5/8" x 1.303" OD Thru-Hardened Yellow Zinc Finish Steel SAE General Purpose Flat Washer for Grade 9 Applications / CROSS-SECTIONAL SHAPE STYLE: 1 RECTANGULAR HOLE DIAMETER: 0.641 INCHES MINIMUM AND 0.651 INCHES MAXIMUM PERIPHERAL SHAPE STYLE: 1 ROUND CENTER HOLE SHAPE STYLE: 1 ROUND THICKNESS: 0.136 INCHES MINIMUM AND 0.152 INCHES MAXIMUM OVERALL DIAMETER: 1.303 INCHES MINIMUM AND 1.323 INCHES MAXIMUM PART NAME ASSIGNED BY CONTROLLING AGENCY: FLAT WASHER COLOR: YELLOW OVERALL MATERIAL: STEEL OVERALL SURFACE TREATMENT: ZINC OVERALL