S&G 6804

From Lockwiki
Jump to navigationJump to search

Sargent & Greenleaf 6800

Sargent & Greenleaf 6800
SG6804 lock.jpg
Name Sargent & Greenleaf 6800
Manufacturer Sargent & Greenleaf
Lock Type Safe
Lock Design Lever
Patent US 4,462,230
# of Components 7
Component Type Lever
Related Locks
S&G 4500

The 6804 (or 6805, 6824, 6825) is a user-rekeyable lever lock made by Sargent & Greenleaf. It is one of the few keyed safe locks made by Sargent & Greenleaf, and one of the few lever locks that can be rekeyed without disassembly of the lock mechanism.

The 6800 series is based heavily on the S&G 4500 safe deposit box lock.

Principles of operation

The 6800 series of locks use seven levers which interface with stumps set at various heights. Unlike traditional lever locks, the bellies, true gates, and false gates are identical on all levers. Differing in the 6800 series is provided by varied positions of the stumps, which can be set to many positions, though factory keying recognizes six positions for the 6804/6824 and eight positions for the 6805/6825. This allows 279,936 (67) theoretical key differs in the 6804/6824, and 2,097,152 (87) in the 6805/6825.

Levers themselves have one true gate and three false gates. All levers have identical conning on their bellies to facilitate proper operation of the key and protect against various forms of decoding. Levers also have an enclosed belly to prevent access to other parts of the lock. The stumps are L shaped pieces of brass to the left of the levers. Stumps are set at different heights to provide differing. When the key is changed, stumps are loosened from their position and allowed to slide to conform to the new key's bitting.

The key itself has fourteen bitting positions, with cut 14 being at the tip of the key. Positions 13 and 14 engage the drive disc which grabs the bolt talon to retract the bolt. Positions 3-9 are bitting positions that interact with the levers. Positions 1, 2, 10, 11, and 12 are not used.[1]

Model variations

There are several models of the 6800, differing on whether they are key-retaining and the number of bitting surfaces:[2]

  • 6804: Key retaining, single bitted
  • 6824: Key retaining, double bitted
  • 6805: Non-key retaining, single bitted
  • 6825: Non-key retaining, double bitted

Key change instructions

  1. Insert working key and rotate clockwise.
  2. Turn the fence clamp screw on the back of the lock four times counterclockwise with the change wrench.
  3. Rotate the working key clockwise and remove it.
  4. Insert new key and rotate counterclockwise until it stops.
  5. Tighten the fence clamp screw four times clockwise.
  6. Rotate key counterclockwise and remove the key.
  7. Test the new key.
  1. Insert working key and rotate 180° clockwise then remove the key. Single bitted keys (6805) should be inserted with key bitting facing the bolt.
  2. Turn the fence clamp screw on the back of the lock four times counterclockwise with the change wrench.
  3. Insert the new key
  4. Tighten the fence clamp screw four times clockwise.
  5. Rotate key counterclockwise and remove the key.
  6. Test the new key.

Disassembly instructions

The 6800 series are easy to disassemble. Simply remove the casing screws from the back of the lock and remove the components. Because all levers are identical there is no need to preserve their order. Note that breaking the seal on the back cover of the lock may void manufacturer or distributor warranty.


The 6804 may be vulnerable to one or more of the following:


Add to me!


  1. PULFORD, Graham (2007). High Security Mechanical Locks: An Encyclopedic Reference. ISBN 0750684372.
  2. Key Operated Locks: 6804/6805/6824/6825
  3. Key Op Models: 6804 and 6824. Operating Instructions.
  4. Setting Key-Op Models 6805 and 6825 to New Keys.

See also