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It is mostly used for connecting smaller parts. It has pan head screws, cylindrical head screws, semi-countersunk head screws and countersunk head screws. The screw head strength of pan head screws...

bm=1d double stud is generally used for the connection between two steel connected parts; bm=1.25d and bm=1.5d double stud is generally used for the connection between the cast iron connector...

According to the force mode of the connection, it is divided into ordinary and hinged holes. According to the shape of the head: hexagonal head, round head, square head, countersunk head and so on.