Mortise EN 1125 devices place the lock case inside the door edge, delivering a cleaner, flush aesthetic while keeping the full-width touch bar for public-access egress. They are suited to projects with higher design requirements or narrow-stile constructions, provided the door can be prepared accurately and the approvals match your fire-door certificate.
A mortise system seats the main lock case within the door rather than on the surface. From the outside you primarily see the horizontal touch bar and a neat edge plate, which reduces visual bulk. Choose mortise when you need a refined look, or when the door profile benefits from an embedded lock case.
Compare configurations → /panic-exit-devices-en-1125/
Advantages
Flush appearance — minimal projection and a tidy sightline.
Protected lock case — components are shielded within the door.
Controlled feel — bar operation with a solid, positive latch action.
Considerations
Door preparation — accurate edge routing/slotting is required; template precision matters.
Service access — some maintenance tasks may be more involved than on a surface rim device.
Lead time/compatibility — confirm trims, cylinders and strikes are the correct mortise variants.
If you need faster install and simpler service on a single door, a rim device could be a better fit → /rim/.
For pairs of doors, consider vertical-rod or double-door kits → /vertical-rod/ · /double-door-kits/.
Door thickness & edge build-up — confirm the mortise case fits and is centred.
Single vs double — mortise is common on single doors; for pairs, evaluate vertical-rod kits.
Narrow-stile profiles — verify plate widths and fixing centres.
Fire-door? The mortise device, trims, strikes and fixings must all be approved for your certificate.
Outside trim & cylinder — choose the mortise-compatible versions.
Sizing help → /door-size-compatibility/
Mortise strikes differ from rim keepers. Ensure the strike profile matches your frame material and any centre mullion or meeting stiles.
Check latch throw and alignment to avoid slow return.
Confirm handing and bar height before drilling.
Test relatching with the door under closer control before final tightening.
See matched parts in Accessories → /accessories/
EN 1125 applies to public-access routes where users must exit without prior knowledge.
Many mortise devices are fire-door compatible. Always match the device approval with the door leaf certification and use the specified fixings.
Keep an inspection log (force, alignment, fixings, signage) to support audits.
Read more → EN 1125 Guide /bs-en-1125-guide/ · Inspection Checklist (PDF) /inspection-checklist/
Outside trims (lever/knob) designed for mortise devices.
Cylinder kits matched to the trim and lock case specification.
Strikes/keepers for your frame or mullion solution.
Dogging keys/covers for authorised hold-open on non-fire doors (check local rules).
Browse → /accessories/
How to Install a Push Bar — confirm bar height, use the mortise template and check edge prep. /how-to-install-push-bar/
Maintenance & Troubleshooting — slow return, latch feel, strike alignment. /maintenance-troubleshooting/
Downloads & datasheets — /installation-pdfs/
Commercial frontages & public buildings — cleaner sightlines with compliant operation.
Narrow-stile or premium interiors — embedded lock case reduces projection.
Refurbishments with aesthetic constraints — where a visible rim case is not preferred.
See more use cases → /solutions/
Q1: When should I choose mortise rather than rim?
Use mortise for a flush appearance or narrow-stile needs, provided precise door prep is feasible. Choose rim for simpler single-door retrofits.
Q2: Can mortise devices be used on fire doors?
Many can. Ensure the device, strike and fixings are approved for your specific door certificate.
Q3: Are outside trims and cylinders different for mortise?
Yes. Use mortise-compatible trims and cylinders; mixing variants can cause mis-operation.
Q4: Is installation harder than rim?
Door edge preparation makes mortise more exacting. Follow the template strictly and test latch engagement before final tightening.
Q5: Can mortise be used on double doors?
Sometimes, but vertical-rod systems or double-door kits are typically better for two-point latching on pairs.
Send door thickness/edge details, single or double, public access (yes/no), fire-door status and photos. We’ll propose a compliant mortise configuration with an itemised price in £.
Request a Quote → /quote/
Use the Selector → /product-selector/
