In the professional security industry, the 50/50mm offset (100mm total length) is specifically utilized for wider door profiles, often found in high-end residential entrances or commercial suites with thick acoustic padding or decorative cladding. The 50mm Cylinder and Turn configuration is the definitive choice for modern safety; by replacing the internal keyhole with a permanent, ergonomic turn-knob, you ensure that the door can always be opened from the inside—a critical requirement for meeting fire safety and building regulations.

Crafted with high-precision internal components, these 50mm Cylinder and Turn incorporate anti-pick and anti-drill technology. Hardened steel pins are strategically placed to protect the shear line, providing a formidable deterrent against common forced-entry methods while maintaining a smooth, “vault-like” mechanical action for the user.

Why the 50/50mm Thumbturn is the Professional Choice

Symmetrical 100mm Profile: Specifically sized for 54mm–70mm thick doors, ensuring the cylinder sits flush with the handle escutcheon on both sides.
Emergency Egress Convenience: The internal thumbturn allows for “keyless” exit, ensuring occupants are never locked inside during an emergency.
Advanced Anti-Pick Protection: Utilizes specialized pins designed to catch and frustrate picking tools, significantly increasing the time required for unauthorized entry.
Hardened Anti-Drill Defenses: Features strategically placed hardened steel pins within the cylinder body to protect against high-speed drill bits.
Corrosion-Resistant Finishes: Available in Satin Nickel, Polished Brass, or Chrome, ensuring the internal springs remain fluid in all climates.
Keyed to Differ (KTD) Security: Each cylinder is supplied with a unique key code, ensuring individual security for every installation.

Technical Specifications of 50mm Cylinder and Turn

Feature	Specification
Profile Type	Euro Profile (Standard 17mm x 33mm).
Size/Offset	50mm / 50mm (100mm Total).
Internal Operation	Ergonomic Thumbturn (Keyless Exit).
External Operation	Key Entry (3 Keys Included).
Security Features	Anti-Pick / Anti-Drill Hardened Pins.
Material Build	Solid Brass Core with Steel Reinforcement.

Professional Installation and Maintenance Tips

To ensure your 50mm Cylinder and Turn operates with precision for years, follow these essential guidelines:

Check for Protrusion: Even with a 100mm cylinder, the external face should not protrude more than 3mm from the handle or escutcheon. Excessive protrusion makes the lock vulnerable to “lock snapping.”
Alignment is Key: When inserting the cylinder into the mortice lock, slightly turn the thumbturn to align the internal black “cam” with the cylinder body. This allows it to slide into place without force.
The Fixing Bolt Test: Once the central M5 fixing bolt is tightened, test the thumbturn and the key several times. If there is any resistance, slightly loosen the fixing bolt to allow the cylinder to find its natural center.
Dry Lubrication Only: Never use WD-40 or heavy oils. These attract dust which will eventually seize the high-precision pins. Use a dedicated Graphite Powder or dry PTFE-based lock lubricant once a year.
Thumbturn Status: For aesthetics and quick visual checks, ensure the thumbturn is left in the vertical position when the door is locked.

The Standard for Large-Format Door Security

The 50mm Cylinder and Turn is the definitive choice for homeowners and facility managers who require a high-performance lock for oversized or high-specification doors. It bridges the gap between high-level mechanical protection and the practical needs of a busy household. By selecting a precision-engineered 100mm thumbturn, you are investing in a security component that offers peace of mind through engineering excellence.

Enhance your door security with the 50mm Cylinder and Turn, designed for smooth functionality, strength, and reliability. Each lock is supplied with an individual key, ensuring independent access for residential, commercial, and multi-unit applications. The 40/50mm Euro profile size ensures compatibility with a wide range of standard doors, offering an efficient and secure locking solution.

Crafted from robust, high-quality materials, this 50mm Cylinder and Turn is built to resist tampering, forced entry, and everyday use. Its keyed-to-differ feature makes it especially suitable for offices, apartments, and properties that require unique key operation. Simple to install and dependable over time, this 50mm Cylinder and Turn delivers the perfect combination of durability, practicality, and long-term peace of mind.