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Metal fire-resistance rated door with a lockset consisting of a locking latch bolt operated by lever handle with an escutcheon that encompasses the locking mechanism.

A lockset (alternatively lock set) is the hardware and components that make up the locking or latching mechanism that can usually be found on a door or other hinged object but can also include sliding doors and dividers.[1] The components of a lockset can include (but are not limited to) the door handle, latch bolt, dead bolt, and decorative escutcheons of the door and can consist of mortised or cylindrical mechanisms.[2] The lockset and associated hardware typically defines a door's function and how a user would (or cannot) access the two adjacent spaces defined by the opening associated with the lockset. The Americans with Disabilities Act of 1990, under Title III, and many state and local governments regulate locksets in buildings occupied by the public. Typically, locksets that employ door knob controlled latches are forbidden for public use in favor of lever handles, which are easier to operate by gravity instead of the grasping and turning required by knobs. Many municipalities also regulate locksets in terms of fire rating, using standards determined more broadly by national or international organizations such as Underwriters Laboratories in the United States or the International Code Council, which are often supplemented by local governmental organizations, e.g. New York City's Materials and Equipment Acceptance (MEA) Division of their Board of Standards and Appeals (BSA),[3] or by local building codes.

Door functions[edit]

Lockset manufacturers generally describe locksets in terms of how a door is operated by a user, while the American National Standards Institute, or ANSI, assigns the functioning of locksets individual alphanumerical codes also in relation to the door's operation.[4] For example, a "passage latch", a common industry term, on a mortised lockset is a door with a lockset consisting of two turning handles, both of which are never locked. This door function would be given the code of "F01" by ANSI. Alternatively, for a cylindrical passage latch, the ANSI code is F75.[5]

Common Door Functions Description Example locations
Classroom Outside and inside lockable by key, inside handle always unlocked Classrooms, commercial storage closets
Dummy Fixed knob or lever on one side only Decorative doors, cabinets, office restrooms
Passage Rotating door handles, neither of which lock. Residential closets
Privacy Lockable on one side commonly by push-button, emergency release on opposite side. Single stall or residential bathrooms, offices, bedrooms
Store Room / Vestibule Always locked on outside requiring key for entry with rotating door handle on the inside which never locks for safe exit. Commercial: storerooms, closets, apartment / office buildings, shared exterior entry / exit, commercial bathrooms, interior offices, fire exits, electronic strikes.


  1. ^ "Lockset - Definitions from Dictionary.com". dictionary.reference.com. Retrieved 2010-10-20. 
  2. ^ "Fire-rated Glass and Framing Glossary". fireglass.com. Retrieved 2010-10-20. 
  3. ^ "What is an MEA Number?". Permitspace.Blogspot.com. Retrieved 2012-06-27. 
  4. ^ "What Does ANSI/BHMA Grading Mean?". kwikset.com. Retrieved 2010-10-21. 
  5. ^ "Lock Functions". kamdoor.com. Retrieved 2010-10-21.