1/2" x 1.375" OD Thru-Hardened Plain Finish Steel USS General Purpose Flat Washer / CROSS-SECTIONAL SHAPE STYLE: 1 RECTANGULAR HOLE DIAMETER: 0.531 INCHES NOMINAL PERIPHERAL SHAPE STYLE: 1 ROUND CENTER HOLE SHAPE STYLE: 1 ROUND THICKNESS: 0.074 INCHES NOMINAL OVERALL DIAMETER: 1.062 INCHES NOMINAL END ITEM IDENTIFICATION: MRAP - COMMON NSN - USED ON MAXXPRO CAT I AND 4 OTHER WEAPON SYSTEMS PART NAME ASSIGNED BY CONTROLLING AGENCY: WASHER,.531 X 1.062 X .074