What Is a Euro Cylinder Lock?
A euro cylinder is a standardized, barrel-shaped lock housing an internal pin-tumbler mechanism. When a key is inserted, it aligns internal pins, enabling a revolving central cam to throw or retract the door’s locking bolts.
Because the profile shape is standardized across manufacturers, replacing or upgrading a euro cylinder is straightforward—provided the replacement is accurately measured and correctly fitted.
Types of Euro Cylinder Locks
Selecting the correct euro cylinder depends on operational requirements and door usage.
Euro Cylinder Type
Key Operation
Common Application
Key Advantage
Double (Key-to-Key)
Key access from both outside and inside.
External residential front & back doors.
High security; prevents unauthorized interior operation if glass is breached.
Thumbturn & Key
Key outside; internal rotating thumbturn knob.
Flats, communal doors, fire egress routes.
Keyless internal egress during emergencies; instant locking convenience.
Half Euro Cylinder
Key access from one side only (blank rear).
Garage doors, patio sliders, key-switch boxes.
Compact, single-sided protection where dual access is unneeded.
Key-to-Key Euro Cylinders
Standard double euro cylinders require a key for operation from both the interior and exterior sides. They provide robust perimeter security for standard entry doors.
Thumbturn and Key Cylinders
Thumbturn cylinders feature a keyway on the exterior and an ergonomic turning knob on the interior. This design allows immediate exit in emergencies without searching for keys, making it ideal for multi-occupancy properties and fire escape doors.
Half Euro Cylinders
Measuring half the length of a standard barrel, these cylinders operate from a single direction. They are commonly installed on garage doors, commercial shutter switches, and key-operated security posts.
Are Euro Cylinder Locks Secure?
Standard, unrated euro cylinders can be vulnerable to forced entry techniques such as lock snapping, picking, drilling, and bumping. Lock snapping involves applying force to the exposed outer barrel, snapping the cylinder at its central fixing hole to manipulate the cam.
Modern high-security cylinders prevent this vulnerability through integrated defensive engineering:
- Sacrificial Snap Lines: Engineered break points that snap off under force, keeping the central mechanism intact and locked.
- Anti-Drill Steel Pins: Hardened steel inserts that deflect and dull drill bits.
- Anti-Pick & Anti-Bump Features: Specialized spool pins and internal side-bars that render picking and bump keys ineffective.
Understanding TS007 3-Star and SS312 Security Ratings
When evaluating high-security euro cylinders, two recognized UK standards dictate attack resistance:
- TS007 3-Star Kitemark: The benchmark standard for cylinder security. Achieved either via a standalone 3-star cylinder or a 1-star cylinder paired with a 2-star rated security handle.
- SS312 Diamond Approved: Awarded by Sold Secure (Master Locksmiths Association), this rigorous test specifically certifies maximum resistance against lock snapping attacks.
How to Measure a Euro Cylinder
Correct sizing is essential. A cylinder that protrudes more than 3mm beyond the external door handle backplate can create a leverage point for snapping tools. For additional information about PIP Lockout and our locksmith services, you can also view our The Lifestyle Card business listing.
To determine your required cylinder size:
- Open the door and locate the central cylinder retaining screw on the door edge.
- Measure from the centre of the screw hole to the outside edge of the handle backplate (External Dimension A).
- Measure from the centre of the screw hole to the inside edge of the handle backplate (Internal Dimension B).
- Combine the figures (e.g., 40mm external / 45mm internal = 40/45 or 85mm overall).
Euro Cylinder Locks in Andover
PIP Lockout provides professional euro cylinder supply, measurement, and fitting across Andover Town Centre, Charlton, Enham Alamein, Anna Valley, Picket Piece, Abbotts Ann, and the broader Test Valley region. Whether upgrading a uPVC patio door to anti-snap protection or replacing a tenant’s barrel lock, our technicians ensure correct measurement and flush fitting.
Need advice on selecting or replacing a euro cylinder lock in Andover? Contact PIP Lockout today to schedule a professional lock fitting or security evaluation.
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