DIN 18251 Mortise Lockcase Cutout Standardization: 17mm x 33mm Teardrop Limits
Engineering Overview: Technical guide on German DIN 18251 mortise lockcase dimensions and profile cylinder cutout tolerances (17mm x 33mm).
Technical & Engineering Specifications
| Fixing Hole | M5 x 0.8 mm Thread at 10.0 mm Centerline |
|---|---|
| Cylinder Profile | DIN 18252 Teardrop (17 mm x 33 mm) |
| Interoperability | 100% Universal Fitment across European Lock Brands |
| Standard Reference | DIN 18251 (Locks - Mortise Locks for Doors) |
German DIN Dimensional Standardization
DIN 18251 standardizes mortise lockcase dimensions to ensure universal interoperability with DIN 18252 Euro profile cylinders.
Standard Cutout Tolerances
- Teardrop Cavity: Height $33.0 ext{ mm} \pm 0.2 ext{ mm}$, upper circle $\Phi 17.0 ext{ mm} \pm 0.1 ext{ mm}$, waist width $10.0 ext{ mm} \pm 0.1 ext{ mm}$.
- Screw Fixing Distance: Center of cylinder profile to M5 screw hole $= 10.0 ext{ mm}$.
Frequently Asked Engineering & Selection Questions
Q1: What are the standard dimensions of a DIN Euro profile cylinder cutout?
A 17 mm upper circle, 10 mm central waist, and 33 mm overall height with a central M5 retaining screw hole.