KT-SN

Class 4: Very heavy usage. Hinges for doors that are subject to frequent and heavy usage.

Class 7: 200,000 test cycles (only door hinges)

Class 5: Weight of test door 100 kg

class 0: not suited for use on fire and smoke-retardant doors (EN 1634-1)

The fundamental requirements on the safety of use must be fulfilled by all hinges. That's why there is only class 1 here.

Class 4: 240h salt spray test

Class 1: Suited for use on intrustion-resistant doors based on the rating of the hinges' contribution to intrusion resistance for the respective intrusion-resistant door.

Class 12: Hinges of this class fulfil demands due to very heavy usage