Suzuki WagonR+ RB310, Service Manual

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METRIC BOLTS-IDENTIFICATION CLASS NUMBERS
OR MARKS CORRESPOND TO BOLT
STRENGTH-INCREASING NUMBERS REPRESENT
INCREASING STRENGTH.
NUT STRENGTH
IDENTIFICATION
GENERAL INFORMATION 0A-23
METRIC INFORMATION
METRIC FASTENERS
Most of the fasteners used for this vehicle are JIS-defined and ISO-
defined metric fasteners. When replacing any fasteners, it is most
important that replacement fasteners be the correct diameter,
thread pitch and strength.
CAUTION:
Even when the nominal diameter (1) of thread is the same,
the thread pitch (2) or the width across flats (3) may vary be-
tween ISO and JIS. Refer to JIS-TO-ISO Main Fasteners
Comparison Table below for the difference.
Installing a mismatched bolt or nut will cause damage to the
thread.
Before installing, check the thread pitch for correct match-
ing and then tighten it by hand temporarily. If it is tight, re-
check the thread pitch.
JIS-TO-ISO Main Fasteners Comparison Table
Nominal diameter
M6 M8 M10 M12 M14
Standard
M6 M8 M10 M12 M14
Thread pitch 1.0 1.25 1.25 1.25 1.5
JIS
Width
across flats
10 12 14 17 19
Thread pitch 1.0 1.25 1.5 1.5 1.5
ISO
Width
across flats
10 13 16 18 21
FASTENER STRENGTH IDENTIFICATION
Most commonly used metric fastener strength property classes are
4T, 6.8, 7T, 8.8 and radial line with the class identification embossed
on the head of each bolt. Some metric nuts will be marked with
punch, 6 or 8 mark strength identification on the nut face. Figure
shows the different strength markings.
When replacing metric fasteners, be careful to use bolts and nuts
of the same strength or greater than the original fasteners (the
same number marking or higher). It is likewise important to select
replacement fasteners of the correct diameter and thread pitch.
Correct replacement bolts and nuts are available through the parts
division.