#5 x 0.438" OD 18-8 Stainless Steel Large OD Flat Washer / CROSS-SECTIONAL SHAPE STYLE: 1 RECTANGULAR HOLE DIAMETER: 0.133 INCHES MINIMUM AND 0.151 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: 0.430 INCHES MINIMUM AND 0.450 INCHES MAXIMUM END ITEM IDENTIFICATION: LCP MK 421 MO PART NAME ASSIGNED BY CONTROLLING AGENCY: WASHER, FLAT MATERIAL: STEEL CORROSION RESISTING OVERALL SURFACE TREATMENT: PASSIVATE OVERALL SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: ASTM A380 ASSN STD SINGLE TREATMENT RESPONSE OVERALL