TM 5-805-8
9. KEYING
complex having a common operational requirement,
consideration may be given to integrating the added
a. Lock Security.
keying system with that of the existing system where so
(1) Design of Lock Cylinders. Lock cylinders
requested by the Using Service. However, proprietary
usually are designed for six or seven pins. Normally, the
keying systems must not be specified without adequate
six-pin cylinder will be used in general-purpose
justification. The justification must provide logical
construction; the seven-pin cylinder is used in more
reasons why a proprietary system is necessary and why
complicated master-keying Systems. Removable cores
the particular system named is properly the one which
will be specified only where frequent key changes are
should be specified.
c. Construction Master Keys. Instead of the normal
required for security reasons.
(2) Selection of Keying System. Since non-
procedures for having the construction Contractor tag the
masterkeyed locks offer more security against picking, it
keys and deliver them to the Contracting Officer, a con-
is desirable to key locks alike whenever possible rather
struction master key may be specified. With this system,
than to master key. However, few projects, particularly of
the Contractor will be able to use one key on all the locks
a complex nature, lend themselves to a nonmasterkeyed
during construction, but after acceptance of the work the
system. Where masterkeyed buildings are required, the
construction master key will no longer operate the locks.
form that is simplest and most practical is that in which
When construction master keys are specified, the
one master key will operate all locks in the building
specification will also provide that the lock manufacturer
system.
send permanent keys directly to the Contracting Officer
(3) Nonmasterkeyed
Cylinders.
In
a
by registered mall or other approved means.
nonmasterkeyed cylinder, the regular (change) key
10. Door-closing devices
operates the cylinder by having bittings (cuts or
indentations) which aline the pin tumblers with the
drivers (follower pins), and permit rotation of the cylinder
Door-closing devices shall conform to BHMA A156.4.
plug to actuate the locking mechanism.
Door closers on high frequency and exterior doors will be
(4) Masterkeyed Cylinders. Lock cylinders are
grade 1. Closers should not be on the outside face of the
masterkeyed by several methods; the most common
building because of the adverse effect of the weather, main-
method is to split one or more pin tumblers into three
tenance of the oil, and vandalism. Closers on exterior
sections in lieu of the standard two sections employed in
doors will have the back check feature to prevent damage
the nonmasterkeyed cylinder. With the pins split into
to door and frame during high wind conditions. Other
three sections, it is possible to make key bittings in such
options available are delayed action, dead stop, fully
a manner that one key will raise the pins to a different
adjustable and power adjustment plus 15%, 35% or 50%.
a. Automatic Door Closers. Automatic door closers
position which will also allow the plug to rotate.
b. Masterkeyed Systems. Master keyed systems will
are expensive to acquire and maintain. Two types of door
be developed in conjunction with the Using Service to
closing devices are adequate for most general purpose
meet the operational requirements of the facility. Keying
construction: the surface-type closer and the checking
information should be obtained from the using agency in
floor hinge. In selecting the closers, consideration should
time to be inserted in the keying schedule of the contract
be given to the wind or draft conditions, as well as the
specifications. Keyset symbols should be set up for exist-
weight and construction of the door, frequency of use,
ing work in the event some new work is to be tied in with
and the need for a barrier-free opening. (For example,
existing systems.
doors and closers for facilities such as chapels,
(1) New Systems at New Facilities. Masterkeying
schoolrooms, child development centers, and medical
systems at new facilities will be the standard system of
buildings should be selected considering that women,
the manufacturer of the lockets furnished under open
children, and handicapped persons frequently use such
competition. No restrictions will be placed on the type of
doors.)
b. Parallel Arm Closers. Parallel arm closers will be
system selected for installation at new facilities.
(2) New Systems at Existing Facilities. Where a
used when there is not enough space for a door with
major self-contained building or group of buildings, such
regular arm closer to be opened 90 degrees without the
as a hospital, a family housing group, or other groups of
closer striking the adjacent surface. Regular arm closers
geographically isolated buildings are proposed, the
should not be mounted on corner brackets. Minimum
masterkeying system will be established on a competitive
distance from floor to bottom of closer tor corner bracket]
bid basis as set forth for new systems at new facilities,
will be not less than 6 feet, 8 inches.
c. Manual Hold-Open Mechanisms. The hold-open
except that where required for simplification of custodial
operations, lockets for utilities buildings or rooms may be
feature on a door closer is designed to hold the door open
masterkeyed into the existing utilities masterkeying
within a normal range of 90 to 135 degrees, but can be
system.
used for a full opening of 180 degrees when specified. A
(3) Additions to Existing Systems. Where
door stop should be used when using a hold-open
additions to existing buildings are proposed or where new
mechanism. The holder arm is frequently used instead of
construction is being integrated into an existing building
a floor door holder, particularly where the latter would
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