... Fastener screw, 3.hardwere screw, ball screw 4.Screw bolt and nut 5.Standard: JIS, BS, DIN, AISI ... : carbon steel, stainless steel, metal, brass, copper, zinc alloy, cold rolled steel with various plating 2) Head ... hinge, binding, button, truss3) Surface treatment: kinds of plating (Zinc, Nikel, Chrome, Tin, Ag); Painting, Powder, Anodizing, E- ... screw brass standoff screw with threads blue zinc plated