... 3.Surface:Black,zinc,hdg,oxide 4.iso rohs approve hex head bolt 1. Standard:DIN931/933, DIN558/601; DIN6914, DIN960/961, ANSI ... . Material:Carbon steel, Alloy steel, stainless steel. 3. Grade of hex head bolt:Metric standard: Grade4.6, Grade 4.8, Grade5.6, Grade ... Dip Galvanized, Nickel, phosphate black, DACRO, etc. 7. Packing of hex head bolt:General packing: 15-25Kg per Carbon or Bag, approx 36 ...