A secure propeller is essential for smooth and reliable performance on the water, and the Mercury Tab Washer (14-76281Q) is built to keep it that way. Acting as a critical locking mechanism, this tab washer ensures that your propeller nut stays firmly in place, preventing loosening from vibration and continuous engine operation. Without it, the risk of a shifting or detached propeller increases-something no boater wants to deal with mid-ride.. Designed specifically for Mercury and Mariner outboards (30-60 HP, non-Bigfoot models), this OEM tab washer is made from durable, corrosion-resistant materials that withstand the harsh marine environment. Whether replacing a worn washer or securing a new propeller installation, this small but vital component plays a big role in your boat's performance and safety.. Why It's a Must-Have:. Locks the Prop Nut in Place - Prevents loosening due to vibration and engine torque.. OEM Fit & Durability - Built to Mercury's exact specifications for seamless