Sierra 18-3717 Prop Nut Kit, Replaces OMC 175268, for Johnson/Evinrude Outboard Motors

The Sierra 18-3717 Prop Nut Kit is a complete propeller hardware set for Johnson/Evinrude (OMC/BRP) outboard drive systems. It supplies the three components needed to properly secure a propeller to the prop shaft: a prop nut, a cotter pin, and a prop spacer. Each part in the kit meets or exceeds original equipment quality, so it installs and functions like the factory hardware it replaces.

The kit directly replaces OMC part number 175268, and each individual component cross-references to its own OMC part number, making it straightforward to confirm fitment against your outboard's existing hardware. The prop nut and spacer are metal with a machined finish, built to handle the repeated torque and vibration loads of propeller hardware. The cotter pin locks the prop nut in place to keep the propeller from backing off the shaft during operation.

This kit is intended for boat owners and technicians replacing worn, corroded, or lost propeller hardware, or servicing a propeller during routine maintenance. Because it bundles all three parts together, it saves the step of sourcing the nut, pin, and spacer separately.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-3717
• Product Name: Prop Nut Kit
• Kit Contents: Prop Nut (18-3707, O.E. 319891), Cotter Pin (18-3743, O.E. 320785), Prop Spacer (18-4232, O.E. 323943)
• Material: Metal
• Finish: Machined
• Weight: 0.15 pounds
• UPC: 030999316387

Fitment

• Outboard - Johnson/Evinrude (OMC/BRP) drive systems

Replaces (OEM)

• OMC 175268

Frequently Asked Questions

What does the Sierra 18-3717 Prop Nut Kit include? The kit contains a prop nut, a cotter pin, and a prop spacer, the three components needed to mount and secure a propeller on a Johnson/Evinrude outboard prop shaft.

What OEM part number does the 18-3717 kit replace? It replaces OMC part number 175268. Sierra part 18-3717 is the direct aftermarket equivalent.

What is the individual prop nut's part number? The prop nut included in kit 18-3717 is Sierra part 18-3707, which corresponds to OMC/O.E. Number 319891.

What is the cotter pin's part number in this kit? The cotter pin is Sierra part 18-3743, corresponding to OMC/O.E. Number 320785.

What is the prop spacer's part number in this kit? The prop spacer is Sierra part 18-4232, corresponding to OMC/O.E. Number 323943.

What is the 18-3717 prop nut kit made of? The prop nut and spacer are metal with a machined finish, designed to withstand the torque and vibration loads a propeller places on the prop shaft.

Is the Sierra 18-3717 kit genuine OEM or aftermarket? It is a Sierra aftermarket kit manufactured to meet or exceed original equipment quality, sold as a direct replacement for OMC 175268.

How much does the 18-3717 Prop Nut Kit weigh? The complete kit weighs 0.15 pounds.

What outboards is the 18-3717 Prop Nut Kit designed for? It is designed for the Johnson/Evinrude (OMC/BRP) outboard drive system.

Do I need a cotter pin to install a propeller, and does this kit include one? Yes, a cotter pin is required to lock the prop nut in place so it cannot back off the shaft, and the Sierra 18-3717 kit includes one along with the nut and spacer.