#12 18-8 Stainless Steel Small OD Flat Washer / CROSS-SECTIONAL SHAPE STYLE: 1 RECTANGULAR HOLE DIAMETER: 0.253 INCHES MINIMUM AND 0.263 INCHES MAXIMUM PERIPHERAL SHAPE STYLE: 1 ROUND CENTER HOLE SHAPE STYLE: 1 ROUND THICKNESS: 0.033 INCHES MINIMUM AND 0.047 INCHES MAXIMUM OVERALL DIAMETER: 0.495 INCHES MINIMUM AND 0.505 INCHES MAXIMUM END ITEM IDENTIFICATION: 2320-01-532-3599 MATERIAL: STEEL CORROSION RESISTING OVERALL SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: ASTM A380 ASSN STD SINGLE TREATMENT RESPONSE OVERALL