Cylindrical locksets are used most often. These locks take the standard 161 prep which is a
2 1/8" crossbore, 2 3/4" backset, and a 2 1/4" x 1 1/8" square corner door edge cut out. The standard strike
plate with these locks is the 497 ANSI which is 4 7/8".
Mortise locks provide the highest level of security. The prep for this lock is an 8" x 1 1/4"
edge cut out with holes drilled in the face of the door at locations depending on the different
lock functions required. The lock body inserts into the edge prep so it is recessed into the
door. The handles and cylinders (if required) are then installed through the door into the lock
Hollow metal doors come prepped for the cylindrical
or mortise locks. Blank lock doors are also available so they can be prepped for
different backsets, special locks, or lock preps at special locations. Standard hollow metal frames are
prepped for the 497 ANSI strike but blank jambs are also available so they can be prepped for special
strikes in a hollow metal shop.
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