MPLock Identifier
Identify your lock now!
Identify your lock now!
Locking Positions on Multipoint Locks
Locking positions on a multipoint lock describe the distance from the center of the handle to each locking device along the edge of the door, including hooks, rollers, shootbolts, or tongues.
These measurements are one of the most important factors when replacing a multipoint lock. Even a correct brand and overall size will fail if the locking points do not align with the existing strikes in the frame.
Most “almost fits” replacements fail because of this. The handle lines up correctly, but the hooks, rollers, or bolts land in the wrong locations.
Locking positions are measured from the handle center to each locking device location. Use this as a quick reference when comparing an old lock to a replacement.
Measurements
Locking positions are measured from the center of the handle spindle outward along the faceplate. This reference point is closely related to the lock’s handle spacing (PZ measurement), which determines where the handle and cylinder align in relation to the internal mechanism.
- Handle center to upper hook or roller
- Handle center to lower hook or roller
- Handle center to top shootbolt (if present)
- Handle center to bottom shootbolt (if present)
A Simple Way to Capture Locking Positions
1) Start at the Handle
Use the handle spindle center as your reference point, not the top or bottom of the door.
2) Measure Each Device Separately
Measure straight up and down along the faceplate to every hook, roller, or bolt.
3) Compare Before You Buy
Confirm measurements against the replacement lock before installing it in the door.
Signs the Locking Positions Don’t Match
- Hooks or rollers hitting solid frame instead of entering the strike
- Door requires force to lock or unlock
- Lock installs but will not engage smoothly
- Top or bottom devices appear slightly above or below strike openings
Important distinction: Two locks can be identical in overall length and still be incompatible if the locking positions differ.
Why Segmented Locks Depend on Locking Positions
On multipoint systems that use extensions, the layout of those sections determines where locking devices land on the door. This is why replacement success depends on matching the original layout rather than relying on door height alone.
Practical Tips Before Ordering
- Always measure from handle center, not from the top of the door
- Record every locking device position, not just one
- Do not assume same brand guarantees compatibility
- If the lock will not engage with the door open, this may relate to the mishandling device, not the measurements