Hillman Stainless Steel Flat Washer (3/4" Screw Size) 43759 - The Home Depot
US / Inch - SAE Flat Washers, Cr+3 Zinc Plated Steel, #4 #6 #8 #10 1/4 5/16 3/8" | eBay
3/4 Machined Washer 0.781 ID 1.625 OD 0.151-0.161 Thk Steel Case Hard USA - AMPG - Shoulder Screws, Shoulder Bolts, Sex Bolts, Flat Washers, Machine Screws and other fasteners