M3 DIN 6797 Type A Zinc Plated External Tooth Lock Washer / HOLE DIAMETER: 3.20 MILLIMETERS MINIMUM AND 3.38 MILLIMETERS MAXIMUM OUTSIDE DIAMETER: 5.7 MILLIMETERS MINIMUM AND 6.0 MILLIMETERS MAXIMUM MATERIAL THICKNESS: 0.4 MILLIMETERS NOMINAL END ITEM IDENTIFICATION: MRAP - COUGAR CAT1 A2 SPECIAL FEATURES: HARDNESS RATING HRC 36-43 MATERIAL: STEEL OVERALL PROPRIETARY CHARACTERISTICS: NPAC SURFACE TREATMENT: ZINC OVERALL STYLE DESIGNATOR: 100 FLAT EXTERNAL TEETH