Engineering and Expeditionary Warfare Center

S&G 2740B Mounted Lock (FF-L-2740B)

 

S&G 2740B Mounted Electromechanical Combination Lock   

 

The Sargent & Greenleaf Model 2740B electromechanical combination lock has been approved under Federal Specification FF-L-2740B, Locks, Combination, Electromechanical.  The S&G Model 2740B lock is available from the DLA Troop Support and GSA Global Supply.  See the Ordering Information page for information on how to procure this lock.  The two main differences between the S&G Model 2740B lock and its predecessor are that the S&G Model 2740B lock does not use a setup module, and you only have to make one revolution between each number when dialing the combination (there is a "111" sticker on the lock to remind users).  You can visit Sargent & Greenleaf's Model 2740B web page for more information about this lock.  When properly disposing of this lock, it shall be sent to the DoD Lock Program, see our Combination Lock Support page for disposal instructions.

Click here for S&G 2740B Installation Instructions

Click here for S&G 2740B Operating Instructions

Video instruction for the operation of S&G 2740B Locks  (CDSE site)

Video instruction for changing the combination of S&G 2740B Locks  (CDSE site)

 
 

This lock is powered by a main battery (CR123A lithium camera-type), and also houses a long-life backup battery (CR2450 coin cell).  Both batteries are on the underside of the lock cover.


Click on image to see enlarged view.



The dialing sequence of the S&G Model 2740B lock is left-right-left-right, but unlike the S&G 2740 lock, it only requires one revolution between each number.  However, the dial can be rotated more than one revolution for entry of any combination number in case you overshoot the desired number.



 
 

S&G 2740 Mounted Combination Lock   

The Sargent & Greenleaf Model 2740 electromechanical combination lock was approved under Federal Specification FF-L-2740A, Locks, Combination, Electromechanical.  This lock was also known as the "S&G 2740A lock".  The S&G Model 2740 was only available through a Sargent & Greenleaf distributor, and never was available from the DLA Troop Support or GSA Global Supply.  This section is presented only for technical support purposes.  When disposing of this lock, it can be sent to the DoD Lock Program, see our Combination Lock Support page for disposal instructions.

 

Click on image to see enlarged view.



This lock is powered by a main battery (CR123A lithium camera-type), and also houses a long-life backup battery (CR2450 coin cell).  Both batteries are on the underside of the lock cover.


Click on image to see enlarged view.



Operation of the S&G Model 2740 lock is much like the operation of their S&G 2937 mechnical lock.  The dialing sequence is left-right-left-right, with at least four complete revolutions to the first number, stopping on the third rotation on the second number, and stopping the second rotation on the third number.  However, unlike the mechanical lock, the dial can be rotated more than the minimum number of rotations for entry of any combination number in case you overshoot the desired combination number.

S&G 2740 Operating Instructions Manual

S&G 2740 Installation Instructions Manual

S&G 2740 Misaligned Dial Ring Recovery Instructions Manual

Video instruction for changing the combination of S&G 2740 Locks  (CDSE site)

Video instruction for the operation of S&G 2740 Locks  (CDSE site)

 

A setup module is used to calibrate, program, and troubleshoot the S&G 2740.  Only a properly trained technician should connect a setup module to your lock.  A single module may be used on any number of locks.



Photo of SG 2740 Lock Setup Module

Click on image to see enlarged view.


 

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