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 is backordered and will ship as soon as it is back in stock.
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7" x 4" Boat Trailer Roller Assembly with 1/2-Inch Shaft ...
7" x 4" Boat Trailer Roller Assembly with 1/2-Inch Shaft Bow Stop is backordered and will ship as soon as it is back in stock.
Product Details
This 7" x 4" boat trailer roller assembly with a 1/2-inch shaft bow stop provides resilient, non-marking support for your boat's bow during loading and trailering. It is designed for boat trailers equipped with a compatible 1/2-inch mounting shaft and bow-stop bracket.
The polyurethane roller helps guide the boat into position while reducing contact marks on the hull. Confirm the roller dimensions, shaft diameter, and mounting arrangement against your existing assembly before ordering.
- Complete bow roller assembly for replacement applications.
- Designed for bolt-on installation with a compatible 1/2-inch shaft.
- Polyurethane construction provides a durable, non-marking contact surface.
- Suitable for many boat-trailer configurations when the dimensions and mounting hardware match.
Fitment & Reference Information
This is a trailer component rather than an engine-specific part. Fitment depends on the dimensions of the existing bow-stop assembly, shaft, and mounting hardware.
| Check | Required condition |
|---|---|
| Application | Boat-trailer bow stop or bow roller assembly |
| Mounting shaft | Compatible 1/2-inch shaft |
| Roller size | 7 inches long x 4 inches wide |
| Compatibility | Verify the existing bracket, shaft, dimensions, and hardware before purchase |
Technical Specs
- Product Type
- Boat trailer bow roller assembly
- Installation
- Bolt-on installation with a compatible 1/2-inch shaft
- Material
- Polyurethane (PU)
- Dimensions
- 7 inches long x 4 inches wide (177.8 mm x 101.6 mm)
- Center Hole Diameter
- 17 mm (0.67 inch)
- Shaft Size
- 1/2 inch (12.7 mm)
- Weight
- 0.94 kg (2.07 lb)
- Fitting Type
- Bow stop roller
- Surface
- Non-marking polyurethane contact surface
What's in the Box
- 1 x 7" x 4" boat trailer bow roller assembly
Mounting bolts, nuts, washers, and other trailer hardware are not listed as included unless supplied with the original mounting assembly. Reuse existing hardware only if it is compatible and in good condition.
Installation Notes
- Secure the boat and trailer on a level surface before beginning work.
- Support the boat safely and remove the hardware securing the old bow roller assembly.
- Slide the old roller off the shaft and retain compatible washers or other hardware that remains in good condition.
- Clean the mounting bracket and shaft to remove debris, corrosion, and buildup.
- Compare the new roller with the old assembly, checking its width, center hole, and mounting position.
- Slide the new polyurethane roller onto the compatible 1/2-inch shaft.
- Reinstall the assembly into the bow-stop bracket and tighten the hardware securely.
- Confirm that the roller rotates freely, remains firmly retained, and aligns correctly with the boat's bow before use.
Troubleshooting & FAQ
How do I confirm this roller will fit my trailer?
Measure the existing roller, center hole, shaft, and mounting bracket. The listed roller dimensions are 7 inches x 4 inches, and the shaft specification is 1/2 inch. All dimensions and the mounting arrangement must match your trailer.
What is the advantage of a polyurethane roller?
Polyurethane provides a durable, resilient contact surface that is designed not to mark the boat hull under normal use. Proper alignment and secure installation are also important for preventing damage.
The center hole is 17 mm, but the shaft size is 1/2 inch. Is this normal?
The listed center-hole measurement is larger than the nominal shaft diameter, allowing the roller to rotate on a compatible shaft. Check the actual shaft, washers, spacers, and retaining hardware on your trailer before installation.
When should I replace my bow roller?
Inspect the roller regularly for cracks, flat spots, cuts, excessive wear, or material deterioration. Replace it if it no longer rotates properly or does not provide stable, even support for the boat's bow.
Is this an OEM part?
This listing is for an aftermarket replacement bow roller assembly. It is not identified as an OEM component.
Does the assembly include mounting hardware?
The package includes one boat-trailer bow roller assembly. Mounting hardware is not listed as included, so compare the original hardware and obtain compatible replacement hardware if necessary.
How should I maintain the roller?
Keep the roller and shaft clean, inspect the contact surface and hardware periodically, and confirm that the roller turns freely. Replace worn or damaged hardware before towing or launching the boat.
Safety & Important Information
- Verify the dimensions, shaft diameter, bracket, and mounting arrangement against your original assembly before purchase.
- Do not tow or launch the boat if the roller is cracked, loose, misaligned, or unable to rotate freely.
- Use compatible retaining hardware and tighten it securely without restricting roller movement.
- Professional installation is recommended when the trailer or boat cannot be safely supported during service.
About Sea Sierra
- Marine Replacement Parts — We supply replacement components for practical boat and trailer maintenance.
- Fitment-Focused Information — Compare dimensions and mounting details with your existing part before ordering.
- Customer Support — Contact support if you need help comparing this roller with your current trailer assembly.
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