DIN137 wave spring washer HRC40~52 balck oxide 65Mn Wave Spring Washer (DIN137)Material: Carbon Steel ,65Mn , 50crv4, C67, SK5, Stainless Steel....Size: M3~M30Thickness: 0.8mm~10mmSurface tretment: Black Oxide, Plain, ZP, HDG...Standard: ANSI/ASME, DIN, JIS, ISO, GB..Interested buyers ,Please tell us your specifications or send us your drawings and samples. DIN137 Wave Spring Washer