What is a Dimple Key?
Round dimples instead of edge notches
A dimple key is a flat key whose code is drilled as small, round dimples into its flat faces, and sometimes its edges, instead of being cut as notches along the top edge like an ordinary key. The lock it opens is a dimple lock: a pin-tumbler lock in which the key's bitting is on the side of the key rather than the top.
The dimples are drilled at different depths, and on many designs at different angles, so each key has its own pattern. Many dimple keys are reversible: with dimples on both faces, the key works either way up.
Dimple systems are used by European lock makers such as LIPS and DOM in high-security cylinders, padlocks and master-key systems.
Dimple Key at a glance
- Typical security: High
- Code location: Drilled dimples on the faces (and sometimes the edge)
- Reversible: Often, but not always
- Blank: Flat, with a milled profile
- Cut with: Dimple key machine (tracer and drilling cutter)
- Security: High
- Common in: High-security cylinders, padlocks, master-key systems
Inside the lock
How does it work?
Pins read the faces
A standard key lifts one row of pins from above. A dimple lock has several rows of pins that touch the flat faces of the blade. Some designs, such as the LIPS Octro, read the thin edge with one set of pins and the faces with others.
Each dimple sets a pin depth
The depth of each dimple decides how far its pin can move. Only the correct pattern lines every pin up so that the plug can turn.
Extra control pins
Some systems add passive control pins that check for additional dimples. If a dimple is missing, its pin pushes out and blocks the plug.
A profile only the right blank fits
The thin, flat blade is milled to a specific profile, so only the matching blank will enter the keyway. This limits who can easily obtain blanks.
In the workshop
How is a dimple key cut?
An ordinary edge-cutting key machine cannot copy a dimple key. It needs a machine built for the job.
Start with the right blank
A dimple key begins as a flat, uncut blank with the correct milled profile. It must match the lock's keyway, so identifying the key system comes first.
Drill the dimples
On a dimple key machine, a fine cutter drills each dimple to its exact depth and position. On a duplicating machine, a spring-loaded tracer reads each dimple on the original key while the cutter reproduces it on the blank.
Cut by code
Without the original, a key can be cut by code on a computerised machine. Advanced machines turn the blade automatically so that every face is cut.
Check the result
The finished key is checked against the original or the lock and tried for smooth, reliable turning.
Uses
Where you will find it
High-security cylinders for front doors
Padlocks
Master-key systems in offices and larger buildings
Commercial and industrial premises
The honest picture
Good to know
Strengths
- Cannot be copied on an ordinary edge-cutting machine
- Many keys are reversible, so there is no wrong way up
- Several rows of pins allow a large number of key combinations
- Suits master-key systems
Worth knowing
- Special machines and blanks mean copies cost more than a standard key
- Not every key cutter has the equipment, so ask before you go
- Systems differ between manufacturers, and their blanks are not interchangeable
Security ratings
- Security ratings belong to the specific cylinder, not to the key style. Look for BS EN 1303, TS 007 or Sold Secure marks on the product itself
F.A.Q
Frequently asked questions
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Can a dimple key be copied?
Yes, but only on a machine built for dimple keys, using the correct blank. It cannot be done on a standard edge-cutting machine.
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Is a dimple key the same as a laser key?
No, although they are often confused. A dimple key has drilled round dimples; a laser (sidewinder) key has a groove milled along its flat face. Both are called high-security and both need special machines, but the cutting, the blanks and the locks are different.
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Why is a dimple key more secure?
Its code is spread across the faces, read by several rows of pins, and the blanks and machines are specialised. That makes it harder to copy casually and gives the lock more combinations.
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Can I use it either way up?
Many dimple keys are reversible, but check yours. Some designs only work one way.
Quote
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