M4 x 9mm OD DIN 125 A2 Stainless Steel Type A Flat Washer / CROSS-SECTIONAL SHAPE STYLE: 1 RECTANGULAR HOLE DIAMETER: 4.30 MILLIMETERS MINIMUM AND 4.48 MILLIMETERS MAXIMUM PERIPHERAL SHAPE STYLE: 1 ROUND CENTER HOLE SHAPE STYLE: 1 ROUND THICKNESS: 0.70 MILLIMETERS MINIMUM AND 0.90 MILLIMETERS MAXIMUM OVERALL DIAMETER: 8.64 MILLIMETERS MINIMUM AND 9.00 MILLIMETERS MAXIMUM END ITEM IDENTIFICATION: 3810-01-607-9674 PART NAME ASSIGNED BY CONTROLLING AGENCY: M4, FLAT WASHER MATERIAL: STEEL COMP A2 OVERALL SURFACE TREATMENT: PASSIVATE OVERALL SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: ASTM A380 ASSN STD SINGLE TREATMENT RESPONSE OVERALL