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 center 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 doors with fire safety requirements
Certified in fire resistance class E/EI120 according to EN 14846:2008 in combination with a latch lock.