M20 x 37mm OD DIN 125 Low Carbon Yellow Zinc Finish Steel Type A General Purpose Flat Washer / CROSS-SECTIONAL SHAPE STYLE: 1 RECTANGULAR HOLE DIAMETER: 21.0 MILLIMETERS NOMINAL PERIPHERAL SHAPE STYLE: 1 ROUND CENTER HOLE SHAPE STYLE: 1 ROUND THICKNESS: 3.0 MILLIMETERS NOMINAL OVERALL DIAMETER: 37.0 MILLIMETERS NOMINAL END ITEM IDENTIFICATION: MRAP-COUGAR AMBULANCE PART NAME ASSIGNED BY CONTROLLING AGENCY: FLAT WASHER, M20 X 37MM, ZINC COLOR: YELLOW OVERALL MATERIAL: STEEL OVERALL SURFACE TREATMENT: ZINC OVERALL