How it connects
The wheeled roller carriage is inserted into the end of the extruded track profile, where the bottom return flanges capture and support the rolling wheels while allowing the central hanging bolt or bracket to traverse along the bottom slot.
Male and female halves
Female captured channel/track profile mates with male wheeled roller carriage assemblies inserted internally.
Usually connects to
- pocket door roller carriage
- top-hung sliding door hanger
- trolley hanger assembly
Common sizes
- Track lengths typically range from 36 inches to 16 feet (or longer); track extrusion width commonly spans 1 to 2 inches accommodating wheels 7/8 inch to 1-1/4 inches in diameter.
Where it is used
residential constructioncommercial interiorsarchitectural door hardwareinterior sliding and pocket doors
Variations
- box track (square profile with bottom slot)
- convex rail/v-groove rolling track (e.g. Johnson 100/111 series / Prime-Line)
- heavy-duty commercial multi-wheel carriage tracks
- soft-close integrated tracks
How to recognise it
Look for an extruded aluminum or roll-formed steel channel mounted at the top jamb/header with an inverted profile having inward-facing bottom flanges/lips that retain nylon or ball-bearing multi-wheel carriages rolling inside.
Often confused with
| Confused with | How to tell them apart |
|---|---|
| Flat track barn door hardware | Barn door flat tracks use exposed external wheels rolling on top of a solid bar or rail, whereas pocket door captured tracks enclose and capture the roller carriages inside a hollow channel. |
| Bottom-rolling sliding door track | Bottom-rolling tracks are floor-mounted tracks supporting wheels mounted at the bottom of the door, whereas pocket door captured tracks are overhead top-hung suspension systems. |
| Bifold door track | Bifold door tracks guide pivot pins and slide guides rather than supporting the full suspended sliding weight on multi-wheel tandem roller carriages. |
Also called
pocket door box trackpocket door track and roller assemblyenclosed overhead door trackcaptured sliding door track
Good to know
While individual manufacturers (such as Johnson Hardware, Hafele, CS Cavity Sliders, Prime-Line, Stanley, and Hager) use proprietary channel profiles and carriage wheel spacings, they all operate under the standardized category of top-hung captured box track / sliding door hardware governed by ANSI/BHMA A156.14.
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