Anti-Pick Spool Pins: False Shear Line Engagement and Counter-Torque Mechanics
Engineering Overview: Technical analysis of spool top driver pins, false set angles, and counter-rotation physics defeating single-pin lock picking.
Technical & Engineering Specifications
| Material | Hardened Extruded H59 Brass / SUS304 |
|---|---|
| Security | Defeats Single-Pin Picking & Raking |
| Standard | EN 1303:2015 Grade 6 |
| Pin Profile | Symmetrical Spool (Dumbbell) Driver Pin |
| Waist Undercut | 1.80 mm Narrowed Center Lip |
Covert Lock Picking Defense
Standard cylindrical top pins bind sequentially under rotational torque, enabling single-pin picking (SPP). Spool Pins (Dumbbell Pins) completely neutralize this attack.
False Shear Line Mechanics
- Waist Undercut: The center of the spool pin is narrowed to $\Phi 1.8 ext{ mm}$ with full $\Phi 2.4 ext{ mm}$ outer lips.
- False Set Trap: When picked, the narrow waist slips across the shear line, rotating the plug into a false set angle.
- Counter-Rotation: To lift the spool further, the picker must force the plug to rotate backwards, dropping all other set pins.
Frequently Asked Engineering & Selection Questions
Q1: What is a false set in lock picking?
It is when a spool pin waist catches in the shear line, rotating the plug slightly but mechanically locking it until counter-rotated.