Mercury Screw - 10-8M0129747. The Mercury Screw (10-8M0129747) is an OEM-grade fastener built to deliver lasting security and a precise fit in Mercury and MerCruiser marine engines. Whether you're performing a detailed repair or replacing worn-out hardware, this screw offers the strength and corrosion resistance needed in harsh marine environments. It's a small part that plays a big role in keeping your engine running smoothly.. Key Features. OEM Quality - Manufactured by Mercury for exact fit a