Remember last week when I introduced (maybe re-introduced) you to the nightlatch function? In the beginning, I was discussing how confusing the language of locks can be. Somewhat unsurprisingly, that hasn’t changed in the last week and it hasn’t changed since I wrote about door and lock terminology here, here, here, or here.

The only problem with those four posts is I barely skimmed the surface! You’ll get a basic understanding of door and lock terminology with those  articles under your belt but for the more complex stuff… keep reading!

Door and Lock Terminology – Deadlock

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

Door and Lock Terminology – Door Limiter

Also called a 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.

Door and Lock Terminology – PVCu

The full name being – Poly Vinyl Chlorate Unplasticised – is a material used to manufacture a wide range of products including windows and doors. Most of us are more familiar with its cousin – PVC, especially in reference to pipes.

The difference between the two is that PVCu is a more durable material. This is used extensively in building products where strength is an important attribute. Standard PVC is more suitable for projects where a more flexible material is desired as it is softer than its PVCu counterpart.

Door and Lock Terminology – Flag Hinge (for doors)

Door Hinge system used on PVCu Doors which allows for easy installation and adjustment.

Door and Lock Terminology – Hookbolts

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

Door and Lock Terminology – 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.

Door and Lock Terminology – 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.

Door and Lock Terminology – Rim Lock

Nightlatches are still sometimes referred to by their traditional name of ‘rimlock’ although a rimlock usually now refers to a basic security lock for use on internal doors, gates or outbuildings.

Door and Lock Terminology – 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.

Do you feel like a pro now? This should have you well on your way to a door and hardware professional!
Google