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.

The present invention relates to the technical field of locks, and specifically to an anti-technical unlocking pinball lock cylinder set, comprising a lock shell and a lock cylinder arranged in the lock shell, wherein inside the lock cylinder are provided lower pinball cavities, inside the lock shell are provided upper pinball cavities, above upper pinballs are provided springs, above the springs is provided a cover plate, the lower pinball cavities comprise at least one shallow cavity, inside the at least one shallow cavity is provided at least one short lower pinball, upper pinballs comprise at least one stainless steel upper pinball which forms at least one stainless steel pinball set with at least one stainless steel lower pinball corresponding to same positions below, and remaining upper pinballs which are special-shaped upper pinballs. The present invention improves structures of internal cavities and upper and lower pinballs, so as to avoid the risk of using various tools to unlock, improve the reliability and value of the lock, and provide protection for people's property and personal safety.

A lock core and key assembly includes a core body, a core plug having a core plug insert-receiving aperture, a core plug insert positioned in the core plug insert-receiving insert, and a key. The core plug insert has a taper and the key has a bow and a shank with a taper that aligns with the taper of the core plug insert.

The invention relates to a push-in-plunger-lock and housing-cylinder that facilitates an easy removal and installation of the push-in-plunger-lock as it attaches to a lockable device. Normally the push-in-plunger-lock can be mounted to a lockable device using two flanges with holes or threads on the lock being secured in place with a locknut ring. In certain particular applications of using the push-in-plunger-lock there is no suitable application to mount the lock other than metal welding the push-in-plunger-lock to the lockable device. One of these particular applications is mounting the push-in-plunger-lock on a ratchet chain binder to block the use of the U-pawl preventing the normal operational removal of the ratchet chain binder from a chain. The invention provides a housing-cylinder to insert the push-in-plunger-lock into while securing the lock in place with a pin. The pin can only be removed when the push-in-plunger-lock is in the unlocked position. The invention allows the push-in-plunger-lock to be easily changed and matched to keyed alike other push-in-plunger-locks instead of re-keying the push-in-plunger-locks or allowing the replacing of a defective push-in-plunger-lock that would involve grinding the defective push-in-plunger-lock from the lockable device and metal welding a replacement push-in-plunger-lock onto the lockable device.