M5 x 10mm OD DIN 125 A2 Stainless Steel Type A Flat Washer / CROSS-SECTIONAL SHAPE STYLE: 1 RECTANGULAR HOLE DIAMETER: 5.3 MILLIMETERS MINIMUM AND 5.4 MILLIMETERS MAXIMUM PERIPHERAL SHAPE STYLE: 1 ROUND CENTER HOLE SHAPE STYLE: 1 ROUND THICKNESS: 0.9 MILLIMETERS MINIMUM AND 1.1 MILLIMETERS MAXIMUM OVERALL DIAMETER: 9.6 MILLIMETERS MINIMUM AND 10.0 MILLIMETERS MAXIMUM PART NAME ASSIGNED BY CONTROLLING AGENCY: NAVY SPECIAL PROJECT MATERIAL: STEEL CORROSION RESISTING OVERALL