When choosing your 5 lever lock, make sure it is stamped or kitemarked with BS3621 - this is a lock standard rating given by British Standards for thief-resistant locks. 5 lever locks are also generally sold in two sizes: 2.5 inch and 3 inch case sizes. These translate to 44mm and 57mm backset measurements.
There are two sizes of mortice locks: 21/2” and 3”.
Most backsets are commonly measured at either 44mm (for a 64mm (2½”) lock) and 56mm (for a 76mm (3”) lock). Typically a lock adjacent to a glass panel will be 2½” (44mm) and otherwise 3” (56mm), but you should always measure to be sure.
5 Lever BS Deadlock in 64mm and 76mm options.. British Standard BS3621 Rated Dead Lock used as a matter of course ...
Tubular Latches, Sashlocks, Deadlocks and Bathroom Locks are available in varying lengths and sizes to suit your requirements or match existing ones already fitted in your doors.
For a Mortice Deadlock you should only require the measurements of the Backset or the Case. This is the measurement from the front plate to the back of the lock case or the back of the slot the lock fits into in the door. If you have the old lock this measurement can be easily taken with a ruler or tape measure.
Available in 2 ½ inch size (with 45mm backset from edge of door to handle turn) or 3 inch size (with 57mm backset from edge of door to handle turn). British Standard BS3621 Rated Sashlock used as a matter of course by the national house builders.
Featuring five parallel levers that all need to be lined up by turning the key to allow the bolt stop to come across, it's an exceptionally difficult lock to pick. That's not to say that it can't be picked, as there are doubtless experienced locksmiths that have the required skill, but they're still highly secure.
Here are the most common ones: Tubular Mortice Latches – these are by far the most common. They have a sprung nib which is operated by turning a door knob or handle. They come in 'Standard' or 'Heavy' sprung versions.
A pin-tumbler mortise lock is the most common type of mortise lock available. These Locks are very simple to operate and are fairly inexpensive. However, they are easily picked and are less secure than other types of locks. They are commonly found in older homes and apartments.
Are mortise door locks universal? Yes, a mortise lock set and mortise door lock is universal and can easily be used to replace most other lock sets, especially on an older door.
Whether your lock is broken and needs replacing or you're just ready for an updated look, mortise locks are generally simple to remove and replace; standard mortise lock replacement parts made by Emtek, Juralco, Pado, Papaiz or new-style Wright are easily interchangeable.
The more levers, the higher the level of security. Therefore, a 5 lever lock is more secure than a 3 lever mortice lock. It's also important to note that 3 lever locks are not BS3621 approved.
The pros of having a 5 Lever Mortice deadlock as your door lock are: ✔ More secure than having a 3 lever deadlock. ✔ Can be keyed alike.
Yale Locks PM562PB25 Hi-Security BS 5 Lever Mortice Dead Lock 67mm 2.5-inch - Polished Brass Finish : Amazon.co.uk: DIY & Tools.
Replacing a full mortise lockset:
This can usually be done by removing a few screws in the door knobs, around the face plate, and the lockset. Fit the new lock body into the old mortise.
The Master Lock No. 5 Laminated Steel Padlock features a 2in (51mm) wide reinforced laminated steel lock body providing extra strength and a 1in (25mm) tall, 3/8in (10mm) diameter hardened steel shackle for excellent cut resistance.
A 2 lever lock will be most suitable for your internal doors such as bathroom and bedroom doors, where high security is not a priority. A 5 lever lock will offer about 500 key differs, which decreases the probability of a duplicate key being nearby.
All lock cylinders are 1.156" diameter. Brass blocking rings are used with lock cylinders like L-9CC when the lock cylinder protrudes from the door (or door plate) of a thin door.
Case depth is also a common main concern when it comes to sash lock size, with the two most common being 64mm (2.5 inches) and 76mm (3 inches) for 3 and 5 lever sash locks.
Measure from the outside edge of the door (including furniture) to the centre of your door. This is dimension A and is called the External Size to Centre. Next, measure from the inside edge of your door (including furniture) to the centre of your door to find dimension B, the Internal Size to Centre.
Replacement hardware needs to fit your door, and hardware for a new door requires a hole saw in the correct size. Typically, deadbolts need a bore hole 1 1/2 or 2 1/8 inches in diameter. Levers and handlesets usually need a hole 2 1/8 inches in diameter.