The main function of square head bolts is to be used for mechanical lifting, also known as square head fastening bolts. Square head bolts usually need to be used with nuts, and their heads are square, which makes them very effective in fixing and adjusting mechanical components.

In addition, square head bolts are classified into high strength grades of 4.8, 8.8, 10.9, and 12.9, and are classified into iron bolts and stainless steel bolts according to their materials. Stainless steel bolts include types 1 such as SUS304, SUS201, and SUS316. These square head bolts of different grades and materials are suitable for different application scenarios to meet specific strength and corrosion resistance requirements.