An aluminium sliding door lock must match the door profile, glass position, frame depth, sliding direction, and existing hardware. Installing a lock is not simply a matter of drilling two holes and tightening several screws.
The locking body, handle, cylinder, hook, and keeper must align correctly when the door reaches the closed position. If the lock is installed too high, too low, or too deep inside the profile, the hook may not enter the keeper fully. The door may appear locked while remaining loose or easy to force open.
Before starting, identify the door system and confirm that the selected lock is designed for an aluminium sliding door.
Aluminium sliding doors use several common locking structures:
Hook mortise locks
Sliding-door latch locks
Key-operated handle locks
Multi-point locking systems
Surface-mounted patio bolts
Child-safety locks
Flush pull locks
A direct replacement is usually easier than changing to a completely different lock type because the door may already have cut-outs for the lock body, spindle, cylinder, and fixing screws.
The vertical section holding the lock is commonly called the lock stile.
Measure:
Stile width
Internal cavity depth
Existing faceplate dimensions
Distance from the door edge to the handle center
Screw-hole spacing
Cylinder position
Hook projection
Keeper position on the frame
Do not assume that two locks with similar handles use the same internal dimensions.
Many aluminium sliding doors use narrow profiles with glass positioned close to the lock cavity.
Drilling too deeply or in the wrong location can damage the glass, glazing bead, weather seal, or internal reinforcement.
Use the door drawing when available. When the internal structure is unknown, ask the door manufacturer or an experienced installer to confirm the safe fixing area.
The lock should be installed through the Aluminium Profile and approved hardware openings. Do not drill, cut, or grind the glass to make a standard lock fit.
A lock that requires glass modification is normally unsuitable for that door.
The exact tools depend on the lock, but a normal installation may require:
Tape measure
Pencil or removable marker
Lock template
Screwdrivers
Drill with suitable metal bits
Center punch
File for light edge finishing
Hex keys
Protective tape
Vacuum or brush for metal particles
Safety glasses
Suitable fixing screws
A router or cutting tool may be required for a new mortise opening, but this work should be completed carefully because aluminium profiles can contain several internal chambers.
Close the door and confirm that it slides smoothly before modifying the lock.
If the rollers are badly adjusted or the door is sagging, correct that problem first. A lock should not be used to pull a misaligned door into position.
Support the moving panel so that it cannot roll unexpectedly while measurements are being taken.
Place the lock template against the lock stile.
Check that:
The handle remains comfortable to reach
The lock body fits inside the profile
The hook points toward the correct keeper position
The cylinder does not interfere with the glass
The screws enter suitable aluminium sections
The handle does not collide with the fixed panel
Measure twice before making the first hole.
The lock and keeper must meet when the door is fully closed.
Do not position the keeper from a general measurement alone. Mark the actual hook or latch center against the frame after the lock body is temporarily fitted.
Apply protective tape over the drilling area to reduce marking and help make the layout more visible.
Use a center punch gently so the bit does not move across the finished surface. Drill small pilot holes first, then enlarge them only to the size required by the hardware instructions.
Remove metal chips immediately. Loose aluminium particles can enter the track, rollers, lock body, or drainage openings.
For a mortise lock, the opening must fit the faceplate and internal lock body without excessive clearance.
File sharp edges lightly and check that the lock slides into the profile without force.
Avoid removing more aluminium than necessary. An oversized opening can weaken the fixing area and leave visible gaps around the faceplate.
Insert the lock body and fasten it using the specified screws.
Fit the inside and outside handles, spindle, cylinder, or thumb turn according to the lock design.
Before fully tightening the screws:
Operate the handle several times.
Check that the hook extends and retracts completely.
Confirm that the cylinder turns smoothly.
Make sure the lock does not move inside the profile.
Check that the handle returns to its normal position.
Over-tightening can distort thin aluminium sections or compress the mechanism.
Close the door gently and mark where the hook meets the frame.
Install the keeper so the hook enters the opening without rubbing heavily against the top, bottom, or sides.
The keeper should hold the panel securely without forcing the door sideways.
When the hook does not align, inspect the door height before moving the keeper repeatedly.
Worn or incorrectly adjusted rollers can cause the panel to sit lower on one side. Correct roller alignment helps the lock remain consistent as the door is opened and closed.
Test the lock from both sides when the product allows access from inside and outside.
Confirm that:
The door slides freely when unlocked
The hook retracts fully
The door closes without impact
The lock engages without excessive force
The panel cannot move significantly when locked
The key can be removed normally
The handle does not contact the fixed panel
The emergency exit remains usable
Test the door several times rather than accepting one successful operation.
Avoid the following problems:
Selecting a lock before measuring the profile
Drilling close to the glass
Installing the keeper before checking door height
Using screws that are too long
Blocking drainage paths
Leaving metal particles in the track
Forcing a wide lock into a narrow stile
Using the lock to correct a sagging door
Adding a secondary lock that obstructs emergency exit
For multi-point locks, large commercial doors, or unfamiliar profile systems, professional installation is recommended.
We supply Aluminium Doors, Aluminium Windows, aluminium profiles, hardware, accessories, glass, and finished units ready for installation.
By coordinating the profile and hardware as one system, we can review the lock cavity, handle position, keeper, sliding direction, and installation details before production. This reduces the risk of purchasing a lock that does not fit the door stile.
Our aluminium door range includes sliding, swing-opening, entrance, passage, hanging, and side-pressure door structures for residential and commercial projects.
Send us the door drawing, opening dimensions, aluminium profile section, glass configuration, sliding direction, lock type, handle style, finish, access requirements, and project quantity.
We will review the complete door system and prepare an Aluminium Sliding Door Lock configuration with matching profiles, hardware, and accessories.