Backset
Backset is the distance from a door-edge datum to the lock operating centre or specified bore centre. Confirm the datum used in the manufacturer's drawing before reading the value.
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Explore lock components, technical terms and manufacturer documents.
BHMA residential lock ratings
BHMA Secure Home residential lock ratings assess security, durability and finish separately. Read all three dimensions rather than treating the label as one overall grade.
Bluetooth and Wi-Fi connections
A smart lock may use both Bluetooth and Wi-Fi, but their availability and supported operations depend on the specific model and application conditions.
Door-lock bore holes
Lock preparation includes the main bore through the door face and the bore from the door edge. Distinguish their positions when reading bored-lock documentation.
Cylinder escutcheons and protective guards
Escutcheons and protective guards around a cylinder opening can look similar while differing in material, construction, fixing method and compatibility. Selection should distinguish door-face coverage from the specific purpose of a protective device.
Cylinder thumbturns and prepared-shaft interfaces
A companion thumbturn must match the cylinder's prepared-end interface. Grip shape and dimensions describe operating clearance only; they do not independently establish bore, fastening or functional compatibility.
Euro-profile cylinder
A Euro-profile cylinder is a locking-control component in a door-lock system, with a particular external profile and operation by key or thumbturn. It is one cylinder format, not a complete door lock.
Door closer arm types and installation conditions
Standard arms, slide arms, hold-open arms and parallel-arm mounting describe different constructions or configuration relationships. When selecting a closer, confirm arm type and mounting method together with door width, weight and body model.
Door closer speed, backcheck and delayed action
Closing speed, final latching, backcheck and delayed closing act during different movement phases. They are distinct adjustments and do not mean the closer can hold the door permanently open.
Compatible door thickness
Compatible door thickness is the range of leaf thicknesses supported by a complete lock and its mounting accessories. Check it against the actual door and configuration.
Fixed dummy handle
A fixed dummy handle pushes or pulls the door leaf and does not rotate to drive a lock mechanism.
Door-lock durability testing
Durability testing checks whether a lock continues to work after repeated operation and specified loads. Test-cycle counts do not directly represent years of service.
Lock faceplate
The faceplate is on the edge of the door leaf, surrounding the bolt or covering the lock-case opening. It is not the strike plate on the frame.
Door hardware finish and corrosion testing
Finish testing evaluates how coatings or finishes perform under specified environmental conditions, including corrosion and humidity. A colour name is not a corrosion-resistance grade.
Door hardware surface cleaning
Before cleaning a lock, identify its finish and model instructions and use the corresponding wiping method. Surface cleaning does not replace maintenance of internal mechanisms.
Electrified lock holding current
Holding current is the current specified by the manufacturer to maintain a particular operating state. It is a separate field from maximum current; the lower holding current alone does not describe the complete power-supply requirement.
Keypad access and electronic locks
A keypad can provide keyless operation, but its presence does not mean the lock supports remote network access.
Latch bolt
A latch bolt usually means a spring-operated bolt with a bevelled face. Schlage's terminology describes it as a component that engages when the door closes.
Smart-lock battery maintenance
Select battery type for the exact smart-lock model and replace batteries as a set. Similar appearance does not justify substitution with another battery type.
Maglock rated holding force
Rated holding force is the manufacturer's holding-capacity specification for a defined electromagnetic-lock configuration. For double-door information, distinguish values per leaf from values for the complete device.
Key retention in padlocks
Some padlocks require the shackle to be locked before the key can be removed. This is a key-removal condition, a separate selection item from keyed-alike management, replaceable cylinders and shackle clearance.
Padlock shackle diameter and opening dimensions
Shackle diameter describes the thickness of the bar passing through the hasp; opening dimensions describe the space available inside the shackle. Both differ from lock body width and should be checked separately.
Passage-function lock
Passage function uses a latch to keep a door closed without providing locking, commonly at interior locations that do not require privacy locking.
Privacy-function lock
A privacy-function lock provides indoor privacy control, usually locked by an inside button or thumbturn. It does not describe an exterior-door security rating.