1/2" x 1.375" OD Low Carbon Zinc Finish Steel USS General Purpose Flat Washer Made in USA / CROSS-SECTIONAL SHAPE STYLE: 1 RECTANGULAR HOLE DIAMETER: 0.563 INCHES NOMINAL PERIPHERAL SHAPE STYLE: 1 ROUND CENTER HOLE SHAPE STYLE: 1 ROUND OVERALL DIAMETER: 1.375 INCHES NOMINAL END ITEM IDENTIFICATION: NSN 4940-01-591-0265 PART NAME ASSIGNED BY CONTROLLING AGENCY: LOW CARBON FLAT WASHER MATERIAL: STEEL OVERALL SURFACE TREATMENT: ZINC OVERALL