1.machine screw 2.Fastener screw, 3.hardwere screw, ball screw 4.Screw bolt and nut 5.Standard: JIS, BS, DIN, AISI. Product name: machine screwRelated Products: wood screw, chipboard screw, ball screw, hex head screwbolt screw, bolts and nuts, self drilling screw, self tapping screw, machine screw, furniture screwdrywall screw, screw nut, screw cap,High strength boltsSpecification:1) Meterials: ...