If you have ever received a hardware submittal back with a red-line on the lock function, there is a reasonable chance the specifier or contractor confused office function with entrance function. These two BHMA/ANSI codes are among the most commonly swapped on commercial hardware schedules, and the consequences range from a simple field correction to a full lock replacement after occupancy. This guide explains what each function actually does, where each belongs, and how to make the right call before the hardware ships.
What Is Office Function?
Office function (BHMA F05) describes a lockset where the outside lever is locked by key and the inside lever is always free. A key is required to lock or unlock the outside from a secured state. Once unlocked from outside, the latch retracts freely on both sides until the key is turned again to re-engage the locking mechanism.
In plain language: someone inside can always leave. Someone outside needs a key to get in, and an authorized person must actively lock or unlock the outside trim with a key.
What Is Entrance Function?
Entrance function (sometimes called vestibule function, BHMA F08 in some classifications) is commonly defined as a lockset where the outside lever is locked at all times except when held open by a key turn or interior thumbturn. The inside is always free for egress. The key distinction is that entrance function allows the outside to be toggled into a passage mode and left there, unlike office function, where each entry requires a key turn.
In plain language: entrance function is designed for a lobby or front door that a staff member can unlock in the morning and hold open for business hours, then re-lock at close. Office function requires a key turn every single entry.
Why the Difference Matters on a Hardware Schedule
Both functions look identical from the outside. Same lever, same rose, same finish. The mechanical difference is internal, which means a facility can receive and install the wrong function without anyone realizing it until day-to-day operation exposes the problem.
- School front office: An entrance function lockset lets staff unlock the door at the start of the day for visitor flow, then re-lock at a set time. An office function lockset would require staff to key every single visitor entry, which creates bottlenecks and security gaps in practice.
- Healthcare clinic entry: Entrance function allows the door to be held open during patient hours and secured after hours without a key turn on every entry cycle. Office function would frustrate high-traffic clinical workflows.
- Private office interior: Here office function is the correct call. An individual office that should be locked when the occupant is away does not need a hold-open capability. Office function gives the occupant key control without unintended passage mode.
- Retail stockroom door from the sales floor: This opening is often better served by storeroom function (outside always locked, key retracts latch). Specifying office function here introduces a risk that the door gets left in the unlocked state.
Cylindrical vs. Mortise: Does the Lock Body Change the Function?
Both cylindrical and mortise locksets are available in office and entrance functions. However, mortise locksets generally offer more precise function control, including the ability to add deadbolt options and monitor latchbolt position. For high-traffic or access-controlled openings, a mortise body in the correct function is more durable and more field-serviceable over time.
Preferred lines available at DoorwaysPlus.com -- including Sargent, Corbin Russwin, Hager, and PDQ -- offer both cylindrical and mortise options across these functions with stable parts availability that supports long-term maintenance rather than forcing full lock replacement on the next hardware cycle.
Electrified Applications: Function Code Still Matters
When an opening is access-controlled, many specifiers default to storeroom function with electric latch retraction. But where a hybrid approach is needed -- card reader plus key override -- the base mechanical function still drives how the outside trim behaves during a power event. A fail-secure electric lock on an entrance-function body behaves very differently from the same configuration on an office-function body when power drops. Always verify that the base mechanical function matches the sequence of operation, not just the electrical state.
How to Catch Function Errors Before They Ship
- Map each door on your schedule to its daily use scenario, not just its security level.
- Ask: does the outside need to be held in an unlocked state for a period of time? If yes, entrance function is likely correct.
- Ask: should the outside only unlock for individual entries, with re-locking required each time? If yes, office function is likely correct.
- Flag any opening where a storeroom or classroom function might be a better fit before spec is finalized.
- Review electrified openings for function compatibility with the access control sequence of operation.
Get the Right Lockset Function the First Time
A function code error caught at the submittal stage costs nothing. The same error caught after installation costs labor, parts, and sometimes a door that has to come off its hinges. DoorwaysPlus.com carries commercial locksets in office, entrance, storeroom, classroom, and related functions from trusted lines including Sargent, Corbin Russwin, Hager, and PDQ. If you are building a hardware schedule and need to confirm function before you order, our team can help you match the correct code to each opening on your project.
Shop locksets by function at DoorwaysPlus.com or contact our team for specification support.