... from M6to M48. 3.Surface.galvanized.plated copper DIN125A Plain washer 1.Grade: 4.8 2.Size: M3-M52 3. ... Equipment: 200ton-315ton's hydraulic press,bending machine,steel plate shearer,spot-welder,Sub-arc welding machine,punching machine,numerical ... , Architectural Decoration finishing, boiler, Auto Manufacture, Fixture of Steel plate plasterboard etc.Our factory can produce the screw nails according ...