hex head bolt 1.Standard:DIN, ANSI/ASME, BS, AS 2.hex bolt Size: M8-M100 3.Surface:Black,zinc,hdg,oxide 4.iso rohs approve hex head bolt 1 ... , Alloy steel, stainless steel. 3. Grade of hex head bolt:Metric standard: Grade4.6, Grade 4.8, Grade5.6, Grade 5.8, Grade6.8, Grade8.8, Grade10 ... -72mm, Inch size from 1/8"-2-1/2". 5. Length of hex head bolt:0-3000mm or 0-10. 6. Surface treatment:Plain ...