Guide to Door Lock Measurements

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Guide to Door Lock Measurements Powered By Docstoc                                                         Published 1/13/2005

                               Guide to Door Lock Measurements

               For Questions or Concerns, please refer to All About Doors & Windows

When replacing or newly installing a door lock, there are measurements you need to know before you
place an order on your lock...

Lock Bore
The diameter of the hole for the lock body. The standard bore is 2-1/8”. Many older doors had bores
that could have been smaller. Most of the current locks require the standard 2-1/8” bore. If one wants to
replace their locks on doors that have smaller diameter holes there are 2 options. First, doors can
usually be re-drilled. Secondly, there are a few lock companies, like Weiser, that make locks to fit the
smaller bore.

The distance from the edge of the door to the center of the lock bore. Two standard backsets are 2-3/8”
and 2-3/4”. Other backsets include 2”, used by National and Lori Lock, and 5” used by Weiser,
Weslock, Kwikset and others. There are also extensions for some brands, like Schlage, that can extend

              All About Doors & Windows    |   1901 Cherry St. Kansas City, MO 64108-1714                                                              Published 1/13/2005

the latch enough to have the lock located in the center of the door. When replacing locks the latch
backset needs to match the holes bored in the door.

Lock Spacing
The distance between two locks. When boring deadbolt locks in a door, there are two standards for
spacing between the bottom lock and the deadbolt. The two most common are 5-1/2” and 6” from the
centers of the two holes. There are other combinations of spacing which are used on specialty locks,
however. When adding a deadbolt lock, your best choice would be one of standard measurement.

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              All About Doors & Windows      |   1901 Cherry St. Kansas City, MO 64108-1714
 Cherry St. Kansas City, MO 64108-1714

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Description: Guide to Door Lock Measurements