3/8" x 1.000" OD Low Carbon Zinc Finish Steel USS General Purpose Flat Washer / HOLE DIAMETER: 0.433 INCHES MINIMUM AND 0.453 INCHES MAXIMUM PERIPHERAL SHAPE STYLE: 1 ROUND CENTER HOLE SHAPE STYLE: 1 ROUND THICKNESS: 0.064 INCHES MINIMUM AND 0.104 INCHES MAXIMUM OVERALL DIAMETER: 0.868 INCHES MINIMUM AND 0.905 INCHES MAXIMUM MATERIAL: STEEL OVERALL MATERIAL DOCUMENT AND CLASSIFICATION: 66 FED STD SINGLE MATERIAL RESPONSE OVERALL