... :4-2000mmheavy hex bolts and nuts with all sizes are also available. 2.Materials option: Stainless Steel C276, 904L, 304, 304L,310S, 316 ... , 2507, 2205, 254SMO, AL6XN, 1.4501,1.4529.Super duplex stainless steel F55, F51,F53 HastelloyB&C, Inconel, Incoloy etc. 3.Standards ...