Formerly known as the Chubb 4L67, the Union 4L67E C-Series is a British Standard certified rim lock offering one of the highest levels of mechanical door security available. Recommended by insurance providers and police forces, this lock is ideally suited for front entrance doors where certified, heavy-duty protection is essential.
This model features a 20mm hardened steel deadbolt that automatically deadlocks both internally and externally when the door is closed. It offers true key control, with a secure 10-disc Ava mechanism cylinder and robust resistance to all forms of physical attack including sawing, drilling, and torqueing.
The inside knob is also key-lockable for additional safety, and the unit is fully compliant with BS3621: British Standard for high-security locks.
