MPLock Identifier
Identify your lock now!
Identify your lock now!
Multipoint Lock System
Multipoint locks can feel confusing at first because several parts and measurements work together instead of a single latch.
Once you see how the system moves as one unit, it becomes much easier to measure correctly, avoid wrong orders, and spot common alignment issues.
The two diagrams below give you a quick, practical view of what is inside the door and what you should measure when identifying or replacing multipoint hardware. You will most commonly see these systems on patio doors, French doors, and many high-end entry doors.
Quick Takeaways
- Multipoint locks are one connected mechanism, not separate parts acting independently.
- Most issues come from mismatch or alignment, not just “a bad handle.”
- Accurate measurements are the fastest way to identify compatible replacements.
Key components found in many multipoint lock setups.
The measurements and reference points used to match parts correctly.
What the System Is Actually Doing
A multipoint lock system ties the handle, gearbox, and locking points into one connected mechanism. Unlike a standard single-point lock, it secures the door at multiple locations along the frame. When you lift the handle, the gearbox transfers that motion into the long lock strip, engaging hooks, rollers, or shootbolts along the door edge. When everything is matched and aligned, the door pulls in snug and locks smoothly.
The Parts People Notice First
On the hardware side, the spring latch handles everyday closing, while the deadbolt adds security. Some locks include a mishandling device, which blocks the mechanism unless the door is in the closed position. The interior and exterior escutcheon plates hold the handles and cylinder in place, and many systems include an alignment mark that helps keep handle height consistent during assembly.
If the door feels stiff, the key will not turn, or the handle will not lift smoothly, it is often a clue that something in this chain is out of alignment rather than a single part failing on its own.
Measurements That Prevent Wrong Orders
- PZ: center of handle to center of cylinder/key.
- Backset: door edge to the center of the cylinder.
- Handle height: bottom of the door to the center of the handle.
- Overall length: the full length of the lock strip from top to bottom.
- Locking positions: where the top and bottom locking points sit relative to the handle.
The goal is to match the original system as closely as possible. Even one measurement being off can cause the locking points to miss the strikes, the handle to bind, or the door to stop sealing correctly.