M10 x 20mm OD DIN 125 A4 Stainless Steel Type A Flat Washer / CROSS-SECTIONAL SHAPE STYLE: 1 RECTANGULAR HOLE DIAMETER: 10.50 MILLIMETERS MINIMUM AND 10.77 MILLIMETERS MAXIMUM PERIPHERAL SHAPE STYLE: 1 ROUND CENTER HOLE SHAPE STYLE: 1 ROUND THICKNESS: 1.8 MILLIMETERS MINIMUM AND 2.2 MILLIMETERS MAXIMUM OVERALL DIAMETER: 19.48 MILLIMETERS MINIMUM AND 20.00 MILLIMETERS MAXIMUM END ITEM IDENTIFICATION: MRAP-COUGAR AMBULANCE PART NAME ASSIGNED BY CONTROLLING AGENCY: M10 DIN 125 SS A4 FLAT WASHER MATERIAL: STEEL CORROSION RESISTING OVERALL SURFACE TREATMENT: ZINC OVERALL