SEACHOICE Roller Shaft for 12-in Trailer Roller — 13-3/8in x 5/8in Zinc-Plated with 2 Pal Nuts

Heavy-duty zinc-plated steel roller shaft with two included pal nuts, sized to fit a 12-inch trailer roller and resist marine corrosion.

This replacement roller shaft from SEACHOICE is built for boat trailers that need a dependable axle for a 12-inch roller. The shaft measures 13-3/8 inches overall with a 5/8-inch outer diameter, and it comes with two pal nuts for secure attachment. Zinc plating provides a layer of corrosion resistance appropriate for freshwater and saltwater exposure, and the simple design makes installation and replacement quick for DIYers and pros alike.

Will this shaft fit my 12-inch trailer roller?

Yes — the shaft is engineered to accommodate a 12-inch roller. Its overall length and outer diameter match common roller specifications so it slips through standard cores and seats properly inside the roller assembly.

• Overall shaft length: 13-3/8 inches — sized to clear roller ends and mounting brackets
• Shaft outer diameter: 5/8 inch — fits typical roller bore sizes
• Includes two pal nuts to fasten the shaft securely

How does the zinc plating help in marine conditions?

Zinc plating creates a protective coating that slows rust and surface corrosion when exposed to moisture, salt spray, and trailer washdowns. It’s not a lifetime corrosion barrier but offers better longevity than plain steel for routine boating use.

• Zinc layer reduces oxidation compared with unplated steel
• Easy to clean — salt and grime rinse off during maintenance
• Suitable for freshwater and occasional saltwater exposure with regular inspection

How do I install the replacement shaft and pal nuts?

Installation is straightforward: slide the shaft through the roller core and align with the trailer bracket, then thread and tighten the supplied pal nuts to lock the shaft in place. Basic hand tools are usually all you need, and the included hardware simplifies replacement.

• Slide shaft through roller and bracket; ensure centered alignment
• Thread pal nuts onto shaft ends and secure with a wrench
• Inspect roller spin and clearance before final tightening

What are the key specs and part number I should note?

Keep the manufacturer part number handy for ordering and matching with other trailer parts. The shaft’s length and diameter are the main measurements to confirm compatibility with your roller and mounting hardware.

• Manufacturer part number: 50-55811 for ordering accuracy
• Shaft length: 13-3/8 inches to suit 12-inch rollers
• Shaft outer diameter: 5/8 inch for standard roller bores

Who this is for: This SEACHOICE roller shaft assembly is aimed at boat owners, trailer maintenance technicians, and watersports enthusiasts who need a reliable replacement shaft for a 12-inch trailer roller. It’s ideal for those who prefer a straightforward, durable part that’s easy to install and offers improved corrosion resistance over unplated steel. Choose this part when you want a practical, OEM-compatible solution to restore roller performance and keep your boat trailer operating smoothly.