BS4320A flat washers 1.Size:M3-M39 2.Material :carbon steel,stainless steel BS4320A flat washers1.Size:M3-M392.Standards:DIN ,ANSI/ASME,BS,GB,JIS,Non-standard3.Surface:plain,zinc plated,black oxide,hot dip galv.etc.4.Packing:general export package,according to clients`requirments.5.Delivery time:About 30days after placing order BS4320A Flat washer