Suzuki Wagon R Plus RB310, Service Manual

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GENERAL INFORMATION 0A-27
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 origi-
nal 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 divi-
sion.
Metric bolts: Identification class numbers or marks correspond to bolt strength (increasing 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
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 orig-
inal fastener.
1. Nut strength identification
NOTE:
• For the flanged bolt, flanged nut and self-lock nut of 4T and 7T strength, 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 light alloy.