25pcs) DIN 125 M39 Flat Washers (40mm ID) Type A A4 Stainless Steel, Ships Free in USA by Aspen Fasteners, ASSP01254400: Amazon.com: Industrial & Scientific
Steel Flat Washer, Zinc Plated Finish, DIN 125, Metric, M10 Screw Size, 10.5 mm ID, 20 mm OD, 2 mm Thick (Pack of 100): Amazon.com: Industrial & Scientific