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A key generated from an incidental shear line during the key cutting process is referred to as an incidental master key. This occurs when the key cutting aligns with a shear line that was not initially intended or planned during the design of the key and lock system. The incidental shear line can allow for the operation of multiple pins within a lock, thus enabling the key to function in a manner similar to a master key.

In locksmithing, a master key is designed to operate several locks, whereas a change key is specific to a single lock within a master key system. The distinction lies in the intentionality of the design. An incidental master key arises from an unexpected alignment during the cutting process, rather than through the deliberate design of a multi-lock system. Understanding this concept is crucial for locksmiths, as it highlights the nuances of key cutting and the potential implications for security and access.