3/8" 18-8 Stainless Steel Small OD Extra Thick Flat Washer / CROSS-SECTIONAL SHAPE STYLE: 1 RECTANGULAR HOLE DIAMETER: 0.396 INCHES MINIMUM AND 0.416 INCHES MAXIMUM PERIPHERAL SHAPE STYLE: 1 ROUND CENTER HOLE SHAPE STYLE: 1 ROUND THICKNESS: 0.111 INCHES MINIMUM AND 0.130 INCHES MAXIMUM OVERALL DIAMETER: 0.865 INCHES MINIMUM AND 0.885 INCHES MAXIMUM END ITEM IDENTIFICATION: HCU/60A CRADLE HARDNESS RATING: 36.0 ROCKWELL C MINIMUM AND 42.0 ROCKWELL C MAXIMUM PART NAME ASSIGNED BY CONTROLLING AGENCY: COMPONENT FLAT WASHER;SMALL OD EXTRA THICK FLAT WASHER MATERIAL: STEEL PROPERTY CLASS 18.8 OVERALL