5/8" x 1.312" OD Low Carbon Zinc Finish Steel SAE General Purpose Flat Washer / CROSS-SECTIONAL SHAPE STYLE: 1 RECTANGULAR HOLE DIAMETER: 0.625 INCHES NOMINAL PERIPHERAL SHAPE STYLE: 1 ROUND CENTER HOLE SHAPE STYLE: 1 ROUND THICKNESS: 0.095 INCHES NOMINAL OVERALL DIAMETER: 1.312 INCHES NOMINAL END ITEM IDENTIFICATION: 4940-01-591-0265 MATERIAL: STEEL OVERALL SURFACE TREATMENT: ZINC OVERALL