How is the grade strength of a bolt determined?

The grade strength of a bolt is determined by the material it is made of and the amount of cold working it has undergone. The material is typically steel, but other materials, such as stainless steel or brass, can also be used. The cold working process involves applying pressure to the bolt to increase its strength and hardness.

The grade strength of a bolt is indicated by a number that is followed by a letter. For example, a bolt with a grade strength of 5.8 has a tensile strength of 500 megapascals (MPa) and a yield strength of 800 MPa. The higher the grade strength, the stronger the bolt.

The grade strength of a bolt is important because it determines the amount of load that the bolt can safely support. A bolt with a higher grade strength can support a greater load than a bolt with a lower grade strength.

Bolts are also available with different head styles, such as hex heads, square heads, and button heads. The head style of a bolt is determined by the application it will be used in.

When selecting a bolt, it is important to choose the correct grade strength and head style for the application it will be used in.