Rim Lock Cylinders: Rear Screw Tailpiece Engagement for Surface-Mounted Nightlatches
Engineering Overview: Technical overview of rim cylinders with breakable flat tailpieces engineered for surface-mounted nightlatches and panic exit rim devices.
Technical & Engineering Specifications
| Mounting | Twin Rear M4 Screws (45-70mm) |
|---|---|
| Application | Nightlatches, Surface Rim Devices |
| Cylinder Type | Rim Cylinder for Surface Locks |
| Face Diameter | 34.0 mm Outer Flange |
| Tailpiece Spec | Segmented Hardened Steel Flat Bar (5mm notches) |
Mechanical Form Factor
A Rim Cylinder is designed for surface-mounted nightlatches, rim deadbolts, and panic exit rim devices. It features a circular brass face ($\Phi 34\text{ mm}$) and mounts via two rear M4 fixing screws passing through the interior mounting plate.
Flat Tailpiece Torque Transmission
Torque is transmitted to the lockcase via a hardened flat steel tailpiece (connecting bar) extending from the plug:
- Breakable Notches: Pre-notched at 5 mm increments, allowing installers to snip the bar to exact door thicknesses (35 mm to 65 mm).
- Free Rotation: Operates a 360° spring-back nightlatch mechanism without key entrapment.
Frequently Asked Engineering & Selection Questions
Q1: How do you adjust a rim cylinder tailpiece length?
The flat steel tailpiece features pre-milled score notches, allowing installers to snap or cut the tailpiece to match door thickness.