Euro Thumbturn Cylinder

Standard Profile Cylinder for Commercial & Residential Mortise Locks

Selecting the correct cylinder length and cam position prevents installation failures and security vulnerabilities on site.

Standard Overall Lengths (A / B): Available from 60mm (30/30) up to 100mm (50/50), with asymmetric increments of 5mm (30/35, 35/40, etc.).

Cam Position: Fixed at 30° upward resting position (standard European DIN specification for mortise locks).

Thumbturn Types: Standard ergonomic grip, oval bar, or T-bar profile designed for high-frequency operation without finger clearance issues.

Engineered for seamless integration into standard European mortise lock bodies across multiple sectors:

Multi-Family Residential: Entrance doors requiring rapid interior egress via thumbturn without searching for keys during emergencies (pairs with our standard Mortise Lock Bodies).

Commercial Offices: Interior partition doors and server rooms requiring strict access hierarchies via Master Key systems.

Fire-Rated Doors: Certified for use on wooden and hollow metal fire doors when paired with fire-rated mortise latches (EN 1634-1 compliant up to 90 minutes).

Material & Forging Integrity
• Solid Brass Extrusion: Cylinder bodies and plugs are hot-forged and precision CNC-machined from solid high-grade brass bars. Avoids porous die-cast zinc alloys that degrade under torque stress.
• Hardened Steel Anti-Drill Pins: Strategic placement of tungsten carbide or hardened steel insertion pins across the shear line protects against direct drill attacks.

Internal Mechanism & Tolerance Control
• Precision Pin Stacking: CNC multi-axis drilling maintains pin-hole tolerances within plus or minus 0.01mm, ensuring smooth key insertion and preventing jamming over extended service life.
• Anti-Snap Weak Point Control: Optional sacrificial break-lines allow the outer portion of the cylinder to snap off during a physical attack while keeping the internal mechanism intact and operational from the inside via the thumbturn.

Surface Treatment & Plating Process
• Electroplating Specification: Multi-layer galvanic coating comprising copper base layer, nickel intermediate layer, and final finish layer. Tested via 96-hour NSS (Neutral Salt Spray) to resist oxidation in coastal and humid environments.

Every production batch undergoes rigorous laboratory testing before packaging:

Torque Resistance Testing: Subjects the plug and cam to torsional stress exceeding EN 1303 limits (15 Nm) to prevent shearing under wrench attacks.

Cycle Endurance Testing: Automated rigs cycle the key and thumbturn past 100,000 operations under rated spring loads.

Gauge Inspection: 100% optical and mechanical Go/No-Go gauge verification of keyway dimensions, cam alignment, and fixing screw hole spacing.

To request project-specific quotations, engineering evaluations, or sample kits for your distribution network, contact our technical sales team with your exact dimensions, keying requirements, and finish specifications.