Bathroom Door Lock (Thumbturn) – Satin Nickel (78mm Case / 57mm Backset)Bathroom Door Lock (Thumbturn)

A medium duty bathroom mortice lock designed for internal timber doors in domestic and commercial buildings. The latch is operated by a standard door handle, while the deadbolt is locked and unlocked using a bathroom turn with a 5mm spindle, providing reliable privacy for WC and bathroom doors. The longer 78mm case with 57mm backset is ideal where a deeper lock position or extra handle clearance is required, and the satin nickel finish offers a clean, contemporary look to match modern door furniture.

Key Features

• Medium duty bathroom lock for internal timber doors in homes, offices and commercial premises.
• Latch operated by lever handle; deadbolt operated by separate bathroom turn (5mm spindle).
• Medium duty spring – recommended for use with sprung door handles.
• Tested and CE marked to BS EN 12209 for reliable performance and durability.
• Certifire approved (CF5531) for use on 30 and 60 minute fire doors when fitted to a suitable door set.
• 13mm deadbolt throw for positive engagement into the frame, improving privacy and security.
• 78mm case depth with 57mm backset to follower – ideal for deeper lock mortices and wider stile sections.
• Reversible latch bolt for left- or right-handed doors.
• Satin nickel square faceplate and keep for a neat, modern edge detail.
• Corrosion rating Grade 1 – best suited to clean, dry, low-humidity internal environments.

Typical Applications

• Bathroom and WC doors in domestic properties.
• Staff and customer toilets in offices, shops and other commercial buildings.
• En-suite and shower room doors where simple privacy locking is required.
• Refurbishment or replacement of existing 78mm case bathroom locks.

Specifications