Mortise lock LOB SIBA 10257 SN, stainless finish, mortise door lockset

LOB SIBA 10257 SN is a mortise lock designed for recessed installation in residential and light commercial doors. Finished in satin stainless (SN), the lockset provides both latch and deadbolt functions typical of mortise mechanisms and is intended for use with compatible handles and profile cylinders. The construction supports secure door closing and conventional key or handle operation while maintaining a flush appearance when fitted into the door edge.

Advantages

The mortise design integrates latch and deadbolt within a single body for compact installation and reliable operation. A satin stainless finish offers corrosion resistance and a neutral appearance that suits a range of interior and exterior door styles. The lockset is compatible with standard handle sets and profile cylinders, simplifying replacement or upgrade of existing mortise hardware. Robust internal components provide smooth action for the latch and deadbolt, supporting frequent use in homes and small businesses.

Suitable for

• Residential interior and exterior doors requiring a recessed lock
• Light commercial doors such as offices, small shops, and service rooms
• Replacement of existing mortise locksets where satin stainless finish is preferred

Key specifications

• Lock type: mortise lockset with latch and deadbolt functions
• Finish: satin stainless (SN)
• Installation: recessed into door edge (mortise)
• Operation: compatible with standard handles and profile cylinders
• Application: suitable for residential and light commercial doors

How to use

Prepare the door by cutting a mortise pocket in the edge that matches the lock body dimensions and marking positions for handle spindle and cylinder bore according to the handle and cylinder being used. Insert the lock body into the mortise, align the faceplate with the door edge, and secure it with screws. Fit the handle set and profile cylinder, then test latch and deadbolt operation to ensure smooth movement and correct strike alignment. Adjust the strike plate on the door frame as needed for secure engagement of the latch and bolt.

Usage recommendations

For reliable performance, use a profile cylinder and handle set compatible with the mortise lock dimensions, ensure correct alignment of strike plate and door frame, and perform periodic lubrication of moving parts. Verify that the door thickness and cutouts match the lock’s installation requirements before fitting.