The following Glossary of Locksmith Terminology is provided courtesy of the Master Locksmith Association (MLA). Click on a letter below to be taken to its corresponding terms.

Rack Bolt - A bolt, usually a door bolt, which is toothed so that it may be operated by a pinion.

Radiused forend - A lock forend which is shaped radially, for use on one of a pair of swing doors.

Retaining Ring - 1. Usually a ring made of spring material which can be sprung open or closed for getting into position in order to retain some part or parts. 2. a circlip.

Rounded forend - A forend with rounded ends. It is used when the mortice for a forend is cut out by router, usually by machined manufacture of wood or metal doors.

Rebate - The measurement of the stepped reduction or recess in the forend of a rebated lock.

Rebated (lock or latch) - A mortice lock or latch with a forend specially shaped to correspond with the shaped meeting edge of the door for which it is intended. See “Full Rebated”.

Release - A striker in various forms to replace the lock strike and is operated electronically.

Relocker - A locking mechanism independent of any key operations, mounted remotely within a safe mechanism so as to relock the boltwork under certain forced attacks.

Repeat differs - That supply of differs which have been issued previously. This is usually associated with master keyed suites and where a replacement lock is required to have the same differ as the original.

Reversed bolt (RB) - A springbolt which has been turned round in its case to suit a door opening outwards instead of inwards. Great care should be taken to use this term RB only when ordering items which are required with the springbolt reversed.

Rigid grilles - Heavy duty, welded construction, rod or bar grilles, usually fitted externally or internally to the fabric of a building.

Rim Cylinder - This relates to a pack which usually comprises the cylinder with plug, rose, ‘connecting bar, two connecting screws and two keys.

Rim lock or latch - A lock or latch that is fitted by screwing on to the inside face of the door.

Roller bolt - A springbolt made in the form of a roller, instead of being bevelled. It is recommended for more silent and easier closing of a door. It does not need reversing to alter the hand.

Rose - 1. A cylinder rose or ring in cylinder locks or latches. It is a shaped metal disc which surrounds the outer face of the cylinder
2. In door furniture, it is the small plate to which the lever handle or knob is affixed and which is screwed to the door surface.

Tel. 0800 0 187 187

e-mail: callcentre@timpsonlocksmiths.co.uk