We present a glossary of terms that might be useful for you, this is a work in progress, intended for information & not to set any precedent or legal definition. If you do require a serious legal definition then we refer you to the relevant Australian Standards - including AS 4145.1-2008. We also refer you to training material developed by ADHA. We have used this information (the Standards and training) & our own understanding to produce what we believe to be relevant & useful information. We have added definitions, changed definitions and excluded items that are described in the reference material that we do not believe is required here (but if you need serious legal definition then you know where to go). 

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Access to Premises Standards: The Disability Discrimination Act (DDA 1992) has been 'clarified' by the The Disability (Access to Premises - Buildings) Standards launched on 15/03/2010 & in operation for any building approved for construction post 01/05/2011. See our blog post for more commentary. There are some reasonably straightforward - but far reaching implications that apply to many doors in many building projects:
  • that lever handles & pull handles have a maximum distance 35-45mm from the inside of the handle to the backplate or the face of the door at the centre of the handle 
  • that lever handles have a minimum 20mm return 
  • that snibs have a minimum length of 45mm from the centre of the handle 
  • that  the maximum force to initially open a door, swing or slide a door, or hold a door open at between 60 degrees or 90 degrees is 20N

Active leaf: The first opening leaf of a pair, it usually houses the lock or latch.

ADHA: The Architectural Door Hardware Association. Keeler Hardware is proudly a founding member and Craig Keeler-Milne is an Executive Member. The ADHA represents the architectural openings industry in Australia. Comprising Australia's leading manufacturers, distributors and architectural product agents, ADHA members are dedicated to excellence in all aspects of product, consultancy, services and training. ADHA monitors relevant Australian Standards and provides input to ensure that members' interests are represented. Where appropriate ADHA seeks direct member representation on standards. More information at adha.net.au

Allgood: English hardware architectural ironmonger represented in Australia by Keeler Hardware since the 1970s. Allgood's brands include Allgood, Modric, Sembla and Contego.

Alloy: The combination of two or more metal elements to achieve special strength, hardness, corrosion resistance or appearance characteristics.

Anti friction bearing hinge: A bearing used in a hinge for the purpose of reducing friction and improving efficiency. Normally balls, oil-impregnated or other anti-friction material is used.

Anti friction bearing latchbolt: A latchbolt equipped with a device for reducing friction between the bolt and strike. Usually a small trigger attached to the bolt contacts the strike and exerts a lever action to depress the bolt.

Astragal: A member or combination of members applied to one or both doors of a pair at their meeting edges. The astragal closes the clearance gap for the purpose of either providing a weather seal, minimising the passage of light between the doors or retarding the passage of smoke or flame during a fire.

Auto flush bolt: A special flush bolt commonly used on fire rated doors, designed to be fitted to the inactive leaf. The closing active leaf depresses the triggers (latches) on the auto flush bolt and fires the bolt up into the frame or down into the threshold. This effectively secures the inactive leaf and the active leaf is usually then locked into the inactive leaf.

Auxiliary bolt: An additional bolt that is activated by the strike when the door is closed, automatically deadlatching the latchbolt against end pressure.


Back check: An inbuilt hydraulic buffer that cushions and checks the opening movement of the door normally from 75° of opening. Designed to prevent the door from being thrown open and possibly causing damage to door and frame, and door hardware. Note that on some door control products (such as DORMA's cam action TS90 TS91 TS92 & ITS96 products) this is achieved through a limiting stop mechanical buffer inserted into the slide channel rather than a hydraulic back buffer. Back check is a requirement of AS 1905.1 - 2005 Components for the protection of openings in fire-resistant walls Part 1: Fire-resistant doorsets - 2.2.5 Cushioned back-checking action of the closer: The self-closure system shall provide a cushioned back-checking action to prevent shock when the door is forcibly opened. This action shall not commence until the door leaf has opened to not less than 75° and shall be effective over not less than the last 5° of opening (see Note 1). Where an adjustable valve is provided, that valve shall not be capable of preventing the cushioned back-checking action. Note 1 The final angle of effectiveness of the cushioned back-checking action depends on the particular location where each fire-resistant doorset is to be installed. For the purposes of fire resistance testing, it is recommended that the maximum opening angle of the door is assumed to be 90°, and that the tested specimen be set to permit this angle of door opening. We refer you to the relevant document published by Standards Australia and available through their distribution networks.

Backset: The distance from the edge of the door to the centre line of the keyhole or central axis of the knob or lever, or whichever is closest to the edge of the door.

Ball bearing hinge: A hinge equipped with ball bearings between the hinge knuckles to reduce friction. Recommended for doors having doors closers or doors of high frequency usage.

Bevel: Angle of the striking face of a latchbolt.

Bevelled faceplate: A faceplate shaped to fit the closing edge of a door which is not at 90° to the face of the door.

Bitted key: Generally means a cut key. Also applied to lever locks where the key has the blade projecting at right angles to the shank.

Bolt: The part of the lock or latch that projects to engage the strike or staple.

Bolt projection: The measurement of the distance that a bolt protrudes from the faceplate when fully extended.

Bolt throw: The measurement of the maximum travel of the bolt to the fully extended position.

Box strike: A strike in which the bolt recess is enclosed or boxed, thus covering the opening in the jamb.

Broach: A tool used to cut the keyway into the cylinder plug. A term also used for the keyway shape.

Budget lock: A lock, usually operated by a square-shaped key, offering very little security.

Butt hinge: A type of hinge designed to be morticed into the door edge and into the rebate of a doorframe.


This is the start, more to come each week.... all the way to Zucchini lock (do you know what that is?)