The M04020 Key is a vital component used in King packaging machinery to securely lock rotating parts, such as gears and pulleys, onto shafts, preventing slippage and ensuring accurate alignment. This durable key enables stable power transmission, which is essential for the efficient operation of tablet counting, liquid filling, cotton inserting, labelling, and capping machines. Built to endure high-demand production environments, the M04020 Key supports consistent performance, enhances machine reliability, and contributes to the longevity of King packaging equipment.