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A mortice lock is therefore less vulnerable to ram or forced attack than a surface mounted lock. Whenever possible try to fit mortice locks that are certified to BS3621 and which can be identified by the British Standard Kitemark symbol. Mortice locks are available with a 2, 3, 5 or 7 lever mechanism. The higher the number of "levers" the more difficult the lock is to "pick". For front, side and back doors it is recommended that British Standard 5 or 7 lever locks are fitted. Mortice locks are available in a range of different case sizes. The case size is the measurement between the faceplace and the back of the lock as measured in millimetres (typically 54mm, 67mm or 80mm). The case size measurement therefore denotes the depth of the mortice slot in the door.

•3G114

The 3G114 is the most popular 5 lever mortice deadlock in the Chubb range offering excellent security protection for front doors

•3K74

Offers the same design and security specification as the 3G114 but incorporates a two bolt locking feature with a deadlocking main bolt and a roller bolt providing latch operation. Door handles will be required which are available separately.

•3G220

Similar in specification to the 3G114, the 3G220 is a narrow style 5 lever lock designed for doors with a restricted stile width, particularly glazed doors and French windows.

7 Lever mortice locks provide the best security protection for wooden doors, particularly front doors. Their robust construction provides a high level of protection against all common forms of force attack and the 7 lever mechanism generates 6,000 key variations

•3G117

This 7 lever mortice deadlock lock is ideally suited for wooden front doors and with the 3K77 represents the very top of the Chubb lever mortice lock range.

•3G115

A rugged, quality 5 lever lock ideally suited for wooden front doors or side entrance.

•3K75

An effective two bolt 5 lever mortice lock with deadlocking and latch operation. Ideally suited for side and back wooden doors. Handles will be required which are available separately.