Manutec Boat Roller Bracket Stem Clamp Holder Adjuster for 50x25mm Rail – Galvanised (SKU: CLAMP-ADJWB50X25)

The Manutec Boat Roller Bracket Stem Clamp Holder Adjuster is a precision-designed clamp-on solution for 50mm x 25mm trailer rails. Built to accommodate 20mm square roller stems via a 21x21mm steel tube, this compact clamp is perfect for securing keel rollers or support posts on small to mid-sized trailers.

• Rail Fit: Designed for 50mm high x 25mm wide trailer frames.
• Stem Fit: 21x21mm tube perfectly fits 20mm square roller stems.
• Mount Type: Bolt-on clamp – no welding or drilling required.
• Material: Hot-dip galvanised steel for marine-grade corrosion resistance.
• Removability: Easy to remove, reposition, or replace.
• Use Case: Ideal for light-duty trailers, narrow frames, or compact roller support systems.

Whether you’re setting up a new trailer or upgrading your roller system, this adjustable clamp gives you strength, flexibility, and a rust-resistant finish built for Australian conditions.

Frequently Asked Questions

• Q: What roller stem does it fit?
  A: It fits 20mm square stem posts via a 21x21mm internal tube.
• Q: What size rail is this made for?
  A: This clamp suits 50mm high x 25mm wide trailer rails.
• Q: Is it easy to install?
  A: Yes, it’s a bolt-on style clamp that installs quickly without needing to drill or weld.
• Q: Will this work on saltwater trailers?
  A: Absolutely – it’s made from galvanised steel for corrosion resistance in marine environments.

Is This Clamp Right for You?

The CLAMP-ADJWB50X25 is ideal if you:

• Have a trailer frame that’s 50mm tall and 25mm wide.
• Need to mount or adjust a 20mm square roller post.
• Want a removable, bolt-on clamp that avoids drilling and welding.

Not suitable for:

• Rail sizes other than 50x25mm – for those, explore our full clamp range.
• Non-square stems, oversized posts, or extreme heavy-duty loads.

Quick Installation Guide:

1. Place the clamp over your 50x25mm trailer rail.
2. Insert your 20mm square roller post into the 21x21mm stem holder tube.
3. Secure with the provided bolts for a tight and stable fit.
4. Recheck alignment and roller height before towing.