3G222 Mk3


To provide secure deadlocking of swinging doors or gates where a superior level of security is necessary. This lock is specifically designed for very high use applications; typically securing internal doors and main access routes.

The 3G222 magnetic lock affords a higher level of security due to the inability to sight read keys. The magnetic key code is impossible to read or duplicate using normal human senses alone or duplicate with standard workshop equipment.


The 3G222 Mark 3 is a mortice deadlock of robust construction based on the Chubb Locks Custodial Services small mortice footprint.

The mechanical deadbolt provides a throw of 20mm. The lock provides deadlocking operated by a unique key profile to the single action range of locks and will not operate double action lock variants. The lock is operable from both sides and the escutcheon is designed to allow only the correct key profile being inserted into the lock.

Secure locking is achieved as follows:

Locking is achieved by inserting the pass key into the keyhole and turning the key through 90¼ in an anti-clockwise direction. The bolt is then thrown by turning the handle to its fully extended position.

Unlocking is achieved by inserting the pass key into the keyhole and turning through 90¼ in an anti-clockwise direction. The bolt is then withdrawn by turning the handle.


Steel deadbolt, with carbide anti-cutting rollers and 20mm throw.
Unique magnetic locking system.
Locking arrangement designed to provide extended product life. 
Reinforcing plates to provide added strength.
Anti-tamper device to prevent unauthorised removal.
Dedicated key profile operates single action magnetic locks only.
Escutcheon designed to give positive key alignment.
Security fixings to prevent unauthorised removal.


Lock tested to a minimum of 500,000 key operations.
Handle and follower assembly tested to 1,000,000 operations.

Additional features

Suitable for external and internal use.
Range of fixings including reinforcing plates and locking plates.
Available in alternative furniture finishes on request.
Can be keyed with 3M222 Hook Bolt.
Gate boxes for steel door applications recommended.
Rebate kit available for wooden door applications.
Monitored versions available with micro-switch sensing of bolt position.
Single sided version available on request.

Materials and finishes

Lock case - carbon steel electro-plated.
Bolt – carbon steel electro plated.
Escutcheons – brass
Keys – brass
Locking barrels – brass and stainless steel.

Dimensions and Weights

Lockcase Depth (total) 171.5mm
Lockcase Length 114.2mm
Lockcase Width 21.5mm

Weight (lock only) 6.25kg

Total Range

The lock is not handed, however for use on steel doors the short forend version should be ordered and for wooden doors the long forend version is recommended.

NOTE: CLCS recommend this lock is used in conjunction with a wooden door 54mm thick. Please contact CLCS for guidance if alternative wooden door thicknesses are required.

Fully dimensioned customer drawings are available on request to assist with door preparation.