Detailed Product Description Bolt&Nut:1). Head types: hexagon head, pan head, round flange head, flat head, countersunk head2) Hex nut: M2 to M1353) Hex bolt: M3 to M484) Material: mild steel, 35C, 45C, SUS304, SUS316, brass, other material is available5) Standards: DIN934 & ANSI B18.2.2 & JIS B1181, DIN931, DIN933 , other standard is available..