Side-Bar Locking Mechanisms: Secondary Sidebar Verification in High-Security Cores
Engineering Overview: Engineering breakdown of secondary side-bar locking mechanisms, detailing true and false slider gates and rotational plug deadlocking.
Technical & Engineering Specifications
| Gates | True Gates with Anti-Pick False Gates |
|---|---|
| Standard | EN 1303:2015 Attack Resistance Grade D |
| Mechanism | Dual Pin Tumbler + Hardened Steel Side-Bar |
| Pick Resistance | Immune to standard bump keys and pick guns |
| Sidebar Material | Hardened 40Cr Alloy Steel (60 HRC) |
The Dual-Verification Principle
High-security cylinders supplement standard pin tumblers with an independent Side-Bar Locking Mechanism.
Mechanical Operation
- Solid Steel Side-Bar: A hardened steel bar ($1.5\text{ mm} \times 25\text{ mm}$) sits in a groove along the side of the cylinder plug, protruding into the body housing to mechanically block rotation.
- Slider Alignment: Inserting the correct key positions internal rotating wafers or sliders so their true gates align precisely with the side-bar teeth.
- Sidebar Retraction: When aligned, rotational torque forces the side-bar into the slider gates, allowing free plug rotation.
Frequently Asked Engineering & Selection Questions
Q1: How does a side-bar lock prevent picking?
Even if the top and bottom pins are picked to the shear line, the solid steel side-bar physically deadlocks the plug until all sliders are aligned.