... length between 8mm-250mm, same as hex nut .Other detais:1. Standard:DIN931/933, DIN558/601; DIN6914, ... ANSI B18.2.1, BSW, JSB ans ISO standard.2. Material:Carbon steel, Alloy steel, stainless ... steel or according require3. Grade of hex bolt:Metric standard: Grade 4.8, Grade6.8, Grade8.8 ... , Grade10.9,Grade12.9.Inch standard: Grade2, Grade5, Grade8, B7.stainless steel , ...