... : Stainles Steel,carbon steel long hex nut coupling nut :stainless steel ,carbon steel 1.a high tensile nut 2.size: M5-M64 3 ... .class : 2,4,6,8,10coupling nut :material: stainles steel ,carbon steel and other materials1.applicable to ... can be circular and hexagonal different and various special -shaped nut with long teeth hex coupling ...