Mortise lock LOB 257L CP by LOB — model 0026305, polished chrome finish

Mortise lock LOB 257L CP by LOB (polished chrome finish) is a compact mechanical lock designed for in-frame installation in standard wooden or metal doors. The unit provides a built-in locking solution for interior and exterior doors where a mortise lock body is required. Its polished chrome surface offers a corrosion-resistant, smooth appearance suitable for residential and light commercial environments. The lock is compatible with standard mortise-cut door preparations and with matching handles and cylinders designed for LOB 257L series dimensions.

Advantages

The LOB 257L CP mortise lock is made for straightforward installation into prepared door edges and provides consistent mechanical operation for latch and deadbolt functions. The polished chrome finish improves resistance to surface wear and simplifies cleaning. The lock body and latch geometry are designed to align with common European door fittings, enabling compatibility with a wide range of lever handles and cylinder types. Constructed for repeated daily use, it delivers stable closing and secure engagement without electronic components.

Suitable for

• Residential entrance and interior doors
• Light commercial office doors and utility rooms
• Doors requiring a built-in mortise lock body with a polished chrome appearance

Key specifications

• Type: Mortise lock for in-frame installation
• Finish: Polished chrome
• Functions: Latch operation with deadbolt compatibility (mechanical)
• Compatibility: Designed for standard mortise-cut doors and common lever handle/cylinder fittings
• Application: Suitable for interior and exterior doors in residential and light commercial settings

How to use

Prepare the door edge according to standard mortise dimensions that match the LOB 257L series, ensuring correct backset and faceplate routing. Insert the lock body into the mortise pocket and secure the faceplate to the door edge with appropriate screws. Fit the spindle and lever handles, and install a compatible cylinder if deadbolt or key locking is required. Test latch retraction and deadbolt engagement for smooth operation and adjust strike plate alignment on the door frame as needed to ensure secure closing.

Usage recommendations

Use corrosion-resistant screws and check alignment after initial installation. Periodic lubrication of moving parts with a dry or light oil lubricant and inspection of screws and strike plate alignment will prolong reliable operation. For exterior applications, ensure the door and frame provide adequate weather protection to maintain the polished chrome finish.