Simplex 266-005 — the door cam lock used on Simplex fire alarm control panel doors, keyed to the Simplex B key.A cam lock is the barrel that passes through the door skin with a flat metal tongue, the cam, on the back. Turn the key and the cam swings behind the lip of the back box to hold the door shut. Simplex carries this lock as a service line item across several panel generations rather than as a catalog product. Listed as Cam Lock, Door in the 4006 Fire Alarm Control Panel Parts List 579-713 Rev. A Listed the same way in the 4008 Fire Alarm Control Panel Parts List 579-719 Rev. A Listed as B Cam Lock under Hardware in the 4100U Service Parts List Keyed to the Simplex 252-019 B key, a separate part number not supplied with the lock Retained by the Simplex 266-072 Retaining Clip for Cam Lock, also a separate part number On the 4006 and 4008, door assemblies 743-564 and 743-571 already include the lock The trap is the plastic door. For 4100ES plastic and glass doors Simplex specifies 266-085, the B Cam Lock for Plastic door, not this one. Order the 266-072 clip and 252-019 key separately.