... 8mm-250mm, same as hex nut .Other detais:1. Standard:DIN931/933, DIN558/601; DIN6914, DIN960/961, ANSI B18.2.1, BSW ... , Alloy steel, stainless steel or according require3. Grade of hex bolt:Metric standard: Grade 4.8, Grade6.8, Grade8.8, Grade10 ... , Nickel, phosphate black, DACROMET coating, etc.7. Packing of hex bolt:General packing: 20-25Kg per Carbon, 36-64Carbon/Pallet. or ...