... hex bolts and nuts with all sizes.2. Treatment:cold forging/hot forging3.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 ... .4.Standards: GB , DIN, ANSI/AMSE, JIS and BS, etc.5. ...