ASME/ANSI standard Spring washer  covers the dimensional requirments of inch series Spring WASHER.The standard of ASME/ANSI standard Spring washer  is ASME/ANSI B18.21.1 . The Spring washer is widely used,Website:http://www.chinajinrui.net, mainly goes with bolt and screw. mostly made from steel 65Mn and steel #70 with high hardness  StandardGradeFinshASME/ANSI B18.21.65Mn     white zinc      yellow zinc black oxide      H.D.G       Dacromet      ...#70