STEP 551 is a motor lock with hook bolt for door environments with high-security requirements. The lock can be used as both a night lock and an extremely secure day lock. It is designed for high-frequency door environments.

The lock case is made of stainless steel and has a modern bolt placement with the hook bolt located in the centre of the lock case. This powerful lock can be installed in door environments that are used frequently.

For door environments with the toughest burglary requirements

STEP 551 is one of the most secure motor locks on the market and can be installed in door environments with the most stringent burglary protection requirements. The hook bolt is extremely strong, fast, and can withstand significant stress.

The lock is certified for the highest burglary protection, class 5, according to SSF 3522, as well as Grade 7 according to EN 14846:2008. It can be included as a locking mechanism in many well-reputed security door fittings for class RC3 and RC4.

STEP 551 has an extremely strong hook bolt that is also blocked and locked in the closed position. The breaking strength is 56 kN (5,600 kg). The lock also has a panic lock function.

Evacuation and re-entry

STEP 551 also serves as an evacuation lock in SSF 3522 class 2B when used with STEP Exit emergency exit devices. Certified according to EN 179:2008.

During evacuation, the control unit can manage re-locking or re-entry in several ways that can be customized to the needs of the facility. Continuous re-entry, time-controlled, and/or fire alarm-controlled.

Recovery of the re-entry mode can be done with a key, a reset input, or a reset fire alarm.

For door environments with fire requirements

Certified in fire technical class E/EI120 according EN 14846:2008 in combination with a latch lock.

Manipulation protected barrier

The lock has a double blocking, where the hook bolts block also has a manipulation protected barrier. The barrier’s position is monitored by an optical sensor, ensuring that it is indeed locked. The barrier is completely shielded from access, thus providing protection against tampering.

With unique FreeDrive^® technology

The FreeDrive^® technology enables the locks motor and gearbox to disengages every time the door unlocks mechanically. This means that the wear minimizes when using lever handle, knob, keys or emergency exit device. Locks with FreeDrive^® used together with STEP Exit on doors with emergency exits can therefore be used thousands of times every day

Functional description STEP 551

• The hook bolt locks/unlocks electrically via opening signal from access control system, code lock, push button or similar.
• The hook bolt locks/unlocks mechanically via the cylinder follower.

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