... flange washer:M3-M33 flat, big outside diameter, spring 1. Treatment: cold forging/hot forging2. Materials option: Stainless Steel ... , 254SMO, AL6XN, 1. 4501, 1. 4529.Super duplex stainless steel F55, F51, F53 HastelloyB & C, Inconel, Incoloy etc. ... Standards: GB, DIN, JIS, AISI/ASTM/ANSI/AMSE and BS EN, etc.4. Packing: Cartons then pallet, ... .6. factory price, accept small order and short delivery time