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Terms & Definitions in Ironmongery
Backset
  • The horizontal distance from the face-plate through which the bolt passes to the vertically center-line of the spindle-hole, cylinder-hole or keyhole.  [View Image]
Bolt-Through Fixing Hole
  • Usually seen on mortise locks. Hole(s) on the lockcase which allow the fixing bolt(s) of a knob/lever handle to pass through and fix into the handle rose on the other side.
Caster
  • Rigid - Refers to casters that only allow forward and backward movement.
  • Swivel - A type of casters that can be moved in multiple directions by swivelling 360 degrees under a load.
Centre-to-Centre (c.c.)
  • A term commonly applied to mortise sash locks and lever mortise locks. It is used to describe the vertical distance between the horizontally center-lines of the spindle-hole and the cylinder-hole (for mortise sash locks) or the keyhole (for lever mortise locks).  [View Image]
Deadbolt
  • A locking device or a part of locking device in which the bolt cannot be moved to the open position except by rotating the hub or the key.  [View Image]
Door Hinge
  • Template Hole Pattern - Screw-holes are arranged in a crescent half-moon shape.  [View Image]
  • Staggered Hole Pattern - Screw-holes are arranged in a zig-zag shape.  [View Image]
Door Holder
  • A device used to hold a door at the open/closed position.
Door Stop
  • A device used to prevent a door from opening too widely and damaging the nearby wall.
Latchbolt
  • A part of locking device. It is a spring-loaded bolt with an angled edge. In mortise lock, as an example, latchbolt is typically retracted by rotating the hub (e.g. turning the door handle) and the spring allows it to extend automatically.  [View Image]
Lockset
  • Cylindrical Lockset - This type of locksets is installed by boring two circular holes in the door. The latchbolt has to engage into the retractor in the chassis of the lockset. When the lever handle is being rotated, the retractor pulls the "tail" of the latchbolt unit it is fully retracted.
  • Tubular Latch Lockset - There are actually 2 devices in this type of locksets, a tubular latch and a knob/handle set. The fixing bolt(s) of the knob/handle set commonly has to go all the way through the fixing hole(s) of the tubular latch during installation.
Mortise Lock
  • Privacy - Latchbolt is retracted by knob/lever handle from either side. Deadbolt is operated through the rotation of hub.
Non-Handed
  • With door handles as an example, "Non-Handed" means handles can be used on both left and right-handed swinging doors.
Push Button Lock
  • Easy Code - This is an advanced version of the traditional push button lock. This lock is designed to simplify code-changing process. Users can change the code by removing the device from the door and then rotating the dials on the back of the panel with a screwdriver.
  • Holdback - In the locked position, the inside lever handle is rotated back to 12 o'clock position and the latchbolt is fully retracted. However, with holdback feature, the handle cannot be rotated and the latchbolt remains in the retracted position.
Rim Lock
  • A traditional locking device that is installed to the surface of a door.
Self-Closing
  • Closing or shutting automatically after being opened.
Soft-Closing
  • A mechanism of slowing the movement of doors, and pulling them to the fully closed position.
Window
  • Side Hung - Referring to vertically pivoted windows, which allow more ventilation into the internal space.
  • Top Hung - Referring to top, horizontally pivoted windows. Ideally, these windows allow an open view of skyline and increase the amount of natural daylight in the internal space.