// Reference · Plain-English

Locksmith Terms, Explained

Rekey

Changing the internal pins of an existing lock so old keys no longer work and a new key does. Cheaper than replacing the lock and the fastest way to secure a home after a move or a lost key. Related service →

Transponder key

A car key with a chip that sends a coded signal to the vehicle's immobiliser. The engine will not start unless the chip is recognised, so a copy must be electronically programmed, not just cut. Related service →

Laser-cut (sidewinder) key

A car key cut with a winding groove down the centre of the blade rather than along the edge. It needs a specialised cutting machine and is common on newer and higher-end vehicles. Related service →

Proximity / smart key

A keyless fob that unlocks and starts a push-button vehicle while staying in your pocket. Replacing one requires origination and pairing to the specific car. Related service →

Deadbolt grade

ANSI/BHMA rates deadbolts Grade 1 (highest, commercial-strength), Grade 2, and Grade 3 (builder-basic). Grade 1 or 2 on exterior doors resists forced entry far better than the Grade 3 most homes ship with. Related service →

Strike plate

The metal plate on the door frame that the bolt extends into. Swapping short screws for three-inch screws that reach the wall stud is one of the cheapest, most effective security upgrades there is. Related service →

Cylinder

The part of a lock the key turns. Many services (rekeys, high-security upgrades) act on the cylinder alone without replacing the whole lock body. Related service →

Master key system

A keying plan where one master key opens many doors while each door also has its own individual key. Common for landlords, offices, and multi-unit buildings. Related service →

Restricted keyway

A patented key profile that ordinary hardware stores and kiosks are not allowed to copy. It stops unauthorised duplication of your keys. Related service →

Bump key

A filed key used to force pin-tumbler locks open by impact. Bump-resistant or high-security cylinders defeat this common break-in method. Related service →

Mortise lock

A heavier lock whose body is fitted into a pocket cut into the edge of the door, common on older and commercial doors. Repairs need locksmith-specific parts. Related service →

Panic bar (exit device)

The push bar on a commercial exit door that lets people leave instantly in an emergency while staying locked from outside. Often required by fire code. Related service →

Immobiliser

A vehicle anti-theft system that blocks the engine from starting without the correct transponder or fob signal. It is why a plain metal copy of a modern car key will turn but not start the car. Related service →

Key origination

Making a working car key when no key is present, usually from the vehicle's VIN and lock decoding. It is more involved than duplicating an existing key. Related service →

Ignition cylinder

The lock the key turns to start the car. Worn cylinders bind or trap the key; they can often be rebuilt or replaced without towing to a dealer. Related service →

Lockout

Being unable to get into a home or vehicle because the key is lost, locked inside, or broken. A locksmith uses non-destructive entry first wherever possible. Related service →

Non-destructive entry

Opening a lock by picking or bypass rather than drilling, so the existing lock still works afterward. The default professional approach on a lockout. Related service →

Keyed-alike

Setting several locks so a single key operates all of them. Convenient for a home where the front, back, and garage doors currently take different keys. Related service →

Fob programming

Electronically pairing a remote or proximity fob to a specific vehicle so it can lock, unlock, and start it. Required for any replacement or additional fob. Related service →

Service call fee

A base charge to dispatch a technician, often credited toward the work if you proceed. A reputable locksmith states it on the phone, never sprung at the door. Related service →