Selecting Cylinder Escutcheons: Bolt-Through vs Surface Screw Armored Roses
Engineering Overview: Technical comparison of bolt-through armored security escutcheons versus surface screw roses, evaluating resistance to crowbar prying.
Technical & Engineering Specifications
| Standard | PAS 24 / BS 3621 Security Handle Standard |
|---|---|
| Fasteners | Twin M6 High-Tensile Steel Through-Bolts |
| Protection | Resists crowbar prying and mole grip clamping |
| Escutcheon Types | Bolt-Through Armored Security Rose vs Surface Screw |
Security Escutcheon Anchoring
A high-security cylinder requires a matching security escutcheon (rose) to protect against snapping.
Mounting Styles
- Surface Screw Escutcheons: Fastened with wood screws from outside. Prone to being pried off with screwdrivers in seconds.
- Bolt-Through Armored Roses: Heavy solid steel roses fastened via twin M6 through-bolts from the interior door face, withstanding over 10 kN prying force.
Frequently Asked Engineering & Selection Questions
Q1: Why are bolt-through escutcheons safer than surface-screwed roses?
Bolt-through escutcheons are bolted from inside the house with heavy M6 steel bolts, so burglars cannot pry them off from the outside.