Suzuki RA410, Manual

Page: 24 / 761

METRIC INFORMATION
METRIC FASTENERS
Most of the fasteners used for this vehicle are metric. When replac-
ing any fasteners, it is most important that replacement fasteners
be the correct diameter, thread pitch and strength.
FASTENER STRENGTH IDENTIFICATION
Most commonly used metric fastener strength property classes are
4T, 7T and radial line with the class identification embossed on the
head of each bolt. Some metric nuts will be marked with punch
mark strength identification on the nut face. Figure shows the dif-
ferent 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 size. Correct replacement
bolts and nuts are available through the parts division.
METRIC BOLTS-IDENTIFICATION CLASS NUMBERS OR
MARKS CORRESPOND TO BOLT STRENGTH-INCREAS-
ING NUMBERS REPRESENT INCREASING STRENGTH.
STANDARD TIGHTENING TORQUE
Each fastener should be tightened to the torque specified in each section of this manual. If no description or specifi-
cation is provided, refer to the following tightening torque chart for the applicable torque for each fastener. When
a fastener of greater strength than the original one is used, however, use the torque specified for the original fas-
tener.
NOTE:
For the flanged bolt and nut, add 10% to the tightening torque given in the chart below.
The chart below is applicable only where the fastened parts are made of steel or light alloy.
Conventional bolt “4T” bolt
“7T” bolt
GENERAL INFORMATION 0A-21
STRENGTH
THREAD
DIAMETER
(mm)
N
.
m kg-m lb-ft N
.
m kg-m lb-ft
4 1.5 0.15 1.0 2.3 0.23 2.0
5 3.0 0.30 2.5 4.5 0.45 3.5
6 5.5 0.55 4.0 10 1.0 7.5
8 13 1.3 9.5 23 2.3 17.0
10 29 2.9 21.0 50 5.0 36.5
12 45 4.5 32.5 85 8.5 61.5
14 65 6.5 47.0 135 13.5 98.0
16 105 10.5 76.0 210 21 152.0
18 160 16 116.0 240 24 174.0