7" X 4" Boat Trailer Roller Assembly with 1/2 Inch Shaft Bow Stop

7" X 4" Boat Trailer Roller Assembly with 1/2 Inch Shaft Bow Stop – Fits Multiple Trailer Brands

This is a versatile bow roller assembly for boat trailers equipped with a 1/2 inch mounting shaft. It is crafted from a durable, non-marking polyurethane material that provides gentle yet firm support for your boat's bow during loading and trailering. Its construction ensures resistance to sunlight, chemicals, and water, offering a long service life.

This assembly serves as a direct replacement for GlückMarine 7" X 4", MARKGOO 7" X 4", and JFATXTT 4" bow rollers, providing a reliable alternative for maintaining your trailer.

• Installation Method: Simple bolt-on process using a 1/2 inch shaft.
• Material: High-grade Polyurethane (PU).
• Fitment: Universal design for most boat trailers; please verify dimensions before ordering.

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across compatible aftermarket brands.

Compatibility Information

Confirm your trailer's specifications in the table below.

Technical Specifications

Package Contents

• 1 x Boat Keel Roller (7" x 4" with 1/2" shaft hole)

Installation Guide

Follow these steps for a secure installation:

1. Ensure the boat is securely positioned off the trailer and the trailer is parked on a level surface. Chock the trailer wheels for safety.
2. Identify the bow stop winch stand and locate the existing roller that needs replacement.
3. Use appropriate wrenches to loosen and remove the nut from the bolt or shaft holding the old roller in place.
4. Slide the shaft out of the mounting bracket and remove the old, worn-out roller.
5. Clean the shaft and the inside surfaces of the mounting bracket to remove any rust or debris.
6. Align the new polyurethane roller with the mounting holes on the bracket.
7. Slide the 1/2 inch shaft through the bracket and the center hole of the new roller.
8. Re-install the washer and nut on the end of the shaft, tightening it securely.
9. Ensure the roller can still spin freely with minimal resistance. Do not overtighten.
10. Check the final alignment to ensure it will properly guide the boat's bow when loading.

Troubleshooting & FAQ

Q: How do I confirm this roller will fit my specific boat trailer?
A: This is a universal roller designed for a 1/2 inch shaft. Measure your trailer's existing roller shaft diameter and an available width of at least 4 inches on your bow stop bracket. The roller's total length is 7 inches.

Q: What is the advantage of a polyurethane (PU) roller over a traditional rubber one?
A: Polyurethane is a superior material for this application as it is highly resistant to damage from sunlight, oil, and marine growth. It is also non-marking, meaning it will not leave scuffs or scratches on your boat's hull, unlike some rubber rollers.

Q: Will this roller crack or degrade over time?
A: The PU construction is designed for longevity and is much more durable than standard rubber. It resists cuts, abrasions, and the harsh marine environment, preventing the cracking and splitting common with older materials.

Q: OEM vs. Aftermarket?
A: 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.

Q: How fast do you ship and how much does it cost?
A: 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.

Q: What is your warranty and return policy?
A: 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.