Hex bolt 1.Bolt Size,M4-M100 2.Bolt Material,stainless steel,carbon steel 3.SGS,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&design.2. Material:Carbon steel, Alloy steel, stainless steel or according require3. Grade of hex bolt: Grade 4.8, Grade6.8, Grade8 ...