Tutorial 🕐 4 min read
Lock Classes Explained
Lock classes are a European standard (EN 12209) that rates how well a lock resists theft. Class 1 is the weakest, class 6 is the strongest.
Lock Class Table
| Class | Security | Recommended Use | Example |
|---|---|---|---|
| 1 | Minimal | Basements, garages | Simple bolt lock |
| 2 | Low | Interior door, storage room | Standard cylinder |
| 3 | Medium ★ | Apartment door, building entrance | DOM, Mul-T-Lock basic |
| 4 | High ★★ | House exterior door | EVVA 3KS, Abloy |
| 5 | Very high | Commercial, server rooms | Abloy Protec2 |
| 6 | Maximum | Banks, archives | Special construction |
Which class do I need?
- Apartment door: at least class 3 — a good balance between price and protection.
- House exterior door: class 3–4 — class 4 provides significantly better protection.
- Office/commercial: class 4–5, depending on the contents and insurance requirements.
- Interior room/WC: class 1–2 is fully sufficient.
Security Classes vs Lock Classes — What Is the Difference?
The lock class rates the lock itself. The security class (RC 1–6, formerly WK) rates the entire door assembly — the door, frame, seals and lock together. For apartment doors, RC 2 or RC 3 requirements are often discussed.
Our Recommendation
For most home and apartment doors we recommend a class 3 cylinder lock together with an RC 2 door assembly. Ask us for free advice — we'll help you find the right solution for your door.
Ask for expert advice
Free consultation — we'll tell you which lock class your door needs.
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