daihatsu F300 Service Manual page 1073

APPENDIX
2. TIGHTENING TORQUE FOR MAIN COMPONENTS
1. When you want to find out a suitable tightening torque for a bolt, first determine the strength division of
the said bolt, using the table below. Then, locate suitable tightening torque in the tightening torque table
described later.
2. As for the tightening torque for a nut, find out suitable tightening torque in the same way as
with
the
paragraph 1 above, based on the mating bolt.
3. Tightening torque posted in the workshop manual is a standard value for steel fasteners. It is, therefore,
necessary to tnodify these tightening torque when you tighten fasteners made of materials other then
steel.
This rule also applies to such instances where bolts are undergoing heat or other stress, such as vibratory
loads and so forth.
METHOD TO IDENTIFY STRENGTH DIVISION OF BOLTS
1. Identification Method by Checking Bolts Themselves
Configuration and how to determine Strength Configuration and how to determine Strength
strength division division strength division division
®
Bolt having an 4
=
4T
~
embossed or
5 = ST
Welded
4T
stamped figure at its
5 = ST bo~
head section
7 = 7T
0
No
marl< 4T
'
No mark
4T
Hexagon
bo~
0
Bolt having two
ST
Stud
bolt
embossed lines at its
head section
6T
'
Bolt having about
2mmdeep
6T
recess at one
0
Bolt
having three
~
end or both ends
embossed lines
at
its
7T
head section
.,..,..,,
2 Identification Method by Part Numbers
Hexagon Boll
Stud Boll
Part number 9 1 1 1
1-·r
Part
number 9 1 1 1 1-40620
example
LNominal
example
Ll_Nanlnal
length {mm) length (mm)
Nominal Nominal
diameter (mm)
diameter (mm)
--j
Strength division
J
-----1
Strength division
I
~I
Nominal
10-
mllmiNominal
d1ameter diameter
Nomainallength
I
Length
I
-
.
WFE90-A012
A-10
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