Where are the adjustment screws on a sliding glass door?

Usually a small hole at each end of the bottom rail of the sliding panel, on the face or the end, sometimes behind a round plastic plug. Some doors have them on the edge of the panel just above the rail. Check your manufacturer if they are hidden.

Which way do I turn the screw to raise the door?

On most brands clockwise raises that end of the panel and counter-clockwise lowers it — but makers differ, so turn a quarter turn, look at the gap, and reverse if it went the wrong way.

How much should I turn it?

A quarter turn at a time, testing between turns. The aim is a panel that clears the sill by a hair, has an even gap at the latch edge top to bottom, and whose lock hook meets the keeper.

The screw turns but nothing happens. Why?

The roller housing or its thread has broken, or the screw is already at its stop and the rollers have worn down. Either way there is no adjustment left and the rollers need replacing.

Sliding Door Roller Adjustment Guide — Which Screw, Which Way

How this works

A sliding panel sits on two adjustable rollers, one at each end of the bottom rail. Raising one end tilts the panel, which is how a gap at one corner or a lock that misses its keeper is squared up. The side that rubs and the corner with the gap tell you which end is low.

The screws have a small range. When it runs out — the screw tight against its stop, or spinning freely — the rollers have worn down and adjustment cannot bring the panel back. That is the point at which new rollers restore the range.

It runs in your browser and nothing you enter is sent anywhere. It is a guide, not a diagnosis — door makers differ, so check your manufacturer where it says to, and the technician confirms what has actually worn when they see the door.

Questions people ask

Where are the adjustment screws on a sliding glass door?: Usually a small hole at each end of the bottom rail of the sliding panel, on the face or the end, sometimes behind a round plastic plug. Some doors have them on the edge of the panel just above the rail. Check your manufacturer if they are hidden.
Which way do I turn the screw to raise the door?: On most brands clockwise raises that end of the panel and counter-clockwise lowers it — but makers differ, so turn a quarter turn, look at the gap, and reverse if it went the wrong way.
How much should I turn it?: A quarter turn at a time, testing between turns. The aim is a panel that clears the sill by a hair, has an even gap at the latch edge top to bottom, and whose lock hook meets the keeper.
The screw turns but nothing happens. Why?: The roller housing or its thread has broken, or the screw is already at its stop and the rollers have worn down. Either way there is no adjustment left and the rollers need replacing.

Which screw do I turn, and which way?

How this works

Questions people ask

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