20-22mm Square Expanding Tube Adaptor for Bolt Hole Castors Black Plastic with Threaded Stud

Castor Accessories

This square expanding tube adaptor lets you fit a single bolt hole castor into the open end of a square tube leg with an internal size of 20mm to 22mm. Push it into the tube, tighten the stud and the ribbed body expands to grip the inside walls firmly. The threaded stud left at the bottom then takes your bolt hole castor, turning a plain tube-framed trolley, table, rack or workbench into a mobile one.

If you are looking for a square tube castor insert, a 20mm to 22mm square tube adaptor, an expanding castor fitting for box section legs or a simple way to add wheels to square tube furniture, this adaptor is a quick, tidy and reliable solution.

Why Choose This Adaptor

• ✓ Expanding grip locks firmly inside the tube as the stud is tightened, with no welding or drilling.
• ✓ Suits square tube with a 20mm to 22mm internal size.
• ✓ Threaded stud for fitting a single bolt hole castor.
• ✓ Ribbed black plastic body with grey expanding cones for a secure, even fit.
• ✓ Supplied complete and ready to fit.

* Castor sold separately. Measure the inside of your square tube before ordering: this adaptor suits an internal size of 20mm to 22mm.

Where It Works Best

This adaptor is ideal for square tube warehouse and stock trolleys, catering and serving trolleys, mobile workbenches, shop display stands, clothes rails and box-section furniture. It is a neat way to add castors to a frame that has open square tube legs and no mounting plate.

Frequently Asked Questions

How does an expanding tube adaptor work?

Push the adaptor into the open end of the tube, then tighten the stud. This draws the cones together and pushes the ribbed body outwards so it grips the inside of the tube firmly.

What size tube does it fit?

It suits square tube with an internal size of 20mm to 22mm. Measure across the inside of the tube, not the outside, before ordering.

Is a castor included?

No, the castor is sold separately. The adaptor is designed to take a single bolt hole castor on its threaded stud.

Can I use it on round tube?

No, this version is shaped for square tube. For round tube legs, choose a round tube adaptor in the matching size.

Do I need to drill or weld the tube?

No. The adaptor grips inside the tube by expansion, so no drilling or welding is needed as long as the tube end is clean and open.