... materials, woods and plastics. They have a high tensile strength value, and are durable enough to ... tapping screws: thread forming, thread cutting, and thread rolling.Specifications: Head: Pan head, Flat head, Indented hex head, Indented hex washer head, Serrated hex washer head, Truss head, Oval head ... .productShow(); oProductShow.init( { 'aImgSrc': aBigImageSrc } ); } )(); self tapping screw