Why Keys Snap — and Why the Lock Type Changes Everything
Keys break for several overlapping reasons: metal fatigue from years of daily use, a sudden torque spike when someone forces a stuck mechanism, or a key that was previously bent and never fully straightened. Cold winters in the Northeast accelerate the process — Great Neck residents who leave keys in outdoor lockboxes or unheated garages through a January freeze often find the metal has become brittle enough to snap on the very next use. The break typically happens at the bow-to-blade transition, the thinnest cross-section on the key, and the blade portion disappears into the keyway. The lock or ignition type determines almost everything about how extraction proceeds. A standard residential door knob lock has a relatively open keyway and a shallow plug depth, making fragment recovery more straightforward. A traditional mortise lock — the tall rectangular lock body common in older Great Neck homes along Arrandale Avenue and in many of the village's pre-war apartment buildings — has a longer cylinder plug and a more intricate keyway profile, which means the broken piece can travel further and sit at an awkward angle. Commercial mortise lock cylinders, often found in office suites and retail spaces near the Great Neck Plaza business district, present similar challenges. Automotive ignitions add another layer of complexity because the wafer-style or sidebar mechanism inside the ignition barrel can trap a broken key in a way that mimics a locked column even after the fragment is partially freed.




