Sierra 18-4459 Marine Prop Wrench for 1 1/16 Inch Propeller Nut

The Sierra 18-4459 Marine Prop Wrench is a purpose-built hand tool sized to fit a 1 1/16 inch propeller nut, the size found on most sterndrives and on 4-cylinder and larger outboard motors. Instead of relying on an adjustable wrench or pliers that can slip and round off the nut's flats, this wrench is machined to the correct nut dimension for a secure, controlled grip during propeller removal and installation. That precision fit reduces the risk of damaging the nut or the prop shaft while servicing the lower unit.

Built for regular use around salt and fresh water, the wrench is a straightforward addition to any boat owner's or marine technician's toolbox, making routine propeller swaps, inspections, and hub replacements easier to perform correctly the first time.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-4459
• Category: Mercury Prop Hardware
• Nut Size Compatibility: 1 1/16 inch
• Application: Most sterndrives and 4-cylinder and larger outboards
• Finish: Machined
• Weight: 0.56 pounds
• UPC: 030999875815

Fitment

• Fits a 1 1/16 inch propeller nut
• Fits most sterndrives
• Fits 4-cylinder and larger outboard motors

Frequently Asked Questions

What nut size does the Sierra 18-4459 prop wrench fit? The Sierra 18-4459 is sized for a 1 1/16 inch propeller nut.

What boats and engines is this prop wrench compatible with? It fits most sterndrives as well as 4-cylinder and larger outboard motors that use a 1 1/16 inch propeller nut.

How much does the Sierra 18-4459 prop wrench weigh? This wrench weighs 0.56 pounds.

Can I use an adjustable wrench instead of this tool? An adjustable wrench can slip or round off the flats on a 1 1/16 inch propeller nut; the Sierra 18-4459 is machined to that exact size for a more secure grip during removal and installation.

What is this tool used for? The Sierra 18-4459 prop wrench is used to loosen and tighten the propeller nut when removing or installing a boat propeller.

What finish does the Sierra 18-4459 have? It has a machined finish.

Is this wrench made by Sierra or a third party? The 18-4459 prop wrench is a genuine Sierra part, identified by Sierra part number 18-4459.

Will this fit a 4-cylinder outboard? Yes, the Sierra 18-4459 is listed as fitting 4-cylinder and larger outboard motors with a 1 1/16 inch propeller nut.

Does this wrench work on sterndrive propellers? Yes, the 18-4459 is compatible with most sterndrive applications using a 1 1/16 inch propeller nut.

What comes in the box with the Sierra 18-4459? The Sierra 18-4459 is a single prop wrench tool.