Check your home contents insurance policy - does it state that you must have BS 3621 (British Standard)
locks fitted to all final exit doors, or locks with at least 5 levers, and window locks (with removeable keys) on all windows?
If the small print states you must have 'approved locks', do you know exactly what they mean? Call them and find out - chances
are that you are not insured if you do not have the level of security they require.
So what does BS3621 (British Standard) actually mean?
We are all familiar with BS lever operated Mortice locks
but what does it take for them to pass the British Standard
certification? Below is a quick guide to the most common requirements:
a. All locks must have a minimum of 1000 differs.
markings should be used only once and shouldn’t disclose the combination of the key.
2. Lock case
a. Lock cases must be hardened
b. Lock cases must be able to withstand a lateral force of 10,000N for
a minimum of one minute.
c. Hook or claw bolts must be able to withstand a pull force of
at least 6,000N.
deadbolt must throw at least 20mm.
b. The deadbolt is tested with a force of 15N to the
end of the deadbolt to ensure that it cannot be pushed back.
c. The deadbolt must be able to
withstand attack by cutting or drilling and is subjected to 5 minutes of drilling.
deadbolt must be able to withstand a force of 6,000N for one minute in the direction that the bolt moves to unlock.
The latch mechanism is tested for 200,000 cycles with a side load on the latch
bolt of 10N.
Staples and strikes are tested by applying a force of
a General Vulnerability Assessment (GVA) is carried out by a panel of
locksmiths using hand tools to replicate an attack by a burglar. The
methods employed are changed from time to time to reflect current
So what else to consider?
Have you suffered a break-in and are concerned that the burglars may have taken keys. Do you want your locks changing
to be safe? Have you recently purchased a house, and unsure who still has possession of the keys? Are you concerned about
the security of your new property? Has a relationship ended and you worry that your ex-partner still might have keys
to your property? Are you a landlord and a tenant has disappeared with the keys. Don't worry, we have seen
it all before.
Linacre Locksmiths can help! Call 07977 576655 anytime to speak
to a locksmith immediately, or our office anytime on 01603 408528
Unless badly worn there is no need to replace many locks since most can be re-keyed at
far less cost than their replacement value.
All locks supplied and fitted including uPVC cylinders and locking mechanisms, rim cylinders,
mortice and sash deadlocks to insurance approved BS3621 standard (where applicable), are of the highest quality. We do not
fit cheap, low-quality foreign imports that fail after a few months, those sorts of locks you see on eBay. Would you trust
the security of your family and home to an unbranded lock bought cheap!! We stock well-known respected brands, proven
to give years of reliable service. We also supply and fit hinge bolts (essential for outward opening
doors), padlocks, digital locks, shoot bolts, door chains, door viewers, patio door locks, and other various domestic and
commercial locking devices.
All brands of lock supplied – Chubb, Union, Yale, Era, Legge, Securefast, etc.
Using a dry lubricant like graphite will keep your locks functioning in top notch shape.
If it is getting harder to turn the lock, the key is likely out of manufacturers specs and
requires replacement. Don't force the key because your likely to break the key off in the lock.
If in doubt, a lockset problem or door repair might be best left in the able hands of a professional
locksmith - such as Linacre Locksmiths.