... -200mm. same as hex nut.C, carbon steel, grade 4.8, grade 8.8, M5-M24, length between 8mm-250mm, same as hex ... require3. Grade of hex bolt:Metric standard: Grade 4.8, Grade6.8, Grade8.8, Grade10.9,Grade12.9.Inch standard: Grade2, Grade5, Grade8 ... hex boltMaterialStailess steel SS301, SS304 SS316 SS430,etc, carbon, grade4.8-12.9Finishnickel plated, passivation,black oxide,self color SizeM4-100Length6mm ...