Cross-Key (Cruciform) Cylinders: 4-Way 16-Pin Radial Tumbler Geometry
Engineering Overview: Technical analysis of 4-way cruciform cross-key lock cylinders, evaluating 16-pin radial arrays, anti-picking shear lines, and compact deadbolt drives.
Technical & Engineering Specifications
| Pin Array | 12 to 16 Active Radial Pins (4 Axes) |
|---|---|
| Key Format | 4-Way Plus-Sign Cruciform Cross Key |
| Application | Roller Shutters, Heavy Rim Deadbolts, Safes |
| Body Diameter | 22 mm Compact Cylindrical Housing |
| Pick Resistance | Extremely High (Requires 4-axis simultaneous tension) |
4-Way Radial Pin Architecture
Cross-Key Cylinders (Cruciform Cylinders) utilize a plus-sign shaped key blade with bitting cuts distributed across 4 orthogonal planes (90° spacing).
High-Density Tumbler Matrix
- 12 to 16 Active Pins: 3 to 4 pin chambers positioned along each of the 4 radial axes.
- Extreme Pick Resistance: Covert picking requires holding rotational tension while picking 4 independent shear lines simultaneously, defeating standard lock picks.
- Application: Compact perimeter rim locks, roller shutter center locks, and safe deposit boxes.
Frequently Asked Engineering & Selection Questions
Q1: How do cruciform cross-key cylinders work?
They have locking pins arranged in 4 radial rows around a cross-shaped keyway, requiring all 4 rows to be picked simultaneously to turn the lock.