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4-inch Black Rubber Spool Roller with 5/8" Bore – Fits Boat Trailers (Replaces Yates 23739)
- $15.59
- $15.59
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4-inch Black Rubber Spool Roller with 5/8" Bore – Fits Boat Trailers (Replaces Yates 23739)
This 4-inch black rubber spool roller features a 5/8-inch inner diameter bore and is designed for a wide variety of boat trailers. The spool design helps guide the boat's keel, providing smoother loading and unloading operations.
This part is a direct replacement for: Yates 23739, Valmar 80782, and Craton SK344.
- Material: Heavy-duty black rubber for durability.
- Design: Spool shape for self-centering boat alignment.
- Installation: Mounts on a standard 5/8" diameter roller shaft.
Technical Specifications
| Specification | Value |
|---|---|
| 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) |
Recommended Assembly Components
| Component | Description | Notes |
|---|---|---|
| Roller Shaft | Zinc Plated Roller Shaft 5 1/4" long, 5/8" Diameter | For mounting 4" roller into 4" roller bracket |
| Mounting Bracket | 4" Galvanized Roller Bracket | Bolts to trailer crossmembers |
| Fasteners | 5/8 inch Zinc Plated Boat Trailer Roller Shaft Pal Nuts | Hammered onto shaft ends to secure roller |
| Mounting Hardware | Boat Trailer U-Bolts | For attaching roller bracket to trailer crossmember |
Package Contents
Please Note: This listing is for the roller only. Mounting hardware is sold separately.
- 1 x 4-inch Black Rubber Spool Roller (23739)
Installation Guide
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), which fits into a 4" galvanized roller bracket. The roller and shaft are secured together using 5/8" pal nuts hammered onto each end of the shaft. The entire roller bracket assembly then attaches to the trailer's crossmember using U-bolts or other appropriate mounting hardware. The heavy-duty rubber construction and spool design allow for easy loading and unloading of various boat hull types.
Troubleshooting & FAQ
How do I know if this roller will fit my trailer?
This roller is designed for a 4" wide mounting bracket and a 5/8" diameter roller shaft. Measure your existing bracket and shaft to ensure compatibility. It works with most boat trailer frames when used with the correct hardware.
What else do I need to install this roller?
You will need a 5/8" diameter roller shaft (typically 5-1/4" long for a 4" roller), a 4" roller bracket, and 5/8" pal nuts to secure the roller onto the shaft. These are usually sold separately.
What is the difference between a spool roller and a straight roller?
The spool (or "self-centering") design helps guide the boat's keel during loading and unloading, making it easier to center the boat on the trailer. Straight rollers provide a flat support surface without the guiding edges.
OEM vs. Aftermarket?
This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.
How fast do you ship and how much does it cost?
We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.
What is your warranty and return policy?
This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.
Important Notes
- Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
- This product is an aftermarket replacement part and is not an OEM component.
- Professional installation is recommended to ensure safety and optimal performance.
Why Choose JLM MARINE?
- Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
- Fast Global Shipping: Free delivery worldwide in 5–15 days.
- Direct from Manufacturer: Competitive pricing without compromising quality.
We can ship to virtually any address in the world with free shipping available for most regions.
For our typical US and Canadian customers , our shipping timeframes are as follows:
- Amazon FBA: orders will be delivered within 1-5 business days after placing the order (during certain special periods such as major promotions, Christmas, etc., the delivery time of Amazon FBA may be affected).
- US warehouse shipment: orders will be delivered within 5 days after placing the order.
- China warehouse shipment: orders will be delivered about 12 days after placing the order.
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.
Founded in 2002, JLM Marine has established itself as a dedicated manufacturer of high-quality marine parts, based in China. Our commitment to excellence in manufacturing has earned us the trust of top marine brands globally.
As a direct supplier, we bypass intermediaries, which allows us to offer competitive prices without compromising on quality. This approach not only supports cost-efficiency but also ensures that our customers receive the best value directly from the source.
We are excited to expand our reach through retail channels, bringing our expertise and commitment to quality directly to boat owners and enthusiasts worldwide.
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