Rekeying Locks: New Keys Without New Hardware
Rekeying changes a lock's internal pinning so previous keys no longer operate it, while the lock body, trim, and cylinders remain in place. New homeowners, landlords after tenant turnover, and businesses after key loss routinely rekey rather than replace — saving cost when hardware is still sound.
The procedure is foundational locksmith work: remove the cylinder, dump old pins, insert springs and new key pins matched to a new bitting, then verify smooth operation and master-key compatibility if applicable.
When to Rekey vs. Replace
Rekey when cylinders are not worn, damaged, or obsolete. Replace when upgrading security grade, converting to smart locks, or correcting mis-drilled doors. Rekeying after buying a home is standard even if sellers swear only one key existed.
Pinning Procedure
Locksmiths decode existing bittings or cut keys to a new code, then load pin stacks to align shear lines. Plug followers and pinning tweezers prevent spring launches. Lab pinning mats organize components by size.
Master Key Considerations
Rekeying one suite in a master system requires updating pinning charts without breaking hierarchy. Software like proprietary key system databases tracks change keys, masters, and grand masters.
Interchangeable Cores
IC cores (SFIC, LFIC) swap in seconds with a control key — popular in universities and offices where frequent rekeying would otherwise require disassembly.
Customer Education
Rekeying does not fix worn latches or weak strike plates. Technicians should explain that security is a system: keys, cylinders, doors, and frames together determine real-world resistance.