The reliability of an entrance door doesn’t start with steel thickness — it starts with the lock.
The lock is the first target for intruders and the key element protecting an apartment, private house, or commercial property.
The most common lock types on the market are cylinder locks, lever (mortise) locks, and combined systems. In this article, we’ll explain how they differ, their strengths and weaknesses, and which option truly offers the best protection for an entrance door.
Why Choosing the Right Lock Really Matters
Even the strongest metal door won’t be secure if:
- a weak or outdated lock is installed
- only one locking system is used
- the lock is chosen without considering real usage conditions
A high-quality lock:
- slows down and complicates break-in attempts
- discourages intruders
- increases real security, not just “on paper”
Cylinder Locks: Convenience and Flexibility
How Cylinder Locks Work
The core of a cylinder lock is a cylinder (core) with pins that align into the correct position when the proper key is inserted.
Advantages of Cylinder Locks
- convenient for everyday use
- cylinder can be replaced without changing the entire lock
- wide range of security levels
- support for modern protection technologies (anti-bumping, anti-drilling)
Disadvantages
- vulnerable if low-quality cylinders are used
- basic models may be susceptible to non-destructive lock picking
When They Are a Good Choice
Cylinder locks are suitable for:
- apartments
- private houses
- offices and commercial spaces
Important: the security of a cylinder lock depends primarily on the quality of the cylinder, not just the lock body.
Lever (Mortise) Locks: Classic Mechanical Security
How Lever Locks Work
Inside the lock are metal plates (levers) that must align precisely when the key is turned.
Advantages of Lever Locks
- high mechanical reliability
- strong resistance to force-based attacks
- long service life
- difficult to break into quickly
Disadvantages
- large, less convenient keys
- losing a key often requires replacing the entire lock
- limited flexibility in access management
When They Are a Good Choice
Lever locks are often chosen for:
- apartment entrance doors
- technical or utility rooms
- situations where mechanical strength is the top priority
Combined Locks: Maximum Protection
What Is a Combined Locking System?
A combined system uses two different lock types in one door — most commonly:
- cylinder lock + lever lock
Why This Is the Best Option
An intruder must use two completely different breaking methods, which:
- significantly increases break-in time
- raises the risk of being noticed
- often causes the intruder to abandon the attempt altogether
Disadvantages
- higher cost
- more complex construction
When to Choose Combined Locks
Combined systems are the optimal choice for:
- apartments in multi-storey buildings
- private houses
- properties with increased security requirements
Lock Security Classes Explained
When choosing a lock, always check its security class:
- Class 1–2 — minimal protection (not recommended for entrance doors)
- Class 3 — basic protection level for apartments
- Class 4 — high security, recommended for entrance doors
For metal entrance doors, Class 3 or 4 locks are the optimal choice.
Common Lock Myths
Myth 1: An expensive lock cannot be broken
Reality: any lock can be broken — the real question is how long it takes.
Myth 2: One good lock is enough
Reality: two different lock types provide significantly higher security.
Myth 3: All cylinder locks are the same
Reality: up to 70% of security depends on the cylinder quality.
Locks Used in Estdoor Entrance Doors
In Estdoor entrance doors, proven locking systems are used based on:
- type of property
- security requirements
- everyday usability
Most often, a combined system (cylinder + lever lock) is recommended as the most balanced and reliable solution.
Final Verdict: Which Locks Are Best?
- Cylinder locks — convenient and flexible, provided a high-quality cylinder is used
- Lever locks — strong and durable, but less convenient
- Combined locks — the best choice for maximum security
If security truly matters, cutting costs on locks is a mistake.
The lock is the core element protecting your home.
