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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Delivery and Shipping
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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 is designed for boat trailers that use a compatible 1/2-inch mounting shaft. Its durable, non-marking polyurethane construction provides resilient bow support during loading, launching, and trailering while helping reduce hull scuffs and scratches.
This is a single aftermarket roller assembly. The mounting shaft and installation hardware are not included, so confirm the dimensions of your existing bow-stop hardware before ordering.
- Installation Method: Bolt-on installation using a compatible 1/2-inch mounting shaft; shaft and hardware are not included.
- Material Benefits: Polyurethane construction is resistant to sunlight, water, and common marine-use conditions.
- Surface: Smooth, non-marking surface helps protect the boat hull from black marks and abrasion.
- Application: Suitable for compatible boat-trailer bow-stop assemblies across multiple trailer brands.
Part Number Matrix
Use the product dimensions and mounting-shaft size to compare this replacement with your existing trailer roller. No verified OEM or manufacturer part-number cross-reference is provided for this product.
| Reference | Verification Guidance |
|---|---|
| Boat trailer bow roller | Compare the existing roller dimensions and confirm a compatible 1/2-inch mounting shaft. |
| 7" x 4" roller assembly | The listed roller dimensions are approximately 7 inches by 4 inches. |
Trailer Compatibility
Compatibility depends on the trailer bow-stop bracket, mounting shaft, and available clearance. This roller is intended for compatible boat trailers using a 1/2-inch mounting shaft; it is not an engine-specific part.
| Application | Requirement | Notes |
|---|---|---|
| Boat trailer bow stop | Compatible 1/2-inch mounting shaft | Measure the existing roller, shaft, brackets, and clearance before installation. |
Technical Specs
- Product Type
- Boat trailer bow roller assembly
- Installation
- Bolt-on using a compatible 1/2-inch mounting shaft
- Material
- Polyurethane (PU)
- Color
- Black
- Dimensions
- Approximately 7 inches long x 4 inches wide (177.8 mm x 101.6 mm)
- Mounting Shaft Size
- 1/2 inch (12.7 mm); shaft not included
- Weight
- Approximately 0.94 kg (2.07 lb)
- Surface
- Smooth, non-marking polyurethane surface
What's in the Box
- 1 x Black boat trailer bow roller assembly
Not included: Mounting shaft, bolts, washers, nuts, and other installation hardware.
Installation Notes
- Place the trailer on a level, stable surface and ensure the boat is secured or removed.
- Inspect the existing bow-stop bracket, shaft, and hardware for wear, corrosion, or damage.
- Remove the retaining hardware and slide the old roller off the mounting shaft.
- Clean the brackets and shaft, then verify that the shaft is compatible with the new roller assembly.
- Position the new roller between the brackets and slide the compatible 1/2-inch shaft through the assembly.
- Reinstall the retaining hardware and tighten it securely without restricting the roller's ability to rotate freely.
- Check alignment and roller movement before loading or trailering the boat.
Troubleshooting & FAQ
How do I know if this roller will fit my trailer?
Measure your existing roller and confirm that the available space is approximately 7 inches by 4 inches and that your bow-stop assembly uses a compatible 1/2-inch mounting shaft. Also check the bracket width, shaft length, retaining hardware, and clearance. Do not rely on trailer brand alone to confirm fitment.
Is the mounting shaft or hardware included?
No. This package contains one black polyurethane roller assembly only. The mounting shaft, bolts, washers, nuts, and other hardware are not included.
What are the benefits of polyurethane?
Polyurethane provides a durable, smooth, non-marking contact surface that helps support the bow while reducing the risk of black marks and surface abrasion associated with some rubber rollers.
When should I replace my bow roller?
Replace the roller if it shows cracking, splitting, flat spots, deep gouges, deformation, excessive wear, or restricted rotation. Inspect the shaft and brackets at the same time and replace damaged hardware as needed.
What are the signs of a failing bow roller?
Common signs include visible cracks, deep grooves, a flattened or lopsided profile, unusual resistance while rotating, or the roller no longer supporting the boat evenly during loading.
Can this roller be used in freshwater and saltwater environments?
The polyurethane roller is intended for marine trailer use and is resistant to water and common marine-use conditions. Rinse the roller and mounting hardware with fresh water after saltwater exposure and inspect regularly for wear or corrosion.
Is this an OEM part?
This listing is for an aftermarket replacement roller assembly. Confirm the dimensions and mounting requirements against your existing trailer before installation.
What should I check before installation?
Confirm the roller dimensions, mounting-shaft diameter, bracket spacing, shaft length, retaining hardware, and available clearance. Stop installation if any component is damaged or if the assembly does not align correctly.
Safety & Important Info
- Support and secure the boat and trailer before removing the existing roller.
- Verify dimensions and mounting requirements before purchase and installation.
- Do not use a damaged shaft, bracket, nut, bolt, or retaining component.
- After installation, confirm that the roller is aligned, securely retained, and able to rotate freely.
- Professional installation is recommended if the trailer hardware is worn, corroded, or difficult to identify.
About Sea Sierra
- Pro-Grade Standards — We supply marine replacement parts selected for dependable performance in real-world conditions.
- Fast Global Fulfillment — Standard delivery options are available to most regions; estimated delivery timing is shown at checkout.
- Manufacturer-Direct Value — Practical replacement parts at competitive prices.
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