David Bolton No Cylinder Override on a Fail Safe Mortise Lock: Why Some Access Control Openings Are Designed to Lock Out the Key What This Article Covers This guide explains a specific and often misunderstood configuration in electrified mortise lock specifications: the fail safe function where both levers are locked and no cyl... access control commercial door security electrified mortise locks fail safe hardware no cylinder override Oct 31, 2026 Our Blog