M4 DIN 137 Mechanical Zinc Finish Wave Washer / HOLE DIAMETER: 4.3 MILLIMETERS MINIMUM AND 4.6 MILLIMETERS MAXIMUM OUTSIDE DIAMETER: 8.63 MILLIMETERS MINIMUM AND 9.38 MILLIMETERS MAXIMUM OVERALL HEIGHT: 1.0 MILLIMETERS MINIMUM AND 2.0 MILLIMETERS MAXIMUM MATERIAL THICKNESS: 0.45 MILLIMETERS MINIMUM AND 0.55 MILLIMETERS MAXIMUM END ITEM IDENTIFICATION: 4210-01-622-0440; MRAP - M-ATV PART NAME ASSIGNED BY CONTROLLING AGENCY: WASH, WAVE M4X9X.5 ZP SPECIAL FEATURES: FINISH PER ISO 4042 MATERIAL: STEEL OVERALL SURFACE TREATMENT: ZINC OVERALL STYLE DESIGNATOR: 22 SPRING TENSION