Chevrolet Cruze manuals

Chevrolet Cruze Repair Manual: 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 strength.

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.

GM Engineering Standards and 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.

Fastener Strength Identification

  1. English Bolt, Grade 2 (Strength Class)
  2. English Bolt, Grade 5 (Strength Class)
  3. English Bolt, Grade 7 (Strength Class)
  4. English Bolt, Grade 8 (Strength Class)
  5. Metric Nut, Strength Class 9
  6. Metric Bolts, Strength Class Increases as Numbers Increase

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.

The correct fasteners are available through GM SPO. 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:

The metric fasteners on GM products are designed to new, international standards. The following are the common sizes and pitches, except for special applications:

Fasteners
Table 1: Metric Prevailing Torque Fastener Minimum Torque Development Table 2: English Prevailing Torque Fastener Minimum Torque Development ...

Prevailing Torque Fasteners
Prevailing torque fasteners create a thread interface between the fastener and the fastener counterpart in order to prevent the fastener from loosening. All Metal Prevailing Torque Fasteners Thes ...

Other materials:

Radio Reception
Frequency interference and static can occur during normal radio reception if items such as phone chargers, vehicle convenience accessories, and external electronic devices are plugged into the accessory power outlet. If there is interference or static, unplug the item from the accessory power ...

Safety Belt Extender
If the vehicle's safety belt will fasten around you, you should use it. But if a safety belt is not long enough, your dealer will order you an extender. When you go in to order it, take the heaviest coat you will wear, so the extender will be long enough for you. To help avoid personal inju ...

Windshield Washer Pump Replacement
Removal Procedure Remove the front wheelhouse liner. Refer to Front Wheelhouse Liner Replacement. Disconnect the washer pump electrical connector (1). Disconnect the washer pump hose (2) from the washer pump (3). Using a small flat-bladed tool, remove the washer pump from the washer ...

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