Description
SIERRA 1-1/16 Inch Rustproof Polymer Propeller Wrench – 18-4459
Sierra 18-4459 is a propeller nut wrench for Most compatible sterndrive and larger outboard propeller nuts using a 1-1/16-inch hex, including listed Mercury/MerCruiser applications.
- Rustproof polymer construction is suited to onboard propeller service without corroding like an unprotected steel wrench.
- 1-1/16-inch wrench size fits the common propeller nut used on many four-cylinder-and-larger outboards and sterndrives.
- Cross-references Mercury/MerCruiser 91-821887A1, 91-821887T1 and 91-859046-series prop-wrench references.
- Designed as a direct marine-service replacement where the listed Sierra/OEM reference is specified.
- Compare the original part number, dimensions and assembly configuration before installation.
Fitment for marine engine and drive service parts can vary by model, serial number, drive/gearcase, cooling configuration and prior OEM supersessions. Compare the original OEM number and physical configuration before installation, and follow the applicable manufacturer service procedure and torque specifications.
Specifications
- Manufacturer: Sierra
- Part Number: 18-4459
- Part Type: Propeller nut wrench
- Application: Most compatible sterndrive and larger outboard propeller nuts using a 1-1/16-inch hex, including listed Mercury/MerCruiser applications.
- Wrench Size: 1-1/16 in
- Material: Rustproof polymer
Interchange / OEM References
- Mercury/MerCruiser: 91-821887A1, 91-821887T1, 91-859046M4, 91-859046Q4, 91-859046T4

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