How it connects
A concave or U-grooved wheel rests directly on a cylindrical rail, maintaining rolling contact along the length of the track under gravity/load, often restrained from derailing by an anti-jump pin or bracket.
Male and female halves
The cylindrical track acts as the guide rail/male profile, and the concave grooved wheel roller acts as the mating female saddle/riding element.
Usually connects to
- round rail track
- sliding barn door roller hanger
Common sizes
- Typically 20 mm to 25 mm (approx. 1 inch) outside diameter round rail for architectural/interior hardware; heavy-duty agricultural round track systems can reach 1-1/2 to 2 inches (e.g. CannonBall round track).
Where it is used
interior architectural sliding doorssliding barn doorsrolling ladder systemscommercial sliding partitions
Variations
- top-mount roller hanger
- side-mount (strap/face mount) roller hanger
- enclosed round track trolley system
How to recognise it
Recognised by a polished or powder-coated round cylindrical pipe/rod mounted horizontally to a wall, supporting an exposed hanging door bracket with a wheel whose circumference is grooved to fit the curve of the cylinder.
Often confused with
| Confused with | How to tell them apart |
|---|---|
| Flat track barn door roller | Flat track uses a flat rectangular bar with a flat-profile or flanged wheel, whereas round rail uses a circular tube or bar with a concave/U-groove wheel. |
| Box track / enclosed track trolley | Box track encloses dual-wheel trolleys inside a rectangular or C-profile channel rather than riding exposed on top of an external round tube. |
Also called
round rail barn door tracktubular track sliding door roller interfaceround track roller hanger
Good to know
Architectural sliding hardware commonly features 25 mm (1 in) or 20 mm round stainless steel tube tracks. Agricultural applications often use larger slotted round track profiles.
Related connections
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