4770MkII Nightlatch – Primary Lock – 89mm Backset Variants

4770MkII Nightlatch – Primary Lock

A heavy-duty cylinder mortice lock suitable for industrial, commercial, and institutional buildings, providing secure key-operated and turnknob functionality. Automatically latches when the door is closed and supports robust through-fixing of door furniture.

Features

• Cylinder mortice lock for heavy-duty applications

• Operated by key outside and turnknob or key inside

• Automatic latching when door closes

• Supports through-fixing of rose furniture, turnknobs, and escutcheons for durability

• Ideal for industrial, commercial, institutional, and high-traffic buildings

Variants

• Primary Lock – Standard 89mm Backset — 4770SS

• Primary Lock – Including Latching Adaptor — 4770TSS

• Primary Lock – Full Radius End Face Plate — 4770RSS