Legge N5641 British Standard 3621:2007 Mortice Deadlock

Product Information

The Legge N5641 British Standard 3621:2007 Mortice Deadlock. This certification is for thief-resistant locks and makes these excellently suited for the front or back of residential buildings.

Conforms to the BS 3621:2007; meets the exact demands of insurance companies and the Police.

These locks are 5 lever, can withstand drill attacks for 5 minutes, bolt attacks for 5 minutes and also contains an anti-picking mechanism.

The 20mm twin hardened steel plate deadbolt is both locked or unlocked by key from either side.

Sizes

• Product category: Mortice Deadlock
• Product type: British Standard
• Case colour: Black
• Handle piercing size: N/A
• Case height: 89mm
• Centres: N/A
• Faceplate height: 134mm
• Faceplate width: 26mm
• Deadbolt throw: 23mm
• Follower size:
• Keys: 2
• British Standard?: BS3621:2007
• UKCA marked?: Yes
• CE marked?: Yes
• Certifire approved?: Yes
• Fire rated?: 60 mins
• Can be keyed Alike?: Not currently
• Handed?: Non handed
• Escutcheon plates supplied: Yes

Operation

Legge N5641 British Standard 3621:2007 Mortice Deadlock is a British Standard 5 lever mortice deadlock with BS 3621 Kitemark for quality, reliability and trust.  Offering exceptional resistance against attack, the deadlock comes with anti-pick, anti-saw and anti-drill security, making it ideal for external doors. 

They comply with BS3621, and they are CE, UKCA and Certifire tested.

The Legge N5641 lock is designed with hardened steel plates to resist drilling and two hardened steel plates in the deadbolt to resist hacksawing. The keys have 1000 variations for added security and the all steel levers have false notching to resist lock picking

These locks meet the requirements of British Standard BS3621:2007. To meet this standard, products undergo rigorous testing. Featuring 5 levers, anti drill and anti saw features, these are a high quality and high security mortice lock.

In line with a number of other mortice locks, these locks feature a black lock case but they have unique measurements that identify them from other mortice locks. Please refer to the line drawing for details.

This mortice lock BS3621 is available in polished brass or chrome colours.

To meet the requirements of British Standard BS3621, the deadbolt throws at least 20mm from the body of the lock to ensure positive deadlocking and additional resistance against attack.

The deadbolt can be locked and unlocked from either side by use of the key.

This lock is supplied with 2 key hole escutcheons, in a matching finish to the lock for both the internal and external sides of the door. It also comes with a security striking box (to meet the requirements of BS3621) in a finish to match the faceplate.

Suitable for use on doors up to 54mm thick. The thickness of the door is determined by the length of the keys. If you require this lock to be fitted to a very thick door, we may be able to supply extra long keys. Please contact us for more details.

These locks are not handed and can be used on doors hinged on the left or right, which open inwards or outwards.

Supplied with 2 keys as standard. We can cut additional keys for this lock, just select whether you'd prefer genuine or copy key blanks and the quantity required from the associated products on this page.

Many insurance companies insist that locks fitted to external doors comply with BS3621 or BS8621. Your client should always check with their insurance company to be sure. These locks meet the requirements of BS3621 and you can find the BSI kitemark on the faceplate.

In order to comply with the British Standard, these locks must feature: - 5 levers with at least 1000 key differs - Anti pick features to prevent the lock from being picked - Hardened plates that protect the sides of the lock from being drilled - a minimum 20mm bolt throw into the keep or strike

You can find a very useful guide to British Standards for mortice locks on the MLA's website here: https://www.locksmiths.co.uk/faq/what-are-bs3621-british-standard-locks/

These locks are CE and UKCA marked and tested to EN 1634-1 for use on 60 minute fire doors.

Please always check the relevant fire assessment, door specification or with the relevant authorities that this product is suitable for use in the specific environment that it is fitted in. You can find more details about the product on the DOP.

This lock has been independently tested by Certifire for its suitability for use on fire doors.

These locks do not feature an escape function and can be locked from the outside which may make them unsuitable for use in certain environments.

Mortice lever locks (sometimes called mortise locks) are commonly fitted to wooden doors but can also be found used in steel, aluminium, and composite doors. They are locked from both the inside and outside with the key which throws the deadbolt. By definition, a mortice lock is fitted (“morticed”) within the door, rather than being fitted to the face or surface of it.

There are multiple types of lever lock in use in the UK. Dead locks (mortice dead locks) are operated by a key only whereas sash locks (mortice sash locks) feature a dead bolt and a latch which is operated by a handle (often a lever handle). Both lever locks with throw the dead bolt into a strike plate. The strike plate on sash locks also accepts the sprung loaded reversible latch.

Lever mortice deadlocks can be used for fitting to front or back doors and to internal doors and external doors, but we’d always recommend fitting a British Standard BS3621 product to external doors for maximum security. You should also check with the houseowner’s insurer’s requirements on both residential properties and commercial properties. You may find lever locks fitted to commercial properties but cylinder lock cases operated by a cylinder or pin tumbler lock are more common mortice locks fitted in commercial environments.

Lever mortice door locks are commonly used for internal doors too. These tend to be 3 lever mortice locks where the requirements for security and burglary prevention are lower.

When replacing an existing lever mortice lock, you may find that your replacement mortice lock is larger than the one that you are replacing. This may be because you are improving security, such as upgrading to a lock with thicker, anti-drill hard steel plates or because the forend length, forend width or the design of the lock has changed. The hole for the lock can normally be made larger with a hammer and chisel. This can also be the case for strikes, which may have changed design.

When fitting a lever mortice lock to new timber doors, we’d recommend using Souber’s DBB morticer for quick results. You can find the DBB1 morticer here: https://www.duffells.com/souber-dbb-mk2-mortice-jig.html.

Please always ensure that your door is sufficiently thick to accommodate the mortice lock that you are fitting. The Master Locksmith Association recommend a minimum thickness of 44mm.

A lever mortice lock prevents a door from opening by throwing a bolt from the lock into a metal keep or strike, fitted to the frame. Once the bolt is engaged in the keep, a hinged door is prevented from being opened. A mortice lock bolt is locked or unlocked from either the inside or outside by a key. Inside the lock, there is space for the bolt to be retracted. If the cuts in the key match the levers inside the lock, the user will be able to turn the key to throw (to lock) or withdraw (to unlock) the bolt. If the wrong key is used, the levers will not line up and the lock will not operate.

Duffells stocks a huge range of mortice locks at all levels of security. All of our lever mortice door locks are available for delivery in as little as 24 hours. We offer a range of express delivery options as well as standard delivery and you can find delivery details on our thousands of products on our delivery info page.