Hardened Steel Anti-Drill Dowel Pins in Cylinder Housings and Plug Cores
Engineering Overview: Technical analysis of hardened 62 HRC steel dowel pins pressed into cylinder bodies and plugs to defeat high-speed drilling attacks.
Technical & Engineering Specifications
| Hardness | 62 - 64 HRC |
|---|---|
| Standard | EN 1303:2015 Attack Grade D / SKG*** 3-Star |
| Pin Material | Case-Hardened 40Cr / GCr15 Bearing Steel |
| Placement Array | 2x Body Face Pins + 2x Plug Flank Pins |
Anti-Drill Barrier Engineering
Unprotected brass cylinder bodies can be drilled open in seconds. High-security cylinders embed case-hardened steel dowel pins (60–64 HRC) directly across drilling attack paths.
Multi-Zone Dowel Placement
- Body Face Dowels: Two vertical $\Phi 2.0 ext{ mm} \times 12 ext{ mm}$ hardened steel pins pressed in front of Pin Chamber 1.
- Plug Core Dowels: Two diagonal pins flanking the keyway entry slot.
- Drill Bit Destruction: When a high-speed drill bit encounters the hardened dowel, the hardness differential creates extreme lateral deflection and shears the drill bit cutting tip.
Frequently Asked Engineering & Selection Questions
Q1: How do anti-drill dowel pins protect a lock cylinder?
They are case-hardened to 62+ HRC, which is harder than standard drill bits, deflecting and breaking drill bits before they reach the shear line.