FF-L-2937
AMENDMENT I
May 22,2006
FEDERAL SPECIFICATION
COMBINATION LOCK. MECHANICAL
The General Services Administration has authorized the use of this
amendment, which forms a pari of FF-L-2937, dated January 31,
2005, by all federal agencies.
Page 4
Paragraph 3.6, delete in its entirety and substitute the following:
“3.6 Thermal oDeration. ,The lock shall operate properly up to a
temperature of 155 degrees Fahrenheit. The lock is not required to
operate at temperatures exceeding 155 degrees Fahrenheit. The lock bolt
shall not be able to be retracted without the proper combination when
exposed to extreme heat. The lock shall be tested in accordance with
paragraph 4.7.2.”
Page 5
Add new paragraphs, asfollows:
3.13.1 Bolt Material. The lock bolt shall be made of Type 304 stainless steel or
equal material that is corrosion resistant, has a minimum tensile strength
of ’65,000 psi, and a hardness of Rockwell B85.
3.13.2 Bolt Desian. The locking bolt shall have two threaded holes in the end of
the bolt. The holes shall be #l O-32 UNF with a center to center distance
of ,0.56310.005 inch. The holes shall be tapped to a minimum depth of
0.375 inch (see figure 4).
Page 8
Paragraph 4.7.2, delete in its entirety and substitute the following:
“4.7.2 Thermal test. The’ lock shall be placed in a chamber maintained at a
temperature of 155 degrees Fahrenheit for a period of three hours. At the end of
that period, the lock shall,,be removed from the chamber and immediately opened
five times using normal dialing procedures. Failure of the lock to operate shall
constitute failure. The lock shall then be subjected to extreme heat and an
attempt shall be made to retract the locking bolt without using the proper
combination. Retraction of the lock bolt without entering the proper combination
shall constitute a failure.”
FSC 5340
Downloaded from http://www.everyspec.com
