nut

With internal thread hole, the general shape of the flat six Angle type, also have a flat square shape or flat

Two or more than two parts fastening ground connection

For a whole USES a kind of

Parts of the body, on the market, also known as standard.

By the head and screw two form

Kind of fasteners, according to use can be divided into three categories

Machine screw, set screw and special purpose screw. The machine is mainly used for

fasteners

Two or more than two parts fastening connection to be a whole USES a kind of mechanical parts of the total