Allegion Schlage D Series, Manual

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10 • Schlage • Primus service manual
Cam and tailpiece differences
Cam and tailpiece differences
Prior to April 2010, the cams and tailpieces used in the
Primus/Primus XP cylinders were different than
conventional cams and tailpieces because of the location of
the sidebar and finger pins.
The illustrations below are rear views of the mortise cylinder
as well as the key-in-knob/key-in-lever cylinders showing the
differences in screw and cap pin locations. All Everest 29
keyway cylinders use the Primus/Primus XP screw and cap
pin location.
Traditional cylinders
(prior to July 2010)
Conventional Classic Primus & Everest 29
Modular cylinders
Mortise
KIK, KIL, Everest 29, Primus, &
Classic
Full size interchangeable core
(FSIC)
Schlage introduced its Full Size Interchangeable Core (FSIC)
in 1984. Like the key-in-knob/key-in-lever
cylinders, the core uses a cap pin and spring
mechanism, but the cap pin also serves to drive the cam or
tailpiece.
Housings and tailpieces manufactured before the Primus
core was introduced only had clearance for the conventional
cap pin. Now, all FSIC housings and tailpieces are made to
accommodate both cap pin locations.
Current Design Pre-1992
UL437
Each Schlage cylinder is available in a standard
configuration as well as with a UL437 option. The catalog
numbers associated with a standard cylinder are 20-7XX
while the catalog numbers associated with the UL437
cylinder are 20-5XX.
The UL437 Primus/Primus XP cylinders incorporate drill
resistant components for additional security.
Modular cylinder note:
With the introduction of the Modular Cylinder, the cap pin &
spring location was moved to the upper right when viewed
from the rear. Additionally, the cam attachment types were
standardized to a single screw attachment. Cams are
available to fit multiple manufacturers’ lock designs and are
separated by increments. One cam covers 1/8” , 3/8”, and
5/8”, and the other cam is designed for 1/4”, 1/2”, and 3/4”
increments.