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CYLINDERS, KEYS AND KEY CONTROL
P
R
IMUS
D
O
N
O
T
D
U
P
L
IC
A
T
E
P
A
T
.
N
O
.
4
,
7
5
6
,
1
7
7
Full Size Cylinders
and Cores
Small Format
Interchangeable Core
Conventional
(Non-Primus)
Conventional
(Non-Primus)
CLASSIC
Keyways
Patented
Undercut
Groove
Keyways
(Best Style)
High Security &
Geographical
Exclusivity
Levels 1 - 4
Classic
Primus
P
a
t. 5
,8
0
9
,8
1
6
PRIMU
S
US
D
O
N
O
T
D
U
P
L
IC
A
T
E
Levels 7 - 9
Everest
Primus
PAT.
5
,
7
1
5
,
7
1
7
5,715,717
Everest
Conventional
Everest
Conventional
Best
®
Compatible
Classic
Conventional
PAT.
5
,
7
1
5
,
7
1
7
5,715,717
Keyway Type
Mechanism Key ControlCylinder Category
D
U
P
L
IC
A
T
IO
N
P
R
O
H
IB
IT
E
D
Open and
Restricted
Keyways
Open and
Restricted
Keyways
Adds Patented
Restricted
Duplication
Even to
Open Keyways
Over the last few years Schlage has introduced a varietyof new keyways
and cylinder types. This chart illustrates our cylinder terms and how they are
related. The definitions below provide additional information.
Keyways
Everest
Cylinders and keys which incorporate all new
keyways with the patented undercut groove on the
right side of the key section. C Family is the name
of the open family of keyways. B Family (for SFIC) and
D Family keyways are restricted.
Classic
Schlage pin tumbler keyways which existed before
Everest keyways. Obverse is the name of the open
family of keyways (C, E, etc.) and there are three
other families of restricted keyways: Reverse, Numbered
and Quad.
Opposing
Terms
Cylinder Mechanisms
Primus Cylinders
SchlageÕs high security sidebar cylinder mechanism.
Patented key control, geographical exclusivity, and
pick resistance are standard. UL437 drill resistance
isoptional. Primus keys operate conventional
cylinders.
Conventional Cylinders
Normal, standard cylinders.
Opposing
Terms
Key Control
Restricted Keyways
Special non-stock keyways set aside for limited use
and a higher degree of key control. A letter of
authorization from the end user is required to
process orders for keys, blanks and cylinders.
Open Keyways
Standard keyways available without any ordering
formalities. C Family (Everest Conventional) and
Obverse (Classic Conventional) keyways are open.
All others are restricted.
Opposing
Terms
Cylinder Category
Small Format Interchangeable Core (SFIC)
A core completely interchangeable with Best, Falcon,
etc. No Primus version exists. Pins, springs, keys and
keyways are based on a plug diameter smaller than the
standard 1/2
ý
.
Full Size
Pertaining to cylinders (including interchangeable cores),
keys and keyways based on the industrystandard plug
diameter of about 1/2ý.
Opposing
Terms
Schlage Cylinder Terminology