standard: Din, ISO,JIS& ANSI,GB ,BS. Size from M3 to M56 material:carbon steel finish with plain,zp,yzp, black , hdg standard: Din, ISO,JIS& ANSI,GB ,BS. material:carbon steel , Size from m3 to m56 finish with plain,zp,yzp, black , hdgsurface treatment: H.D.G or originalproduct grade: A Cooperating with the use of bolt, this product as a fastenercan be widely used in industry engineering, FACTORY ...