Amazon.com: 20 Set M12 Steel Split Washer Lock Washer Spring Washer Ring and Flat Washer, Black Oxide Finish, 0.0984" and 0.138" Thick : Industrial & Scientific
Amazon.com: uxcell Nylon Flat Washers 15mm OD 5mm ID 1mm Thickness for Faucet Pipe Water Hose, Pack of 100 : Industrial & Scientific