Pin Bitting Tolerances: +/- 0.015mm CNC Cutting Precision Standards
Engineering Overview: Technical specifications for CNC key cutting and pin broaching tolerances, evaluating shear line clearances and key smoothness.
Technical & Engineering Specifications
| Standard | ISO 2768 Precision Fine / DIN 18252 |
|---|---|
| Tolerances | CNC Key Cuts +/- 0.015 mm / Pins +/- 0.005 mm |
| Surface Roughness | Ra < 0.4 um Internal Chamber Finish |
| Diametral Clearance | 0.030 mm Optimal Shear Clearance |
Sub-Mil Tolerancing in Lock Manufacturing
Smooth key operation and high pick resistance depend on exact manufacturing tolerances:
- Pin Diameter: $\Phi 2.40 ext{ mm} \pm 0.005 ext{ mm}$.
- Chamber Bore: $\Phi 2.43 ext{ mm} \pm 0.005 ext{ mm}$ ($0.03 ext{ mm}$ diametral clearance).
- CNC Key Cut Depth: Machined to $\pm 0.015 ext{ mm}$.
Tighter tolerances prevent cylinder plug wobbling while ensuring effortless key insertion over 100,000 operational cycles.
Frequently Asked Engineering & Selection Questions
Q1: Why are tight pin tolerances important in lock cylinders?
Tolerances within +/-0.015 mm prevent lock picking, eliminate key binding, and ensure the lock operates smoothly over 100,000 cycles.