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

This heavy-duty black rubber 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. It is engineered to fit either a 1/2-inch or 5/8-inch diameter roller shaft, ensuring a proper fit for your specific trailer setup.

• Material: Heavy-duty black rubber
• Shaft Compatibility: Available for 1/2" or 5/8" shafts
• Origin: Proudly made in the USA by C.H. Yates Rubber

Part Number Cross-Reference

Use this table to confirm the manufacturer part number for your required size.

Technical Specifications

Package Contents

• 1 x Boat Trailer Spool Roller (select your required bore size: Yates 23738 for 1/2-inch or Yates 23739 for 5/8-inch)

Installation Guide

1. Select the roller with the correct inner diameter (1/2-inch or 5/8-inch) to match your trailer's roller shaft.
2. Obtain the necessary mounting hardware: a roller shaft (typically 5.5" to 6.25" long), Pal Nuts matching the shaft diameter, and a compatible 4-inch roller bracket.
3. Bolt the 4-inch roller bracket securely to the crossmembers of your boat trailer frame.
4. Slide the roller shaft through the roller bracket and the center of the spool roller.
5. To secure the assembly, hammer the Pal Nuts onto each end of the shaft until they are firmly seated against the bracket.

Troubleshooting & FAQ

How do I choose the right size roller?

Measure the diameter of your existing roller shaft. This roller is available in two variants to fit either a 1/2-inch or 5/8-inch shaft. Ensure you select the correct size from the product options before purchasing.

What hardware do I need for installation?

Installation requires a roller shaft, Pal Nuts, and a roller bracket, which are not included. We recommend a 5.5"-6.25" long shaft (with a diameter matching your roller's inner bore) and a 4-inch roller bracket for proper mounting.

Will this roller mark my boat's hull?

No, this roller is made from heavy-duty black rubber specifically designed to provide smooth, non-marking support for your boat's hull during loading and unloading.

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.