Cylinder lock insert with knob GERDA GAŁKA 30-40 mm brass

GERDA GAŁKA cylinder lock insert with knob in brass finish is a mechanical door lock cylinder designed for doors that require knob operation on the interior side. The insert fits cylinders with an overall size range of 30–40 mm and serves as a component of a locking system to allow key access from the outside and knob operation from the inside. It is intended for use as a replacement part or an upgrade when converting a standard cylinder to a knob-operated version.

Advantages

The brass finish offers corrosion resistance and a consistent appearance that matches traditional door hardware. The knob-equipped insert simplifies operation from the inside, enabling quick locking and unlocking without a key while maintaining secure keyed access from the exterior. The unit is compact and compatible with doors that accept a 30–40 mm cylinder, allowing straightforward installation in common residential and commercial door lock assemblies.

Suitable for

• Entrance doors where interior knob operation is preferred
• Interior doors that require keyed access from one side
• Replacement or retrofit of existing cylinder locks sized 30–40 mm
• Residential and light commercial properties

Key specifications

• Type: Cylinder lock insert with interior knob
• Size compatibility: 30–40 mm overall cylinder length
• Finish: Brass
• Operation: Keyed access from exterior, knob operation from interior
• Application: Mechanical access control for door lock units

How to use

Measure the existing cylinder length to confirm compatibility with a 30–40 mm insert before starting. Remove the existing cylinder according to the door lock manufacturer’s instructions, insert the GERDA GAŁKA cylinder insert into the lock case and secure it following the lock manufacturer's fastening method. From the interior side the knob provides manual rotation to lock and unlock; from the exterior, operate using the matching key. Ensure the cylinder is correctly aligned and that the door operates smoothly after installation.

Usage recommendations

For reliable performance, verify compatibility with your door and lock hardware prior to purchase. If uncertain about removal or installation procedures, consult a qualified locksmith or refer to the door lock manufacturer’s guidelines. Periodically inspect and lubricate the cylinder with a graphite or silicone-based lubricant suitable for locks to maintain smooth operation and reduce wear.