What is the meaning of 8.8 grade in a bolt?

The strength and toughness of a bolt are indicated by its 8.8 grade. The tensile strength of a bolt is shown using this metric measurement system. The nominal tensile strength of the bolt, expressed in units of 100 N/mm², is indicated by the number preceding the decimal point (8). Therefore, the nominal tensile strength of an 8.8 grade bolt is 800 N/mm². The ratio of the yield stress to the tensile strength is shown by the number (0.8) following the decimal point.

This practically means that when an 800 N tensile load is applied to an 8.8 grade bolt, it shouldn't break or distort. It also possesses some ductility, or the ability to bend under stress without breaking, and can withstand shearing pressures.

Higher grade bolts can be used in applications that call for greater strength and longevity because they often have higher tensile strengths. To guarantee safety and dependability, it is crucial to choose the appropriate quality of bolt for a certain application.