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.

BS EN 1303

This standard classifies cylinders using a 7 digit coding system.  Each digit refers to a particular feature of the product measured against the standard's performance requirements.  The standard includes tests on durability, fire and corrosion resistance.

BS EN 1935

This standard provides details on product types, classification by use, test cycles, door mass, corrosion resistance, as well as definitions, product performance requirements, test apparatus, test methods and marking of products. In addition, the published standard includes annexes with details for special applications.


This British Standard applies to Mortice Locks and Nightlatches.  All locks that carry the BS3621 kitemark meet the standards set by insurance companies and the police.

BS6375, Pt 2

The British Standard that relates to the effectiveness of “child safe” restrictor hinges.


The British Standard that relates to the overall performance of PVCu windows.


The British Standard that relates to the enchanced security of windows.


British Standards Institute

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.

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.

Compression rollers/Mushrooms/Cams

Compression rollers can generally be found on multi-point locks that are installed into PVCu doors. They may be positioned at various intervals along the faceplate of the lock and help to create an even weatherseal down the locking side of the door, thus helping to prevent draughts and water seepage.

Note: Compression rollers are primarily designed to create compression. Should security be priority on the door, Yale recommend multiple locking points be specified  i.e. hookbolts.