Bow Roller Assembly – Fits Boat Trailers 1/2" Shaft (Replaces JFATXTT, MARKGOO, GlückMarine)
Bow Roller Assembly – Fits Boat Trailers 1/2" Shaft (Replaces JFATXTT, MARKGOO, GlückMarine) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
Orders are typically processed within 1–2 business days.
U.S. orders usually arrive within 6–15 days, depending on stock location and destination.
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Bow Roller Assembly – Fits Boat Trailers 1/2" Shaft (Replaces ...
Bow Roller Assembly – Fits Boat Trailers 1/2" Shaft (Replaces JFATXTT, MARKGOO, GlückMarine) is backordered and will ship as soon as it is back in stock.
Product Details
This is a durable Polyurethane Boat Trailer Bow Roller Assembly designed to fit various boat trailers. The non-marking polyurethane construction protects your boat's hull from scuffs and scratches while providing smooth, reliable support during loading and trailering. It mounts on standard winch posts that accommodate a 1/2" diameter shaft.
This assembly is a direct interchange for several models, including the JFATXTT 3" and 4" Bow Rollers, MARKGOO 7x4 INCH Bow Stop, and GlückMarine 5"x3" Bow Roller Assembly.
- Mounts directly on your trailer’s winch post using a 1/2" shaft/bolt.
- Made from non-marking polyurethane that will not rust or develop flat spots.
- Includes the roller, two end bells, and all necessary mounting hardware.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Notes |
|---|---|---|
| JFATXTT | 3" Bow Roller | Direct replacement |
| JFATXTT | 4" Bow Roller | Direct replacement |
| MARKGOO | 7x4 INCH Bow Stop | Equivalent assembly |
| GlückMarine | 5"x3" Bow Roller Assembly | Equivalent assembly |
Engine & Model Compatibility
Confirm your trailer's winch post dimensions in the table below.
| Brand | Model | Type | Specifications | Notes |
|---|---|---|---|---|
| General | Boat Trailers | Winch posts | 1/2" shaft diameter | For standard bow mounts |
| General | Ski Boats | Trailers | 1/2" shaft diameter | Fits standard bow mounts |
| General | Fishing Boats | Trailers | 1/2" shaft diameter | Fits standard bow mounts |
| General | Sailboat Trailers | Trailers | 1/2" shaft diameter | Fits standard bow mounts |
Technical Specs
- Product Type
- Boat Trailer Bow Roller Assembly
- Installation
- Mounts on boat trailer winch post
- Connection
- 1/2" diameter shaft/bolt
- Housing Material
- Polyurethane/Polyvinyl
- Housing Color
- Blue/Red (varies by selection)
- Dimensions
- Inner length: 3" (76.2 mm), Outer length: 5" (127 mm)
- Weight
- Approx. 0.58 kg (1.28 lbs)
- Fitting Type
- Mounts in winch posts with included hardware
- Thread Size
- 1/2" shaft
- Other Technical Attributes
- Non-marking, won't rust or flat spot
What’s in the Box
- 1 x Polyurethane Bow Roller (3" inner length, 5" outer length)
- 2 x End Bells/Caps
- 1 x 1/2" Diameter Mounting Bolt with Hardware
Installation Notes
- Ensure the boat is securely positioned off the trailer's bow stop to relieve pressure.
- Use a wrench to loosen and remove the nut from the existing bow roller bolt.
- Slide the old bolt out of the winch post bracket to release the old roller. Note the order of hardware.
- Clean the bracket area of any dirt or debris before installation.
- Position the new roller between the winch post brackets.
- Slide the new 1/2" mounting bolt through the bracket, one end bell, the roller, the second end bell, and the other side of the bracket.
- Securely fasten the nut onto the bolt.
- Do not overtighten—the roller must spin freely with minimal resistance. Check for smooth rotation.
Troubleshooting & FAQ
How do I know if this roller will fit my trailer?
This roller fits winch post brackets designed for a 3-inch wide roller and uses a 1/2-inch diameter shaft or bolt. The total assembly width with end caps is 5 inches. Measure your existing setup to confirm compatibility.
What's the difference between the 3" and 5" measurement?
The 3-inch dimension refers to the inner length of the roller itself, which is the part that fits between the two winch post brackets. The 5-inch dimension is the total outer length, including the two end bells/caps on each side.
Will this polyurethane roller mark my boat's hull?
No. It is made from a non-marking polyurethane/polyvinyl material specifically designed to protect your boat's finish from scuffs and marks during loading and transport.
How tight should I fasten the mounting bolt?
Tighten the nut securely, but do not overtighten. The roller must be able to spin freely with minimal resistance. If it's too tight, it won't rotate as the boat moves, defeating its purpose.
What are the signs that my old bow roller needs replacement?
Look for signs of cracking, flat spots, excessive wear, or seizing (it doesn't spin freely). A worn-out roller can damage your boat's hull and make launching and retrieving more difficult.
Is any other hardware required for installation?
No. The package includes one polyurethane roller, two end bells, and a 1/2" diameter mounting bolt with its corresponding nut and washers, providing everything needed for a standard installation.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
Payment & Security
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