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CEN grade stands for Central European Norm, which is a testing standard for padlocks. Padlocks must pass through a number of intensive tests in order to achieve a certain CEN grade. There are 6 levels of CEN grade, ranging from 1-6. CEN grade 6 padlocks are the highest quality padlocks, offering maximum security.
We offer a range of CEN grade 3, 4 & 5 padlocks, Check out our high security padlocks
BS3621 is a lock standard by British Standards Institute (BSI) for thief-resistant locks, BS-3621 locks are found on some front and back doors in the home and it's a good way to check that your security is up to standard. This is why some insurance companies require door locks to be fitted to BS 3621 British Standard.