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Section 2:
Combination Locks.  A combination lock is any lock that requires the
use of one or more movable lettered or numbered dials to align the lock
components to open the lock.  Mounted combination locks are those attached
with screws or bolts to the container, door, or equipment that the locks
secure.  Combination padlocks are removable from the container or equipment
that the locks secure.
Combination locks have many components that interrelate with each
other.  The wheels are the components inside the lock that must be aligned
correctly to open the lock.  On mounted combination locks and many combination
padlocks, the dial is the movable metal or plastic part on the front of the
lock used to turn the wheels.  The wheels, spacers, and washers constitute the
wheel pack.  The internal components of the lock are housed in the lock case.
On a mounted lock, a dial ring and dial are on the front of the door or drawer
head between the dial and the lock case.  The bolt projects from the case and
prevents the door or drawer from opening.
Group 1 and 1R Locks.  The Group 1 and 1R locks addressed in this
handbook meet the requirements of MIL-L-15596 Series, Locks, Combination (Safe
and Safe Locker).  Group 1 locks have brass wheels, whereas Group 1R locks
have X-ray proof (Delrin) wheels.  Each lock has a thermal relock device for
protection against forced entry using thermal devices.  These locks, along
with the Sargent & Greenleaf R6700 Series (Group 2), have a special relocking
trigger for protection against punching of the spindle.  If an attempt at
penetration is made through either of the above-mentioned means, the trigger
will automatically deadlock the unit.
Mounted Combination Locks.  Each mounted combination lock is
available with either a front-reading dial or top-reading ("spy proof") dial.
The top-reading dial permits only the person dialing the combination to see
the numbers involved.  Each lock is furnished with a spindle that can be cut
to suit varying thicknesses of doors or drawers.  The spindles and drive cams
are designed to allow the locks to be mounted in the right-hand, left-hand,
vertical-up, or vertical-down positions.
General Operating Guidelines.  When operating combination locks or
setting combinations, always observe the following rules:
a)  Never spin or jerk the dial.  Always turn the dial slowly and
evenly, stopping exactly on each number of the combination.
b) Passing a combination number requires restarting the entire
combination sequence from the beginning.
c)  Never use force.  If a lock fails to operate or operates with
difficulty, request assistance from a qualified locksmith.


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