Fasteners

FASTENERS

Fastener Strength Identification:

This vehicle is equipped with mostly metric fasteners. The most commonly used metric fastener strength property classes are 4T, 6.8, 7T, 8.8 and radial line.The class identification is embossed on the head of each bolt (1). The class identification numbers or marks correspond to the bolt strength. For example,increasing numbers represent increasing strength. Some metric nuts (2) are marked with a punch (3) or a single digit strength identification number on the nut face.
Replace fasteners with those of the same strength or greater. It is also important to select replacement fasteners that are of the same diameter and thread pitch as the original fastener. The correct fasteners are available through GM Service Parts Operations (SPO).

Standard Tightening Torque
Each fastener should be tightened to the specific torque value given. If a specification is missing, use the tightening torque charts below in order to obtain the correct torque for the fastener. When a fastener of greater strength than the original one is used, use the torque specified for the original fastener.

4T Strength Fasteners:

6.8 Strength Fasteners Without A Flange:

6.8 Strength Fasteners With A Flange:

7T Strength Fasteners:

8.8 Strength Fasteners Without A Flange:

The charts above are applicable only where the fastened parts are made of a steel light alloy.