A cylinder locking device is provided in which an inner cylinder is pivotably inserted into a cylinder body, a protector is disposed opposite a rear end of the inner cylinder along an insertion direction of a mechanical key, the protector enabling the mechanical key to be inserted toward the inner cylinder, and a coil-shaped spring is provided between the protector and the inner cylinder or the cylinder body, wherein the spring is formed so as to have a coil portion that extends in the axial direction of the inner cylinder and a bent portion that is bent from at least one end part of the coil portion toward an interior of the coil portion in a direction along an axis of the inner cylinder. This enables deformation of a coil-shaped spring to be prevented.

A pin tumbler lock apparatus includes a shell and a gate housed within the shell. The gate consists of a cylindrical case with multiple bores. A core, positioned within the gate, features a keyway and additional bores aligning with the gate's bores to form pin chambers when locked. Key pins within these chambers are magnetically responsive and vary in height within a defined range. Each key pin comprises a body and an oversized top element. Channels in the gate correspond to the pin chambers, allowing the top element of each key pin to move within its respective channel when a key is inserted into the keyway and the core is rotated relative to the gate.

A pin tumbler lock apparatus includes a shell and a gate housed within the shell. The gate consists of a cylindrical case with multiple bores. A core, positioned within the gate, features a keyway and additional bores aligning with the gate's bores to form pin chambers when locked. Key pins within these chambers are magnetically responsive and vary in height within a defined range. Each key pin comprises a body and an oversized top element. Channels in the gate correspond to the pin chambers, allowing the top element of each key pin to move within its respective channel when a key is inserted into the keyway and the core is rotated relative to the gate.