... ,ISO 4.Zinc or Nickel plated,Black Oxide,HDG Hex bolt1. Standard of hex bolt:DIN931/933, DIN558/601; DIN6914, DIN960/961, ANSI B18 ... .2.1, BSW, JSB ans ISO standard or non-standard as request ... according require3. Grade of hex bolt: Grade 4.8, Grade6.8, Grade8.8, Grade10.9,Grade12.9.Inch standard: Grade2, Grade5, Grade8, B7 ...