Heavy‑duty mechanical lock with extremely strong hook bolt
With STEP H51 you no longer have to compromise with the intrusion security. The hook bolt is extremely strong with a breaking strength of 56 kN (5,600 kg). This makes the lock very difficult to force and will ensure high security in your door environment.
- Certified for burglary protection in Class 5 acc. to SSF 3522.
- Certified for burglary protection in Class 7 acc. to EN 12209.
Replacement guide
STEP H51 corresponds to ASSA 511.
360° turn
A key or magnetic tumb turn pulls in/out the hook bolt from both the doors interior and exterior side, with a 360° turn.
For door environments with fire requirements
Certified for fire resistance in Grade 1 (E/EI120) acc. to EN 12209, in combination with a latch lock.
Create an electrical lock/unlockning solution
If you combine STEP H50 with electric strike STEP 18 Secure, you can create a smooth passage with electric locking/unlocking.
Fine material choises
The hook bolt is made of hardened steel with a surface treatment of chemical nickel plating to achieve the highest quality and function. The lock case face plate is made of stainless steel.
With or without microswitches
Choose between a version with microswitches (H51M) or without (H51), depending on your needs.
For door environments with the highest intrusion security requirements
- Day lock position in high security doors and perimeter locking.
- Perfect for shop entrances, restaurants, apartment doors, storage areas etc. where a mechanical lock is appropriate.
- Combine with electric strike STEP 18 Secure to create a smooth passage with electric locking/unlocking in prisons, prisons, industries and office premises, etc.
Swedish premium quality
All our products are developed and manufactured by us in Sweden. Maximum functionality and operational reliability are features we never compromise on. By choosing STEP, you not only support Swedish technology and industry – you also choose premium-quality products that ensure long-term reliability.
STEP H51 Mechanical hook bolt lock case
Mechanical hook bolt lock case for door environments with absolute highest intrusion security
With STEP H51, you can ensure the highest level of intrusion protection. Equipped with an exceptionally strong hook bolt with a breaking strength of 5 600 kg, this lock is suitable for all types of security doors and perimeter protection doors where an approved locking unit is required. Combine it with STEP electric strikes to create an electric locking/unlocking solution.Mechanical hook bolt lock case with hook bolt. For doors with high-security requirements. Certified in Class 5 acc. to SSF 3522.
Functional description
- The hook bolt locks/unlocks via cylinder position with 360° rotation from both the interior and exterior side.
Certificates
- Certified for burglary protection in Class 5 according to SSF 3522.
- Certified for burglary protection in Class 7 according to EN 12209.
- Certified for fire resistance in Grade 1 (E/EI120) according to EN 12209 in combination with a latch lock.
- Certified for durability in Grade C according to EN 12209.
- Certified for corrosion and humidity in Grade G (which corresponds to very high requirements) according to EN 12209.
Product characteristics
- Modern bolt placement.
- Backset 50 mm.
- Reversible to fit both right and left hung doors.
- 56 kN (5 600 kg) breaking strength.
- For round and oval Scandinavian cylinders.
- Lock case face plate in stainless steel.
- Hook bolt in hardened steel with a surface treatment of chemical nickel plating.
- Available with or without microswitch.
- Microswitch unipolar changeover, max. 30 V DC, 1A.
- Combine with electric strike STEP 18 Secure (12 mm) to create a electric locking/unlocking solution.
- If using thumb turn, a magneticthumb turn must be used.
- Unsurpassed quality.
- Developed and produced in Västerås, Sweden.
- Patent pending.
- Environment
- The lock can withstand temperatures from -20 to +70 degrees.
