GERDA Brass Cylinder Lock with Knob 40/40mm, 3 Keys

The GERDA brass cylinder lock with a knob is a high-quality security component designed for residential and commercial doors. With a symmetrical 40/40mm dimension, this cylinder offers a precise fit for standard door thicknesses. The integrated thumbturn on the inside allows for quick and convenient locking or unlocking without the need for a key, providing both safety and ease of use in daily life.

Advantages

This cylinder lock is constructed from durable brass, which provides excellent resistance to mechanical wear and environmental factors. The inclusion of a thumbturn significantly enhances user convenience, allowing for rapid exit or secure locking from the interior. Its robust design ensures smooth operation over long periods, maintaining consistent performance and reliability for your door security system.

Suitable for

• Residential entry doors
• Office and commercial interior doors
• Doors requiring quick interior locking mechanisms
• Replacement of standard euro-profile cylinders

This cylinder may not be suitable for doors with non-standard thicknesses that deviate significantly from the 40/40mm configuration. It is also not intended for use on doors requiring high-security anti-drill or anti-snap certifications beyond standard residential protection levels.

Key specifications

• Size: 40/40mm
• Material: Brass
• Operation: Thumbturn on one side, key on the other
• Included: 3 keys
• Compatibility: Standard euro-profile mortise locks

To install the cylinder, remove the existing fixing screw from the edge of the door, slide out the old cylinder, and insert the new GERDA unit. Ensure the cam is aligned correctly to allow the cylinder to slide into the lock body. Once inserted, re-secure the fixing screw through the door edge and test the operation with both the key and the thumbturn while the door is open.

What to consider before purchase

• Measure your current door thickness and the distance from the center of the fixing screw to both sides of the door.
• Verify that your existing mortise lock is compatible with euro-profile cylinders.
• Ensure the 40/40mm size matches your specific door requirements.

For optimal performance, avoid using excessive force when turning the key. If the mechanism feels stiff, a light application of a specialized graphite-based lubricant can be used to maintain smooth operation.