Smart lock cylinder NUKI Cisa Astral S 40/40 — mechanical profile 40/40

NUKI Cisa Astral S 40/40 is a mechanical lock cylinder with a symmetric 40/40 euro-profile length designed for standard door locking systems. It offers a straightforward mechanical solution for residences or commercial premises that require a 40 mm length on both sides, enabling direct replacement or installation in compatible euro-profile locks. The cylinder is intended to fit typical euro-profile door hardware and to provide reliable mechanical operation for everyday locking and unlocking.

Advantages

The cylinder’s symmetric 40/40 profile simplifies selection and installation where identical side lengths are required. As a mechanical euro-profile cylinder, it is compatible with many standard lock cases and fittings, allowing easy replacement without modifying the door or lock body. The design focuses on stable mechanical performance and straightforward operation for keyed access.

Suitable for

• Residential front doors with euro-profile locks
• Apartment and flat entry doors requiring a 40/40 cylinder
• Commercial interior doors using standard euro-profile cylinders
• Replacement of worn or non-functioning 40/40 mechanical cylinders

Key specifications

• Profile type: Euro-profile cylinder
• Length configuration: Symmetric 40 mm / 40 mm
• Operation: Mechanical keyed cylinder
• Compatibility: Designed for standard euro-profile lock cases and door fittings
• Application: Indoor and outdoor door locking where euro-profile cylinders are used

How to use

To install, remove the existing cylinder following the lock manufacturer’s instructions, align the NUKI Cisa Astral S 40/40 cylinder with the door lock case and secure it with the central fixing screw. Insert the matching key to check smooth turning and proper engagement with the lock mechanism from both sides. Ensure the cylinder is seated flush with the door escutcheon and test locking/unlocking several times to confirm correct operation before regular use.

Usage recommendations

Verify that your door and lock case accept a euro-profile cylinder with symmetric 40/40 dimensions before purchase. Use the correct length to avoid protrusion or internal misalignment. Regularly lubricate the cylinder with a graphite or manufacturer-recommended lubricant and operate the key gently to maintain long-term mechanical reliability.