Dimensional deviation
Dimensional deviation is one of the common quality issues with bolts. This includes dimensions such as diameter, length, and threads that do not meet the design requirements. Exceeding the size tolerance may result in incorrect installation of bolts or loosening during use. To avoid this situation, manufacturers should strictly control the production process to ensure the accuracy of bolt dimensions.
Surface defect
Scratches, dents, rust and other defects may appear on the surface of the bolt. These defects not only affect the aesthetics of the bolts, but may also reduce their mechanical and corrosion resistance properties. Therefore, strict inspection of the bolt surface should be carried out during the production process to ensure surface quality.
Crack
Cracks are a serious quality issue with bolts, which may cause sudden breakage during use and result in safety accidents. The causes of cracks may be material quality issues, improper heat treatment, or stress concentration during processing. To avoid crack formation, strict inspection of raw materials should be carried out, and heat treatment and processing technology should be optimized.