which are used for fastening together with bolts or screws. According to different materials, all the components necessary for production and manufacturing machinery are divided into carbon steel, stainless steel, non-ferrous metal (such as copper) and other major types. According to the attributes, there are national standards, German standards, international standards, Japanese standards, American standards and other standards. Type of fixing nut: Stainless steel: self-locking nut, locknut, lock nut, four claw nut, screw in nut safety nut, fine rod screw connecting nut, self-locking hexagon cap nut special anchor screw nut, hexagon crown thin nut elevator nut. Welding square nut, welding hexagon nut, fastening nut, inlaid round nut, slotted round nut, side hole round nut, end face hole round nut, small round nut, round nut, ring nut, butterfly nut Copper: copper nut, inlaid copper nut, knurled copper nut, inlaid copper nut, injection copper nut, etc Alloy: zinc copper alloy n…