T-Pins (Stepped Pins): Asymmetric Shoulder Trapping in False Sets
Engineering Overview: Engineering breakdown of T-shaped stepped driver pins, analyzing asymmetric shoulder binding and counter-rotation under lock pick manipulation.
Technical & Engineering Specifications
| Material | Solid Hardened H59 Brass |
|---|---|
| Pin Format | Asymmetric T-Shaped Stepped Driver Pin |
| Anti-Attack Rating | High-Grade Covert Manipulation Defense |
| Chamber Compatibility | Counter-Bored Precision Chambers |
Asymmetric Step Kinematics
T-Pins (Stepped Pins) feature an asymmetric T-shape with a narrow stem and a wide top hat shoulder ($\Phi 2.4 ext{ mm}$ expanding to $\Phi 2.8 ext{ mm}$).
Deep Shoulder Binding
When picked, the narrow stem drops past the shear line, causing the wide top hat shoulder to wedge firmly against a counter-bored lip inside the plug chamber. Clearing the pin requires extreme counter-rotation that resets all other picked pins.
Frequently Asked Engineering & Selection Questions
Q1: What is a T-pin in a lock cylinder?
A driver pin shaped like the letter T whose wide top shoulder drops into a deep trap when picked, requiring a full reset of all other pins to escape.