1987 SUZUKI GRAND VITARA Service Repair Manual

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O-5. METRIC INFORMATION
METRIC FASTENERS
Most of the fasteners used for this vehicle are
metric. When replacing 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. Fig. O-10 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 impor-
tant to select replacement fasteners of the
correct size. Correct replacement bolts and
nuts are available through the parts department.
NUT STRENGTH
IDENTIFICATION
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METRIC BOLTS - IDENTIFICATION CLASS NUMBERS OR MARKS CORRESPOND TO
BOLT STRENGTH - INCREASING NUMBERS REPRESENT INCREASING STRENGTH.
Fig. O- 10 Bolt Strength Markings
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STANDARD TIGHTENING TORQUE
Each fastener should be tightened to the torque specified in each section of this manual. If no description
or specification 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 fastener.
NOTE:
l For the flanged bolt and nut, add 10% to the tightening torque given in the below chart
l The below chart is applicable only where the fastened parts are made of steel or light alloy.
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