【Perfect Compatibility】 Specifically designed for Mercury MerCruiser outdrives. Fits all Alpha One, Pre Alpha, Generation 2, Bravo One, and TRS units. Also compatible with Mercury/Mariner outboards 150HP and up. 【Exact OEM Replacement】 Directly replaces Mercury part numbers 91-36235, 91-17256, Sierra 18-9803, and GLM 90100. A must-have DIY tool for removing and installing driveshaft housing (upper) bearing retainer nuts. 【Heavy-Duty Construction】 Forged from high-grade alloy steel with a black oxide finish. This spanner wrench is built for high torque, ensuring rust resistance and lifelong durability. 【Professional Design】 Features a 1/2-inch socket driver for use with breaker bars or torque wrenches. Precisely engineered to fit the 4-3/8" retainer nut without slipping, protecting your expensive marine parts from damage. 【Purchase Note】 Please verify your part number before purchase. Note: Will NOT fit Bravo 2, 3, XR, or TR units.

Professional Grade Spanner Bearing Carrier Nut Wrench Tool

Are you struggling to remove the stubborn bearing carrier retainer nut on your MerCruiser outdrive? The Endxedo 1/2" Drive Spanner Wrench is the professional-grade solution designed for DIY boaters and marine mechanics alike. It ensures a precise fit and maximum leverage for even the toughest maintenance tasks.

Engineered for Precision & Strength

Precision-cut teeth ensure a non-slip fit on the 4-3/8" retainer nut, preventing accidental damage to expensive marine components. The integrated 1/2-inch square drive allows for a seamless connection to your breaker bar or torque wrench, providing the necessary mechanical advantage for high-torque applications.

Built to Last in Marine Environments

Forged from high-tensile alloy steel, this tool features a specialized black oxide finish that acts as a rugged shield against external elements and salt-water rust. This construction provides long-lasting surface integrity and a physical barrier against wear, ensuring your tool remains a reliable part of your toolbox season after season.

Broad Compatibility & OEM Replacement

This tool is a direct replacement for 91-36235, 91-17256, and 18-9803. It is specifically designed for:

• Fit for Mercury MerCruiser Alpha One, Pre Alpha, and Generation 2 units.
• Fit for MerCruiser Bravo One and TRS units.
• Fit for Mercury/Mariner outboards 150HP and up.

Note: Please verify your part number before purchase. Not compatible with Bravo 2, 3, XR, or TR units.

Why Choose Endxedo?

We focus on providing high-quality, durable marine tools that meet or exceed OEM specifications. Our products are engineered for the harsh conditions of the sea, offering professional performance at an affordable price point.