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High-performance lock washer designed to prevent loosening of fasteners under vibration and torque. Features an outer diameter of 10 mm (0.39 in) and a nominal size of 5.30 mm (0.21 in) for versatile applications. Thickness of 0.60 mm (0.02 in) ensures a secure fit and reliable performance. Made from high quality general steel for durability and strength. Zinc finish provides excellent corrosion resistance and long-lasting protection.