Hex bolt is used most frequently in the bolt type a, its external thread of the main function is to cooperate with nut. Using this method of threaded connection, make the one with two parts. Class C hex bolt is mainly used in the surface is rough, the steel structure of the accuracy is not high machinery, equipment. Class A and class B, hex bolt is mainly used in the surface is bright and clean, to high precision mechanical equipment. My company produces THE brand stainless steel hex bolt are grade A hex bolt.
Fine tooth and tooth lines generally divided into coarse thread two kinds, coarse thread of the bolt is more widely used. Fine thread self-locking of bolt is good, it is mainly used for thin-walled parts and a hard structure