Metric Fasteners; Fastener Strength Identification - Suzuki XL7 2007 Service Manual

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Metric Fasteners

This vehicle provides fastener dimensions using the metric system. Most metric fasteners are approximate in diameter

to equivalent English fasteners. Make replacements using fasteners of the same nominal diameter, thread pitch, and

A number marking identifies the OE metric fasteners except cross-recess head screws. The number also indicates the

strength of the fastener material. A Posidrive® or Type 1A cross-recess identifies a metric cross-recess screw. For

best results, use a Type 1A cross-recess screwdriver, or equivalent, in Posidrive® recess head screws.

North American Industries have adopted a portion of the ISO-defined standard metric fastener sizes. The purpose was

to reduce the number of fastener sizes used while retaining the best thread qualities in each thread size. For example,

the metric M6.0 X 1 screw, with nearly the same diameter and 25.4 threads per inch replaced the English 1/4-20 and

1/4-28 screws. The thread pitch is midway between the English coarse and fine thread pitches.

1. English Bolt, Grade 2 (Strength Class)

2. English Bolt, Grade 5 (Strength Class)

3. English Bolt, Grade 7 (Strength Class)

The most commonly used metric fastener strength property classes are 9.8 and 10.9. The class identification is

embossed on the head of each bolt. The English, inch strength classes range from grade 2 to grade 8. Radial lines are

embossed on the head of each bolt in order to identify the strength class. The number of lines on the head of the bolt

is 2 lines less than the actual grade. For example, a grade 8 bolt will have 6 radial lines on the bolt head. Some metric

nuts are marked with a single digit strength identification number on the nut face.

Many metric fasteners available in the aftermarket parts channels are designed to metric standards of countries other

than the United States, and may exhibit the following:

• Lower strength

• No numbered head marking system

• Wrong thread pitch

4. English Bolt, Grade 8 (Strength Class)

5. Metric Nut, Strength Class 9

6. Metric Bolts, Strength Class Increases as Numbers Increase

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