How it connects
Trolleys roll freely along the internal runner channels; track sections butt together end-to-end secured by an external clamping splice bracket, while press-fit caps enclose terminal ends.
Male and female halves
Female socket/profile end receiving male trolley rollers internally, or male member inserted into external splice sleeves/brackets.
Usually connects to
- Compatible box-rail trolley wheels/roller assembly with hanger pendant or carriage bolt
- Matching splice/joint sleeve around rail ends
- Matching press-fit end cap
Common sizes
- Typical barn-door box rail about 1-3/4–1-7/8 in wide × 2-1/4 in high, with listed envelopes 45–48 × 57–62 mm, including 47.5 × 61.5 mm.
- Bottom slots commonly 12–20 mm, including a 16.5 mm example.
Where it is used
Agricultural and barn sliding doorsCommercial / industrial warehouse sliding doorsExterior shed doorsindustrial curtain tracksoverhead conveyor systems
Variations
- Stainless steel box track
- Aluminum sliding box track
- heavy-duty galvanized steel box track
- aluminum enclosed track
How to recognise it
Rectangular hollow metal section open at the cut end with two inward curled lower lips creating a central longitudinal slot along the bottom.
Often confused with
| Confused with | How to tell them apart |
|---|---|
| Strut channel slot (Unistrut) | Strut channel typically has continuous slotted or perforated back and inward-turned lips for spring nuts, whereas box rail has rounded bottom runner lips specifically contoured for trolley wheels and smooth rolling. Strut channel features inward-turned gripping lips with serrations intended for spring nuts, whereas box rail tracks have rounded or smooth rolled flanges designed as bearing raceways for wheels. |
| Round rail / tubular track | Round rail uses a cylindrical tube with a bottom slit, whereas box rail is rectangular/square in cross-section. |
| 80/20 T-slot | T-slots are solid extruded aluminum profiles designed for structural clamping nuts rather than hollow enclosed tracks for rolling wheeled trolleys. |
Also called
Box rail profile endSliding barn door track open endBox trolley track endbox rail track slottrolley track slotsliding door box track slotenclosed track slot
Good to know
Commonly manufactured by brands such as National Hardware, Everbilt, Richards-Wilcox, and CannonBall for heavy-duty sliding doors.
Related connections
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