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[INCH-POUND]
FF-L-2740B
June 15, 2011
SUPERSEDING
FF-L-2740A
January 12, 1997
FEDERAL SPECIFICATION
LOCKS, COMBINATION, ELECTROMECHANICAL
The General Services Administration has authorized the use of this federal specification by all federal
agencies.
1. SCOPE
1.1 Scope
. The purpose of this document is to describe the U.S. Government’s requirements and
expectations for a combination lock designed and manufactured specifically to protect unattended national
security information (NSI). Combination locks approved under this specification will be used on new and
existing General Services Administration (GSA) approved security containers, vault doors and pedestrian
door deadbolts. These combination locks should incorporate modern electronic security techniques. The
collective power of the Internet has created an increase in the number and sophistication of computer and
electronic system hacking techniques. The new generation of electromechanical combination locks uses
microprocessors with software codes that can be manipulated during manufacture and transportation.
Security features designed to ensure the code has not been altered during manufacture and transportation
are required. The vulnerabilities of the new coding techniques mandates the development of new security
requirements on the manufacturers to ensure the electronic components and software are adequately
protected and are accessed only by personnel subject to U.S. law.
1.1.1 Limited use
. Locks tested and qualified under this specification are to be sold only to the Federal
Government, Government contractors specifically authorized to purchase these locks, or other organizations
or persons specifically authorized or required by the Government to use these locks.
1.2 Styles.
1.2.1 Style 1: Basic self-contained
1.2.1.1 Power source. The power source for a microprocessor based electromechanical lock shall be
contained within and integral with the lock body or dial ring assembly. The power source shall be self-
generating and must provide power to operate the lock for its intended lifecycle.
1.2.1.2 Peripheral devices
. There shall be no external data transfer port or ability to transfer data to or from a
secondary device. Keys or special tools required for combination changes shall not be able to communicate
with the lock’s microprocessor or electronic circuitry. These special keys or tools shall not have any
memory-holding capability or signal processing ability.
1.2.2 Style 2: Interoperable / networked
1.2.2.1 Power source. The power source for a microprocessor based electromechanical lock may be
contained within and integral with the lock body or dial ring assembly. The power source may be replaceable
and available in the open market.
1.2.2.2 Peripheral devices
. External data transfers to secondary devices shall meet applicable FIPS
Standards. These devices may be used to monitor authorized/unauthorized openings, personnel access,
combination verifications, combination changes, etc. These secondary devices shall not be able to open the
electromechanical lock.
FSC 5340
Beneficial comments, recommendations, additions, deletions, clarifications, etc. and any data which may
improve this document should be sent to: General Services Administration, Federal Supply Service, National
Furniture Center, Engineering Division, Washington, DC 20406.
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