Nuts and bolts that are either large or used for special applications need to meet a standard strength requirement. Hence, the grading in the name of this nut. Grade 8 bolt strength or class 8.8 means it’s high strength. 

This classification means the nut is medium carbon steel, quenched and tempered. All sizes below 16mm means they have a Proof Lead of 580MPa, minimum Yield Strength of 640 MPa, and minimum Tensile Strength of 800 MPa. On the other hand, those that are more than 16mm above have a Proof Lead of 600MPa, minimum Yield Strength of 660 MPa, and minimum Tensile Strength of 830 MPa. 

Grade 8 bolt strength is useful for motors, engines, railroad equipment, and processing equipment. This is because these bolts or nuts, as mentioned previously, have high tensile strength, enabling them to perform well in most environments. However, this is not advised in areas with extreme temperatures. 

If you are replacing an existing nut, make sure to get either the same or a higher grade. Don’t replace Grade 8 bolt strength with a Grade 5.

Hot dip galvanization means this nut underwent a process that will prevent corrosion. It started with chemical cleaning and ended with the coating process.