5/8 Square Washer 0.688 ID 2.000 OD 0.170-0.200 Thk Steel USA - AMPG - Shoulder Screws, Shoulder Bolts, Sex Bolts, Flat Washers, Machine Screws and other fasteners
Grip Fast® 1/2" Class C Hot Dipped Galvanized Square Washer - 1 Count at Menards®
Beveled 316 Stainless Steel Square Washers
Square Washers Hot Dipped Galvanized - 5/8" (ID 11/16", OD 2", THK 0.125") - Qty-25: Amazon.com: Industrial & Scientific
Superstrut 3/8 in. Square Strut Washer Silver Galvanized (5-Pack) ZAB2413/8EG-10 - The Home Depot
B-Line B202DZN Zinc Plated NO Twist Square Washer | Cooper Electric