The cylinder is the smallest part of your door and nearly always the weakest. An armoured door with a ten-euro cylinder is still an insecure door — and it is a combination we run into often across the Algarve.
The three attacks that matter
Bumping
A modified key and a sharp tap. It opens ordinary cylinders in seconds and leaves no visible trace — which also complicates an insurance claim. A certified anti-bumping cylinder uses specially profiled pins that defeat the technique.
Drilling
A drill destroys the pin stack in under a minute. The defence is hardened steel or carbide inserts inside the cylinder body, which wreck the bit before it reaches the mechanism.
Snapping
The most common method in domestic burglaries: grip the cylinder and wrench it out. Anti-snap cylinders have a controlled sacrificial break line — they part where they are meant to and leave the internal mechanism intact and locked.
The right grade for each door
Upper-floor flat: standard security cylinder. Ground floor, villa or holiday let: certified cylinder with all three protections. Armoured door: certified cylinder, always paired with a protective escutcheon.
Size matters as much as brand
A cylinder protruding more than three millimetres past the escutcheon is an invitation to snapping — it gives the tool something to grip. The size has to be measured at the door, not estimated. That is why we always measure before fitting.
Is the protective escutcheon worth it?
Nearly always, yes. It is the metal plate that surrounds the cylinder and stops it being gripped. It costs a fraction of the cylinder and, on a ground-floor door, is probably the best-spent euro on the whole door.
What about patented keys?
They come with an ownership card and can only be duplicated by presenting it. It makes sense for holiday lets, offices and apartment buildings — where knowing exactly how many keys are in circulation is half the security.
