4-inch Black Rubber Spool Roller with 5/8" Bore – Fits Boat Trailers (Replaces Yates 23739)
4-inch Black Rubber Spool Roller with 5/8" Bore – Fits Boat Trailers (Replaces Yates 23739) is backordered and will ship as soon as it is back in stock.
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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.
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4-inch Black Rubber Spool Roller with 5/8" Bore – Fits Boat Tr...
4-inch Black Rubber Spool Roller with 5/8" Bore – Fits Boat Trailers (Replaces Yates 23739) is backordered and will ship as soon as it is back in stock.
Product Details
This heavy-duty 4-inch black rubber spool roller is designed for boat trailers, featuring a 5/8-inch bore for standard roller shafts. Its spool design helps guide the boat during loading and unloading, providing smooth and controlled movement while preventing hull drift.
It serves as a direct aftermarket replacement for Yates 23739, Valmar 80782, and Craton SK344 rollers.
- Mounts on a 5/8" diameter roller shaft.
- Constructed from durable black rubber for longevity.
- Spool shape helps center the boat on the trailer.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket brands.
| Brand | Part Number |
|---|---|
| Yates | 23739 |
| Valmar | 80782 |
| Craton | SK344 |
Technical Specs
- Product Type
- Boat Trailer Spool Roller
- Installation
- Mounts on 5/8" diameter roller shaft
- Housing Material
- Black Rubber
- Dimensions
- 4" width x 2-7/8" diameter with 5/8" bore
- Color
- Black
- Mounting Hole
- 5/8 inch (0.625")
- Overall Length
- 4 inches
- Compatibility
- Works with most boat trailer frames and crossmembers when used with proper mounting hardware
- Installation Hardware
- Requires 5/8" diameter roller shaft and pal nuts (sold separately)
What’s in the Box
- 1 x 4-inch Black Rubber Spool Roller (23739)
Installation Notes
This spool roller is typically mounted on a 5/8" diameter roller shaft (a 5-1/4" long shaft is common for a 4" roller) that fits into a 4" roller bracket. The roller and shaft are secured using 5/8" pal nuts, which are hammered onto each end of the shaft. This entire bracket assembly then attaches to the trailer's crossmember with U-bolts or other appropriate mounting hardware.
Troubleshooting & FAQ
How do I know if this roller will fit my trailer?
Verify the dimensions of your current roller and the diameter of its shaft. This roller has a 4-inch width and fits a 5/8-inch diameter shaft. If your measurements match, it should fit.
What other parts are needed for installation?
To install this roller, you will need a 5/8" diameter roller shaft and corresponding 5/8" pal nuts to secure it. The bracket that holds the shaft will require U-bolts or other hardware to attach to the trailer frame.
When should I replace my trailer rollers?
Inspect your rollers regularly. You should replace them if you see signs of significant wear, deep cracks, flat spots, or if they no longer spin freely. Worn-out rollers can damage your boat's hull.
Will this black rubber roller mark my boat hull?
Black rubber rollers are very durable but can sometimes leave scuff marks on light-colored gelcoat or aluminum hulls. If this is a primary concern, consider non-marking polyurethane rollers as an alternative.
What is the load capacity of this roller?
A specific load rating for this roller is not available. However, it features a heavy-duty rubber construction designed to handle a wide range of boats commonly transported on trailers.
What is the difference between a spool roller and a keel roller?
Spool rollers, like this one, have raised edges that act as self-centering guides to keep the boat aligned on the trailer. Keel rollers are generally smoother and v-shaped or flat to support the boat's keel directly.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns
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 (unused & in 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.
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