How to Choose a Commercial Mortise Lock
A commercial mortise lock is a rectangular case mortised into the door edge and paired with trim (levers, knobs, roses or escutcheons). Specifying the right unit means matching five decisions to the opening: lockset vs deadlock vs trim-only, duty/grade, lock function, trim style, and whether the case needs to be electrified for access control.
Step 1: Lockset, deadlock or trim?
Start with what you are buying:
- Mortise locksets — complete cases with latch (and often deadbolt) plus levers or knobs for a full door operation.
- Mortise deadlocks — bolt-only cases when a latchset is not required (or is already on the door).
- Mortise trim — levers, knobs, paddles and specialty trim matched to an existing case (including behavioral-health / anti-ligature trim).
Step 2: Set the duty and grade
High-traffic institutional doors should carry ANSI/BHMA Grade 1 hardware. Abuse-prone openings often call for heavy-duty cases; restricted keyways and enhanced cylinder security sit under high security.
Step 3: Choose the lock function
Function codes (entry, storeroom, classroom, office, institutional, privacy, passage, and more) define how the outside and inside levers operate and whether a key or thumbturn retracts the bolt. Confirm the ANSI function on the product page against the door schedule. The functions & trim guide covers the common commercial functions and how trim packages map to them.
Step 4: Match trim style to the case
Trim is not interchangeable across every series. Choose:
- Escutcheon (full-plate) for a finished architectural look that covers a larger prep.
- Sectional when rose and trim pieces are specified separately.
- Rose trim for a compact round rose without a full plate.
Stainless and specialty finishes (including stainless steel) matter in corrosive or healthcare environments. Finish codes are covered in the BHMA finish guide.
Step 5: Mechanical vs electrified
Mechanical electrified cases (fail-safe / fail-secure solenoids) that integrate with access control live in electrified mortise locks — for example Cal-Royal SC400. Keypad, prox and networked smart mortise locks belong under Access Control, not in this mechanical hub.
Quick selection shortcuts
| If the opening is… | Start with |
|---|---|
| High-traffic institutional corridor | Grade 1 lockset, sectional or escutcheon trim |
| Bolt-only auxiliary locking | Mortise deadlock leaf |
| Healthcare / behavioral health | Behavioral-health or stainless trim |
| Access-control integration (no keypad) | Electrified mortise lockset |
| Replacing levers on an existing case | Mortise Trim leaf — match series |
Browse the hub Commercial Mortise Locks or jump straight to locksets, deadlocks or trim.