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Combination Lock Glossary
Model 6730, 6735, 6738, 6741 Mechanical Combination Lock
COVER SCREW:
machine screws
used to attach the cover to lock case;
typically 8-32.
COVER:
the cover for the lock case;
the wheel post is attached to or cast
as a part of some model covers (6650
& 6709 – both obsolete).
LOCK CASE:
the housing into
which all component parts are
installed or attached; the case casting includes several important
bearing surfaces and features.
MOUNTING SCREW:
safe door; typically 1/4 X 20 size.
TUBE:
surrounds and protects the spindle from insulation,
etc., and is pressed onto the tube horn; the tube connects and
coordinates the dial ring with the case
and components of the lock.
TUBE HORN:
a cast feature of the
case to which the tube is attached (not
used in all locks).
TUBE NUT:
a hexagon nut used to attach the dial
ring to the tube (not current production).
DIAL:
the component which allows a user
to position the wheels of the lock and oper-
ate the bolt when proper wheel alignment is
achieved; each division on the dial represents
a possible combination setting for
each wheel.
KEY LOCKING DIAL:
locked with a key to prevent rotation.
© Copyright 2006, Sargent & Greenleaf, Inc.
used to attach the lock to a
a dial that can be
OPENING INDEX:
the index on the dial ring used when dial-
ing the combination to open the lock; commonly referred to as
the "crows foot".
CHANGING INDEX:
the index on the dial ring used when
changing the combination; on S&G locks, it is 8 1/2 numbers
to the left of the opening index.
L.O.B.C. INDEX:
L.O.B.C. means
the lock cover is "Locked On By
Combination"; the opening combina-
tion must be dialed to this index to
remove the lock cover and/or change
the combination.
DIAL RING BEARING:
a plastic component which fits into
a depression in the center of a dial ring;
it acts as a bearing surface for the dial.
KEY LOCKING
DIAL RING:
dial ring containing a key lock, which
throws a bolt into the underside of the
dial to prevent rotation.
SPY PROOF
DIAL & RING:
restricts unau-
thorized observation while dialing the
combination (as opposed to a front-
reading dial and ring).
DUST COVER:
clear plastic shield to keep fingerprints off
the dial and dial ring so that fingerprint
segments cannot later be realigned and the
numbers of the combination be discovered;
at one time, it was required on all G.S.A.-
approved security containers.
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