M6 DIN 137 Mechanical Zinc Finish Wave Washer / HOLE DIAMETER: 6.4 MILLIMETERS NOMINAL OUTSIDE DIAMETER: 12.0 MILLIMETERS NOMINAL MATERIAL THICKNESS: 0.5 MILLIMETERS NOMINAL END ITEM IDENTIFICATION: 4220-01-617-9406 PART NAME ASSIGNED BY CONTROLLING AGENCY: WASHER WAVE MATERIAL: STEEL OVERALL SURFACE TREATMENT: ZINC OVERALL STYLE DESIGNATOR: 3 SPRING TENSION