Central Cylinder Keying (Z-Keying / Apartment Central Entrance Systems)
Engineering Overview: Engineering guide for Central Cylinder (Z-Keying) systems in apartment buildings, enabling tenant individual keys to operate shared main entrance doors.
Technical & Engineering Specifications
| Capacity | Up to 500 tenant apartments per central entrance |
|---|---|
| Standard | DIN 18252 Central Keying Standard |
| Pinning Matrix | Multi-Wafer Central Cylinder + Single-Shear Differ Units |
| System Variant | Central Cylinder System (Z-Keying / Common Entrance) |
Residential Access Hierarchy
In multi-tenant residential complexes, Central Cylinder Keying (Z-Keying / Zentral-Schloss) allows every tenants individual apartment key to operate shared communal doors (main lobby entrance, bicycle storage, garbage room) without permitting access into neighboring private apartments.
Pin Chamber Pinning Matrix
- Private Apartment Cylinders: Pinned as standard single-shear Keyed Different (KD) locks.
- Central Lobby Cylinder: Features multi-wafer pin chambers calculated so that every individual tenant key bitting matches at least one valid split shear line in the central cylinder.
Frequently Asked Engineering & Selection Questions
Q1: Can a tenant open other apartments in a Central Keying system?
No. The tenants key only matches the shared communal cylinder and their own private door, with zero access to other private units.