4-inch Boat Trailer Spool Roller – Fits 1/2-inch or 5/8-inch Shaft
4-inch Boat Trailer Spool Roller – Fits 1/2-inch or 5/8-inch Shaft is backordered and will ship as soon as it is back in stock.
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Worry-free returns
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Delivery and Shipping
Delivery and Shipping
Orders are typically processed within 1–2 business days.
U.S. orders usually arrive within 6–15 days, depending on stock location and destination.
International delivery times may vary due to customs processing.
Tracking information will be provided once your order ships.
4-inch Boat Trailer Spool Roller – Fits 1/2-inch or 5/8-inch Shaft
4-inch Boat Trailer Spool Roller – Fits 1/2-inch or 5/8-inch Shaft is backordered and will ship as soon as it is back in stock.
Product Details
This heavy-duty 4-inch Boat Trailer Spool Roller is designed for boat trailer applications, providing smooth and stable support for your boat without scratching or causing damage. The spool design allows for easy loading and unloading of various boat hull types.
Manufactured in the USA by C.H. Yates Rubber, this is a direct aftermarket replacement for corresponding spool rollers.
- Made from heavy-duty black rubber to prevent scratching your boat's hull.
- Installs on a standard roller shaft within a 4-inch roller bracket.
- Available in 1/2-inch or 5/8-inch inner diameter variants to fit your shaft size.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Notes |
|---|---|---|
| C.H. Yates Rubber | 23738 | For 1/2-inch Bore |
| C.H. Yates Rubber | 23739 | For 5/8-inch Bore |
Technical Specs
- Product Type
- Boat Trailer Spool Roller
- Material
- Heavy-duty black rubber
- Inner Diameter Options
- 1/2-inch or 5/8-inch
- Overall Length
- 4 inches (101.6 mm)
- Outside Diameter
- 3.5 inches (88.9 mm)
- Installation
- Mounts on roller shaft in roller bracket
- Color
- Black
- Design
- Spool configuration with reinforced ends
- Manufacturer
- C.H. Yates Rubber
- Country of Origin
- USA
What’s in the Box
- 1 x Boat Trailer Spool Roller (Yates 23738 for 1/2-inch bore or Yates 23739 for 5/8-inch bore)
Installation Notes
This roller mounts on a roller shaft of either 1/2-inch or 5/8-inch diameter, corresponding to the roller variant you purchase. The assembly is secured inside a 4-inch roller bracket, with the shaft typically held in place by Pal Nuts hammered onto each end.
Recommended hardware (not included):
- Roller Shaft (5.5" to 6.25" long with a diameter matching your roller's bore)
- Pal Nuts (matching the shaft's diameter)
- 4-inch Galvanized Roller Bracket
Troubleshooting & FAQ
What is the difference between the 1/2" and 5/8" versions?
The only difference is the inner diameter (bore) of the hole running through the center. Choose the model that matches the diameter of your trailer's roller shaft.
Will this black rubber mark my boat's hull?
This roller is made from non-marking, heavy-duty rubber designed specifically to protect your boat's gelcoat and finish during loading and transport.
How do I know when to replace my rollers?
Inspect your rollers regularly for signs of cracking, splitting, or excessive wear. A worn-out roller can become flat, losing its shape and failing to spin freely, which can damage your hull. Replace any roller that shows visible signs of degradation.
Is a load capacity rating available?
While a specific load rating from the manufacturer is not provided, these rollers are designed for use on a wide range of standard recreational boat trailers. Load is distributed across multiple rollers; ensure your trailer's overall setup meets your boat's weight requirements.
What tools are needed for installation?
Typically, you will need a hammer to install the Pal Nuts on the end of the shaft and wrenches to adjust the roller bracket on the trailer's crossmember.
Can I use this for a keel roller?
This is a spool-style roller, designed to guide the sides of the hull. While it could be used on a keel in some custom setups, dedicated keel rollers are generally recommended for supporting the boat's keel.
Is this an OEM part?
This listing is an aftermarket replacement (not OEM). It is built to OEM-level specifications with comparable materials. It is manufactured in an ISO 9002 facility and batch-inspected for consistency.
What are the shipping speed & cost?
We ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
What is the warranty & return policy?
This product is covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window for items that are unused and in their original condition. See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
Payment & Security
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