Lockset

[1] The components of a lockset can include (but are not limited to) the door handles (commonly both inside and outside), latch bolt, dead bolt, face plate, strike plate, escutcheon, thumbturn, push button, turn button, and other trim.

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 doorknob-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)[2]), or by local building codes.

For example, mandates of building code may forbid (e.g., E2141/F16 "Double-Keyed Deadbolt") from group occupancies, or require (e.g., F93/F15) certain functions on hotel or motel doors.

[citation needed] Commercial, highest grade security and durability; can survive a 360-pound (160 kg) weight test.

Residential, with excellent security and durability; can survive a 250-pound (110 kg) weight test.

[3] The mortise mechanism is enclosed in a box (usually metal), requiring installation in a rectangular cavity carved into the edge of the door.