1.M3-M33 (flat, big outside diameter, spring) 2.material:1.4539.904L,1. ... delivery time 4.Small order accept 1. Treatment: cold forging/hot forging2. Materials option: Stainless Steel C276, 904L, 304, 304L, 310S, 316, 316L ... , 2507, 2205, 254SMO, AL6XN, 1. 4501, 1. 4529.Super duplex stainless steel F55, F51, F53 HastelloyB & C, Inconel, Incoloy etc.3. Standards ...