5/16" x 0.688" OD Thru-Hardened Plain Finish Steel SAE General Purpose Flat Washer / CROSS-SECTIONAL SHAPE STYLE: 1 RECTANGULAR HOLE DIAMETER: 0.339 INCHES MINIMUM AND 0.359 INCHES MAXIMUM PERIPHERAL SHAPE STYLE: 1 ROUND CENTER HOLE SHAPE STYLE: 1 ROUND THICKNESS: 0.051 INCHES MINIMUM AND 0.080 INCHES MAXIMUM OVERALL DIAMETER: 0.681 INCHES MINIMUM AND 0.703 INCHES MAXIMUM END ITEM IDENTIFICATION: 2320-01-519-8173 COUGAR 4X4 EOD VARIANT; 2355-01-532-2174 JOINT EOD RAPID RESPONSE VEHICLE (JERRV) 4X4 EOD VARIANT; 2355-01-532-2159 JOINT EOD RAPID RESPONSE VEHICLE (JERRV) 6X6 ENGINEER VARIANT; 2320-01-519-8172 COUGAR 6X6 ENGINEER;RG-33 MRAP; MRAP RG-33 AUV PART NAME ASSIGNED BY CONTROLLING AGENCY: WASHER, FLAT COLOR: YELLOW OVERALL MATERIAL: STEEL OVERALL PROPRIETARY CHARACTERISTICS: NPAC SURFACE TREATMENT: ZINC OVERALL