Glass Sliding Track & Runners: Types, Sizes & How to Fit
A glass runner track is the simple pair of channels that lets a glass panel slide open and shut, in a cabinet, a display unit, a wardrobe or a vivarium. You fit one track along the top and one along the bottom, drop the glass in, and it slides. This guide covers what a glass runner track is, the two types we stock and when to use each, the difference between 4mm and 6mm glass, the sizes available, and how to measure, cut and fit the track cleanly.
What is a glass runner track?
A glass runner track, also called a glass channel track or glass sliding track, is a plastic profile with a groove that a pane of glass sits in. It comes as a pair: a deeper channel for the top and a shallower one for the bottom. The extra depth up top lets you lift the glass into the top track, then drop it down into the bottom, so the panel is captured but still slides freely.
Run two panels side by side in a double channel and they pass each other, which is how sliding glass doors on a cabinet or vivarium open without swinging out into the room.
The two types of glass runner track
We stock two, and the right one depends on how you are mounting it.
Standard double channel track (glues or screws to a flat surface)
The standard glass runners track is a flat-backed double channel that fixes to a flat surface, top and bottom, with adhesive or screws. It takes both 4mm and 6mm glass, so it suits most cabinets, display cases and vivariums where you are fixing to a flat panel or frame. If in doubt, this is the versatile choice.
Standard double channel track (4mm and 6mm, top and bottom)
Clip-on double channel track (pushes onto a 15mm or 18mm board edge)
The clip-on version does away with glue and screws. It clips straight onto the edge of a 15mm or 18mm board, so it is the quick option when your cabinet or vivarium is built from standard panel board. It is designed for 4mm glass, top and bottom. If your carcase is 15mm or 18mm board, this saves a job.
Clip-on double channel track (4mm, top and bottom)
4mm or 6mm glass?
The channel has to match the glass thickness or the panel either will not fit or rattles. The standard track takes both 4mm and 6mm, the clip-on is made for 4mm.
Thinner 4mm glass is lighter and cheaper and fine for smaller doors. Step up to 6mm for larger panels, where the extra weight and rigidity keep the glass flat and sliding smoothly. Measure your existing glass or decide the thickness before you order the track, since the two are a matched pair.
Expert tip: if you are cutting new glass to fit, order the track first and size the glass to it. It is far easier than trying to find a track to suit glass you have already had cut.
Top track and bottom track: why they differ
The top channel is deeper than the bottom on purpose. To fit the glass you push it up into the deep top track as far as it will go, swing the bottom edge in over the shallow bottom track, then let it drop down so it settles into the bottom channel. That extra headroom in the top track is what lets you get the glass in and out without removing anything.
Fit them the wrong way round and the glass will not go in, so keep the deep track at the top every time.
Glass runner track sizes
Our glass runner tracks come in three lengths, 610mm, 910mm and 2440mm, so you can match a small cabinet door, a wider display or a full-length run and trim to fit. Buy the length that covers your opening in one piece where you can, since a single track slides more smoothly than two butted together.
How big should the glass be?
The glass has to be cut a little shorter than the full opening height, so it clears the bottom track when you lift it up into the deep top channel. As a rule, size the glass height to the opening less the depth of the bottom channel, keeping enough engagement in the top track to hold the panel. On the width, two sliding panes usually overlap each other slightly so there is no gap when they are shut.
Measure twice before you cut glass. Unlike the track, glass cannot be trimmed once it is cut, so it pays to get the track fitted and measured before you order the panels.
How to measure, cut and fit a glass runner track
It is a straightforward job with hand tools.
- Measure the opening width and pick a track length that covers it in one piece.
- Cut the top and bottom tracks to length with a fine-tooth saw.
- Fit the deeper channel at the top and the shallow one at the bottom.
- Fix the standard track with adhesive or screws, or push the clip-on track onto the board edge.
- Lift the glass into the top track, swing the bottom in, and let it drop into the bottom channel.
Expert tip: lightly ease the cut ends of the track after sawing, a quick pass with a file or knife stops any burr catching the glass as it slides.
Choosing between glue and screws on the standard track? Our guide on when to glue and when to screw covers it.
Where glass runner tracks are used
- Display cabinets and shop counters
- Sliding glass doors on kitchen and living room units
- Wardrobes and cupboards
- Bookcases and shelving with sliding fronts
- Vivariums and reptile enclosures
Building a reptile enclosure specifically? Our vivarium glass channel track guide goes into that job in detail.
Common mistakes to avoid
A few things trip people up, and all are easy to sidestep.
The most common is fitting the deep channel at the bottom, which leaves no way to lift the glass in. Keep the deep track at the top every time. Next is a mismatch between glass and channel: 6mm glass will not enter a track meant for 4mm, and 4mm glass rattles in a 6mm channel, so order the track and glass as a matched pair.
People also cut the glass to the full opening height and then cannot drop it in, when it needs to be a touch shorter to clear the bottom track. And butting two short tracks to fill a wide opening leaves a bump where they meet, so use a single length wherever you can.
Frequently asked questions
What is a glass runner track?
A pair of plastic channels, a deep one for the top and a shallow one for the bottom, that a glass panel sits in so it can slide open and shut.
Why is the top track deeper than the bottom?
So you can lift the glass up into the deep top channel, swing the bottom in and drop it into the shallow bottom channel. Without the extra depth up top the glass will not go in.
What is the difference between the two types?
The standard track glues or screws to a flat surface and takes 4mm or 6mm glass. The clip-on track pushes straight onto a 15mm or 18mm board edge and is made for 4mm glass.
Does the track take 4mm or 6mm glass?
The standard double channel takes both 4mm and 6mm. The clip-on is designed for 4mm. Match the channel to your glass thickness.
What sizes do the tracks come in?
610mm, 910mm and 2440mm lengths, trimmed to fit your opening.
How do I cut glass runner track?
With a fine-tooth saw. Cut top and bottom to length and ease the cut ends so no burr catches the glass.
Can I fit sliding glass doors myself?
Yes. Fix the two tracks, deep at the top, shallow at the bottom, then lift the glass into the top track and drop it into the bottom. No special tools needed.
Do I need to remove anything to take the glass out?
No. Push the glass up into the deep top track and the bottom edge clears the bottom channel, so it lifts straight out.
Will these work for a vivarium?
Yes, both types suit vivariums. For a full reptile enclosure build, see our dedicated vivarium glass channel track guide.
Ready to buy?
Browse the full range of glass sliding tracks, choosing between the standard 4mm and 6mm double channel and the clip-on track for 15 or 18mm board. Fast UK-wide delivery from our Barnsley warehouse, same-day dispatch before 12pm.
The full range of glass sliding tracks
