A 55mm euro profile single cylinder differs from standard double cylinders by having a shortened, solid “blind” end. The 55mm total length is specifically designed for applications where the external face of the door is thicker or where the locking mechanism is offset.

Why the 55mm Length is Essential

Deep-Stile Gates: For heavy timber or composite gates, a standard 40mm half-cylinder is often too short to reach the external handle face. The 45mm external offset of this cylinder ensures the keyway sits flush, preventing the need to “dig out” the timber.
Insulated Roller Shutters: Modern industrial shutters often feature thick, foam-filled slats. The 55mm barrel provides the necessary reach to pass through the slat and engage with the internal locking bar.
Panic Bar Overrides: Most commercial panic bars (push bars) are operated internally by the bar itself, but require an external key override. A 55mm single cylinder is the standard size for many high-traffic emergency exit systems.
Adjustable Cam Performance: High-quality 55mm cylinders often feature a multi-position cam. This allows the internal actuator to be set at various angles (30°, 45°, 90°, etc.) to match the specific “throw” required by different brands of garage door locks.

Precision Sizing: The 45/10 Asymmetric Split

A 55mm euro profile single cylinder is almost universally measured as a 45/10 configuration. The 10mm “blind” side is a fixed mechanical standard required to house the rotating cam and the fixing screw point.

Side A (External Keyway)	Side B (Internal Blind)	Total Length
45mm	10mm	55mm

Pro-Tip: When measuring, always measure from the center of the fixing screw to the outside edge of the door handle. If that distance is 45mm, this cylinder will sit perfectly flush. If it is longer, you may need a 50/10 or 60/10 variant.

Technical Specifications of 55mm euro profile single cylinder

Feature	Detailed Specification
Cylinder Type	Single / Half (Keyed one side only)
Security Rating	BS EN 1303 Grade 6 (Highest Security)
Pin Configuration	6-Pin High Security (Anti-Pick)
Protection Tech	Anti-Drill, Anti-Pick, Anti-Bump
Material	Solid Brass (Available in Satin Nickel, Chrome, or Brass)

Recommended 55mm Single Cylinders

For high-use commercial shutters or premium garage doors, the 55mm euro profile single cylinder is an exceptional choice. Its 10-pin system provides superior pick resistance and can be integrated into a Master Key System, allowing one key to open your front door, garage, and garden gate.

For standard residential gates or internal storage cupboards, the ERA 6-Pin Single Cylinder (available in 45/10) offers a robust, cost-effective solution. It features hardened steel anti-drill pins and a mushroom driver system that resists picking and bumping, ensuring long-term reliability in external environments.

Maintenance for Longevity

Since single cylinders are often used on external gates or garages, 55mm euro profile single cylinder are exposed to more dust and moisture than internal locks. Never use oil or WD-40, as these attract grit that can jam the delicate internal pins. Instead, use a dry PTFE spray or graphite powder once a year to keep the key operation smooth and responsive.

Secure your doors with the 55mm euro profile single cylinder, designed for reliable locking, smooth operation, and long-lasting durability. Each cylinder operates with its own unique key, making it ideal for residential, commercial, and multi-unit properties. The 55mm Euro profile provides a precise and secure fit for standard doors, offering practical and dependable security.

Crafted from high-quality materials, the 55mm euro profile single cylinder is built to resist tampering, forced entry, and daily wear, ensuring consistent long-term performance. Its keyed-to-differ feature allows each cylinder to function independently, making it suitable for offices, apartments, and multi-door installations. Easy to install and designed for everyday use, this cylinder lock combines strength, convenience, and peace of mind.