<p>A lock cylinder (1) suitable for mortise locks comprises mechanically operating tumbler pins (19) controlled by a key (15) and at least one electromagnetic tumbler (20). The cylinder is arranged in a cylinder casing (24) and comprises a coil (21) as well as a locking member (33) which can be displaced by electromagnetic forces for an additional tumbler pin (23) which is spring-loaded in the locking direction and with a reading device which detects a key code. The locking member (33) is pivotally mounted in a recess (32) in the additional tumbler pin (23) and enters the locking position in front of a stop (38 min ) on the cylinder casing.</p>
