ZOO ZDL7255NL / ZDL7260NL – DIN Night Latch (72 mm c/c, 55 & 60 mm Backset)
The ZOO ZDL7255NL / ZDL7260NL DIN night latch is a high-quality mortice-type latch designed for secure latch-bolt operation on a wide variety of internal and external doors. Engineered for durability, performance, and compliance with modern safety standards, it provides reliable latch functionality with enhanced security features in both commercial and residential settings.
Product Overview
The ZDL7255NL/60NL series is built around a 72 mm centre distance (spindle to follower) to suit standard DIN-format door furniture, offering two backset options — 55 mm and 60 mm — to match common door preparations. The night latch is supplied in satin stainless steel finish and is available with either a square or radius profile forend and strike plate to complement a range of architectural hardware styles.
Key Features
-
DIN standard 72 mm centres: Designed for compatibility with DIN-format handles and lever sets.
-
Backset options: Available in 55 mm (ZDL7255NL) or 60 mm (ZDL7260NL) backset to suit different door depths and frame conditions.
-
Materials:
-
SS304 one-piece stainless steel forend and strike for durability and corrosion resistance.
-
SS304 latch bolt with integrated anti-thrust pin for enhanced security.
-
-
Grip-tight follower: Ensures positive engagement with the operating spindle and reduces lever play over time.
-
Forend profiles: Choose between square or radius (rounded edge) profile to match door hardware aesthetics.
-
Fire testing: Successfully fire tested in accordance with BS EN 1634-1, making it suitable for use on timber fire doors up to 120 min and steel fire doors up to 240 min when installed with appropriate fire seals.
-
Performance standard: Mechanically tested to BS EN 12209:2003 Grade 3, demonstrating reliable operation and durability.
-
Certification: UKCA marked (Certificate AG7883), CE marked (Certificate AG5154), and Certifire approved (CF850) for assured safety and performance.
Dimensions & Physical Details
-
Case size (55 mm backset): Approximately 85 mm (W) × 165 mm (H).
-
Case size (60 mm backset): Approximately 90 mm (W) × 165 mm (H).
-
Faceplate / Forend: 235 mm (L) × 22 mm (W) × 3 mm (thick) stainless steel.
-
Latch Centres: 72 mm between spindle and follower — suitable for DIN handles.
Function & Operation
The night latch operates via a sprung latch bolt that can be operated from the internal side by a handle or lever and from the external side by a key or cylinder (depending on configuration). An anti-thrust pin enhances resistance to forced entry. Ideal for use on front doors, side doors, and other doors where latch-bolt security is sufficient without full deadlocking.
Suitability & Typical Use
The ZDL7255NL/60NL night latch is suited to:
-
Residential and apartment entrance doors
-
Office and commercial internal/external doors
-
School, healthcare, and public building access doors
-
Retrofit projects replacing existing DIN night latches
Its fire-tested status also allows integration into certified fire door assemblies (with appropriate intumescent protection), providing peace of mind in life-safety applications.
