heavy hex nut 1.standard: Din, ISO,JIS& ANSI,GB ... 3.white blue,zinc finish 4.iso rohs certificate heavy hex nut1.various kinds sizes of hex nut available. ... 2.high quality competive price.3.material of heavy hex nut:stainless steel ,carbon steel.4.surface treatment: ... BS and special spec according require.6.packing of our heavy hex nut:general export package or according require7.standard: ...