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Prop Nut - Sierra Marine Engine Parts - 18-3709 (118-3709)

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0.06 LBS
Unit of Measure:
Manufacturer Part Number (MPN):

Prop Nut - Sierra Marine Engine Parts - 18-3709 (118-3709)


For more than a decade, the company has worked hard to build partnerships with manufacturers to provide our customers with high-quality things at reasonable costs. They do not offer remanufactured, reconditioned, or used parts and only sell new, top-of-the-line, brand-name products. Sierra Marine’s Prop Nut (18-3709) has the highest quality, safety, and performance requirements. The Sierra Marine’s Prop Nut (18-3709) ensures that your propeller is securely attached to the shaft taper. Sierra Marine’s Prop Nut (18-3709) is rust and corrosion-resistant as well a long service life. Sierra's 18-3709 Yamaha Prop Nut is a replacement prop nut for Yamaha boat motors specifically to replace Yamaha part number 647-45616-02.

Key Features:

  • Will deliver the highest level of dependability.
  • Made with the highest quality materials available.
  • Resistance against rust and corrosion.
  • Sturdy and long-lasting.
  • Excellent Quality as a result of stringent quality control.


  • SKU: 18-3709
  • UPC: 808282312114
  • Weight: 0.25 LBS
  • Manufacturer Part Number (MPN): 18-3709

Fits Yamaha 4 (1984-91), 5(1984-85)

This product replaces:

    647-45616-02, 47-3709, 808282312114


We can ship to virtually any address in the US. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.

When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.

Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.

Returns Policy

You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.)

You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).

If you need to return an item, please Contact Us with your order number and details about the product you would like to return. We will respond quickly with instructions for how to return items from your order.

Need help? We're available at+1 (800) 664-8116 - Email us
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