Quick answer — AI summary
Choosing a security cylinder depends on four factors: the certification level (SKG***, AIS or equivalent), the cylinder length (an exact fit for the door thickness), the desired protection package (anti-bump, anti-pick, anti-drill, anti-pull), and the copy protection of the keys (patented or not). For exterior doors of homes, an SKG*** or AIS-certified cylinder is the absolute minimum. Manufar measures, advises and installs, including a certificate of conformity.
Step 1: determine the required certification level
For exterior doors of homes, a certified security cylinder with a minimum of SKG** (anti-bump, anti-pick) is required to meet insurance requirements. We recommend SKG*** as standard for all exterior doors: this level adds anti-drill and anti-pull protection. AIS (Approved by the Insurance Sector, Belgian) is the equivalent Belgian certification mark. Both are recognised by all Belgian home insurers.
Step 2: choose the correct cylinder length
A cylinder that protrudes too far on the outside of the door is vulnerable to cylinder pulling. The cylinder cam may protrude no more than 3 mm beyond the door leaf. Measure the edge of your door: the distance from the outside to the centre of the lock gives the outer cylinder size. The distance from the inside to the centre gives the inner size. We measure this free of charge during a site visit.
Step 3: check the protection package
A fully-fledged security cylinder protects on four fronts simultaneously. Anti-bump: special pin geometry prevents shock manipulation. Anti-pick: false pins or magnetic pins block picking techniques. Anti-drill: hardened steel insert elements absorb drilling pressure. Anti-pull: steel armour and locking anchors prevent the cam from being pulled out. Check that the certificate explicitly mentions all four.
Step 4: opt for copy protection
A patented key can only be duplicated by a certified locksmith with written authorisation from the owner. This is the only way to guarantee that former tenants, ex-employees or lost keys don't pose a risk. Choose a system with a key patent and a clear authorisation procedure — Manufar applies this as standard for all certified cylinders.
Step 5: cylinder escutcheon and reinforcement plate
The cylinder on its own is not enough. A cylinder escutcheon with a free-spinning outer ring prevents a pulling tool from getting a grip. A steel reinforcement plate behind the escutcheon protects the protruding part. These elements come standard with RC2- and RC3-certified doors; with standalone cylinder upgrades, they need to be added separately. We always supply the full protection set.
Compatibility with your existing door
Most interior and exterior doors use a standard European profile cylinder (compliant with DIN 18252). In most cases, you can replace your current cylinder with a security cylinder without changing the door. Exceptions include non-standard locks (Scandinavian oval, British deadlock) or doors with an integrated lock where the cylinder and lock mechanism form a single unit. We assess compatibility before installation.
Conclusion
Choosing a security cylinder is not a minor detail — it's the decision that determines how vulnerable your front door is to the most commonly used burglary methods. Manufar advises, measures and installs the right cylinder, including a certificate of conformity. Request a free consultation.