A rekeyable lock cylinder with a cylinder body, an inner sleeve, and a plug assembly is provided. The plug assembly includes a plurality of key followers and a corresponding plurality of first racks and second racks disposed in carriers. The first racks correspond to operation of a user key and the second racks correspond to operation of a master key. As such, the lock cylinder is usable in a user/master key system. Disengaging either of the first or second racks from the key followers allows rekeying of the lock cylinder for the user key or the master key.

Embodiments of a cylinder lock include a main body component and an extension component, wherein a locking arrangement can be employed to move a locking element at the back of the extension component to lock or unlock the extension component from a lock structure. Embodiments of the present disclosure further provide a cylinder lock with a lock adapter having a body and a biased catching mechanism operable to fit within the body near a back end of the lock adapter when in the retracted position and further operable to extend outwardly of the lock adapter body when in the extended position. The catching mechanism can be biased in the extended position and movable to the retracted position by a plunger. The plunger can be moved manually and can be locked in position using a lock such as a padlock with a shackle.

Embodiments of a cylinder lock include a main body component and an extension component, wherein a locking arrangement can be employed to move a locking element at the back of the extension component to lock or unlock the extension component from a lock structure. Embodiments of the present disclosure further provide a cylinder lock with a lock adapter having a body and a biased catching mechanism operable to fit within the body near a back end of the lock adapter when in the retracted position and further operable to extend outwardly of the lock adapter body when in the extended position. The catching mechanism can be biased in the extended position and movable to the retracted position by a plunger. The plunger can be moved manually and can be locked in position using a lock such as a padlock with a shackle.

Embodiments of a cylinder lock include a main body component and an extension component, wherein a locking arrangement can be employed to move a locking element at the back of the extension component to lock or unlock the extension component from a lock structure. Embodiments of the present disclosure further provide a cylinder lock with a lock adapter having a body and a biased catching mechanism operable to fit within the body near a back end of the lock adapter when in the retracted position and further operable to extend outwardly of the lock adapter body when in the extended position. The catching mechanism can be biased in the extended position and movable to the retracted position by a plunger. The plunger can be moved manually and can be locked in position using a lock such as a padlock with a shackle.

A rekeyable lock cylinder with a cylinder body, an inner sleeve, and a plug assembly is provided. The plug assembly includes a plurality of key followers and a corresponding plurality of first racks and second racks disposed in carriers. The first racks correspond to operation of a user key and the second racks correspond to operation of a master key. As such, the lock cylinder is usable in a user/master key system. Disengaging either of the first or second racks from the key followers allows rekeying of the lock cylinder for the user key or the master key.

A method of forming lock cylinder plug using metal injection molding includes injecting a material that has a metal component and a plastic component into a mold. The metal component of the material is at least partially steel. The method includes molding the material into a lock cylinder plug having a key way passage. The method includes debinding the lock cylinder plug and supporting a portion of the lock cylinder plug using at least one ceramic support before increasing the density of the lock cylinder plug by performing a sintering heating process. The method includes inspecting the lock cylinder by inserting a key way portion of a key way gauge into the key way passage of the lock cylinder plug. Inspecting also includes classifying the lock cylinder plug as acceptable, at least in part, if the key way portion of the key way gauge is insertable entirely within the key way passage.