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Glossary of Terms
Chassis The body of the lock itself without any trim.
Cylinder The portion of a lock containing plug with key-
way and a body with pin tumbler mechanism.
The properly cut key allows the cylinder to
rotate the driver mechanism which unlocks the
door.
Hand A term used to indicate how a door swings.
Pin Tumbler
Mechanism
Most key operated locks provide limited access
through the use of pin tumblers.
Pin Tumblers Small sliding pins in a lock cylinder that work
against coil springs. They prevent the cylinder
plug from rotating until the appropriate length
pin is raised to the proper height by correspond-
ing notch depth cut in the key. Pin tumblers
usually consist of bottom pins, top pins and
master pins.
Bottom Pins Usually a cylindrical shaped tumbler which is
often flat on both ends and is installed directly
under a coil spring in the spring stack.
To p Pi ns Usually a cylindrical shaped tumbler which is
often bullet shaped and comes in a variety of
lengths that correspond to the depth of the cut
of notch in the key.
Master Pin Usually a cylindrical shaped tumbler which is
often flat on both ends, placed between the top
and bottom pin to create an additional shear
line.
Rose A circular trim plate attached to the door under
the knob or lever.
Shear Line The area where the top surface of the plug and
cylinder housing meet. the height which the
bottom pins must be raised by the key in order
to rotate the key cylinder.
Spindle Bar which connect knobs or levers through
door and operates lock mechanism.
Trim Decorative as well as functional components of
a lockset, including knob, lever, rose, etc.
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Dexter Rekey MR1191.qxd 7/11/06 1:54 PM Page 21
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