On a boat, even the smallest fastener can make the difference between rock-solid reliability and something working loose at the worst possible moment. The Mercury Marine Screw - 8M4501000 is one of those essential pieces of hardware — built to secure key components and hold tight through vibration, water exposure, and the constant stress of marine operation.

This isn’t just any off-the-shelf screw. Precision-machined to meet Mercury’s exact specs, it threads cleanly into place without risk of cross-threading or stripping. Its corrosion-resistant construction stands up to relentless salt spray, humidity, and the natural wear-and-tear that comes with life on the water. Whether it’s part of a major assembly or anchoring a critical cover or bracket, this screw is designed to keep things right where they belong — trip after trip.

Why it belongs in your toolkit:

• Genuine Mercury part — exact fit for select engines and systems
• Marine-grade construction resists corrosion and thread degradation
• Engineered for secure grip even under vibration and shock loads
• Precision threading for easy installation without stripping or binding

Ideal for:

1. Replacing lost or corroded hardware during maintenance
2. Securing critical components in high-vibration areas
3. Ensuring reliable fastening in both saltwater and freshwater conditions

It’s a small part, but the right screw does more than hold things together — it helps keep your whole system running right.