Glossary of terms

Select the term in the list below. For additional questions please contact your local retailer.

Glossary of terms in alphabetical order

ABC

Backset

The measurement used on nightlatches and mortice locks.

Bathroom Lock

A mortice lock which is used with thumbturn handles to allow the occupant of the bathroom to lock the door from the inside.

CE Marking

CE Marking on a product is a manufacturer's declaration that the product complies with the essential requirements of the relevant European health, safety and environmental protection legislations, in practice by many of the so-called Product Directives.

Butt Hinge (for doors)

Hinges are designed for timber doors, purchased pre assembled and fitted on site to enable doors to be hung

Carbon Steel

An alloy which is used in the manufacture of window hardware, usually being coated to increase its corrosion resistance.

DEF

Deadbolt

On a mulit-pojnt lock, the deadbolt is located at the centre of the lock to add increased security. Normally of rectangular shape but can also be in the shape of a hook.

Deadlock

A mortice deadlock does not have a latch, but a bolt only which is operated by key.

Some nightlatches have a deadlocked function that adds extra security to the locking mechanism after the key has been rotated for a second time.
 

Door Chain

Also called Door Limiter. A fitment that restricts the door to being partially opened in order to identify callers prior to opening the door for access. Can be either an integral part of the lock mechanism or surface mounted on the inner face of the door.

Door Limiter

Also named Door Chain. A fitment that restricts the door to being partially opened in order to identify callers prior to opening the door for access. Can be either an integral part of the lock mechanism or surface mounted on the inner face of the door.

Electric Strike

An electrical device that permits releasing of the lock in the door from a remote control.

Euro Profile Cylinder

A cylinder barrel with a specific shape that can be fitted and used in many types of locks including mortice locks and multi-point locks.

Follower

Also called Rower

A square hole created in the backset of a mortice lock to allow the spindle to feed through to operate the handle.
 

GHI

Hookbolts

Hook shaped bolts used on a multi-point lock, designed to assist door compression and a high level of security against forced attack

JKL

Journal Supported Door Hinge (for doors)

Used on external doors for high-usage situations and gives maximum endurance with minimum maintenance requirements.

Keep/Receiver/Striker

A metal plate or box which is pierced or recessed to receive the bolt or latch when projected

Laminated Glass

A type of “safety glass” much stronger than float glass, made up of two layers of glass bonded together with a tough plastic film.

Latchbolt

Most mortice sashlocks have an easily reversible latchbolt for securing the door so that it can still be operated by handle from either side.

Levers

Levers are used in some mortice locks and padlocks.  The higher the number of levers a lock contains, the higher the level of security it offers.

Locking Point

The point where the multi-point lock enters the outer frame of the door, using either a hook or a rectangular shaped bar.

MNO

Master Key

One key that operates a number of locks where the individual locks each have their own, different key.  For further information, contact your locksmith.

Mortice Lock

The lock fits into a mortice that has been ‘cut out’ of a timber door edge. The locking action is achieved by a bolt that shoots out of the lock into the striker plate when the key is turned.

 

Mullion

The vertical member of a sash, window or door frame between openings in a multiple opening frame.

Multi-Point Lock

Describes a type of lock mechanism that has more than one locking point.  It usually has a minimum of three locking points (plus latch) spread strategically over the length of the door.  Multi-point locks are typically used on PVCu or composite doors.

PQR

Rower

Also called follower.

A square hole created in the backset to allow the spindle to feed through to operate the handle.

STU

Safety Glass

A glass that is designed to reduce the risk of injury when broken.

Secondary Glazing

An additional layer(s) of glazing fixed to an existing window to produce a thermal/acoustic break. This is not double glazing.

Shootbolts

Shootbolts are used on multi-point locks to further secure the door into head and sill of the frame by an upwards movement of the sprung handle

Snap In Door Hinge (for doors)

A symmetrical hinge used on internal light doors in either residential or commercial applications.

Spindle

The spindle is a square metal bar which connects the door handles on either side of your door together through the follower.  When the levers of your door handles are pressed, the spindle rotates and operates the latch inside the door, allowing the door to open.

Tempered Glass

A type safety glass that has undergone a heat treatment process in order to increase its strength. Also known as toughened glass.

Thumbturn Cylinder

A knob fitted to one end of a cylinder which allows the door to be unlocked without a key from one side only

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