1)Bolt: M6-M64 full thread or half thread(Hexagonal, socket head, pan head, countersunk head) 2)Nut: M3-M64 (hexagonal, flange) 1. Treatment: cold forging/hot forging2. Materials option: Stainless Steel C276, 904L, 304, 304L, 310S, 316, 316L, 321, 317L, 2507, 2205, 254SMO, AL6XN, 1. 4501, 1. 4529.Super duplex stainless steel F55, F51, F53 HastelloyB & C, Inconel, Incoloy etc.3. Standards: GB, DIN ...