door. Inside nearly always refers
to the side of the door without
a cylinder. There are functions
with cylinders on both sides of
the door but these functions will
be adequately described by the
manufacturer. This is the termi-
nology used by manufacturers
and it would serve you well to
not only understand it but also
Passage (figure 5a & 5b)
F01 for mortise, F75 for
The good thing about functions is that their name gives us
clues to their use or operation.
Passage function locks are a
good example of this. They allow
passage no matter which side of
the door you are on. No key is
required and passage locks cannot be locked.
Passage function locks are
ideal where doors are either
required, such as by code, or
desired to latch but not lock.
Examples of their usage include
common areas and on stairwell
doors. They are also commonly
used in conjunction with dead-
bolts where allowed.
Privacy (figure 6A & 6b)
F02, F19, or F22 for mortise,
F76 for cylindrical
Privacy function locks allow
an occupant inside of a room to
lock the door from the inside
via a thumb-turn or push button.
Turning the inside trim retracts
the latch and/or deadbolt. Furthermore, there is an emergency
override on the outside that can
be operated with a coin, standard
screwdriver, or similar object
that allows the door to be opened
in the event of an emergency.
For mortise locks, F22 utilizes a
latchbolt, no deadbolt. F02 and
F19 incorporate a deadbolt. On
F19 function mortise locks, the
latch cannot be retracted by the
outside trim when the deadbolt
is thrown, on F02 function mortise locks it can (the latch and
deadbolt operate independently).
Privacy function locks are common on restroom doors as well
as interior residential doors.