Grade 8.8 Bolt

A Grade 8.8 bolt is a general purpose high strength bolt made from medium carbon steel that has been quenched and tempered. The grade refers to its minimum tensile strength.

A grade 8.8 bolt suits structural and general engineering joints. It takes a nut and often a washer of the same thread and class. A torque wrench sets it to the tension the joint needs.

Zinc plating coats the steel to resist corrosion. It is often used for indoor or light outdoor conditions.

Grade 8.8 bolts are often made in medium carbon steel that has been quenched and tempered. This treatment gives a good balance of strength and toughness.

This is a general guide to checking this kind of part. It says nothing about any supplier's parts.

Ask for a certificate of conformance or a mill test certificate to confirm the grade and material. On receipt, check the head marking for the grade, the thread condition and the plating quality. Also check that the length and diameter match your order.