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Disengagement of Top Pins and Springs
Using follower bar
groove as a guide,
push pin into its
chamber against spring
pressure with flat edge
of tweezers or small
flat blade screwdriver.
3
Install spring into
back chamber and
balance top pin (#3)
on top of spring.
2
Insert square
notched end of
follower bar into
cylinder shell
from rear.
1
Repeat until all
chambers are loaded.
5
Slide follower bar
forward to hold pin
and spring in place.
4
Glossary of Terms
7.37.2
ANSI American National Standards Institute.
backset The distance from the edge of door to the center line of prep.
bottom pin A bullet-shaped tumbler that comes in a variety of lengths that correspond to
the depths of the key cuts.
chassis The body of the lock itself, without any trim.
cylinder The portion of a lock comprised of the plug, shell, pins (tumblers) and
springs. A properly cut key allows the plug to rotate the tailpiece or drive
mechanism which unlocks the lock.
hand The direction a door swings, always referenced from the outside.
housing A larger portion of some cylinder assemblies which encases the cylinder (plug
and shell).
latchbolt A spring operated bolt with a beveled face to permit latching action when
door closes.
master pin A cylindrical-shaped tumbler which is flat on both ends, placed between the
top and bottom pin to create an additional shear line.
pin tumbler Today’s standard tumbler mechanism consists of a series of bottom pin,
mechanism top pin and spring for each cut (notch) of the key.
pin tumblers Small sliding pins in a lock cylinder that work against coil springs. They
prevent the cylinder plug from rotating unless all are aligned simultaneously
by cuts of the proper depths in the key.
plug The portion of a cylinder which contains the keyway and rotates with the key.
rose A circular trim plate attached to the door under the knob or lever.
shear line The area where the top surface of the cylinder plug and inside surface of the
shell meet, and the height to which the bottom pins must be raised by the
key in order to rotate the plug.
shell The portion of the cylinder immediately surrounding the plug.
strike The metal plate recessed in the frame that receives latch or bolt when the
door is closed.
top pin A cylindrical-shaped tumbler which is flat on both ends and is installed
directly under a coil spring in its chamber.
tailpiece A usually flat actuator which extends from the back of the cylinder plug and
engages in the lock to operate the latch or bolt.
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