... Zinc plated 4.Size:M8-M36 5.Cert:ISO9001:2008 1.What’s the specification of our Hex Head Coupling Nut? 1.NameDIN 6334 Galvanized Hex Head Coupling Nut 2 ... butterfly nut;wing nut;2.StandardDIN934,DIN985,DIN315,DIN1587, ISO,JIS& ANSI,GB ,BS,ASTM, ... GR.A-GR.85.FinishPlain;black; zinc plated(Cr,3+);zinc plated(Cr,6+); hot dipped galvanized; dacromet;nickle plated;cadmium plated,etc.6.SizeM3-M80;1/4”~3-1 ...