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PAR-JHD72DNL-SQ-SS60
Union HD72DNL-S DDA 60mm Backset Euro Deadlocking Nightlatch Satin
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Union HD72DNL-S DDA 60mm Backset Euro Deadlocking Nightlatch Satin with Square Forend BS EN 12209
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£18.32
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Description
Mortice Locks
Union HD72DNL-S Euro Deadlocking Nightlatch
Managing high-traffic commercial environments requires hardware that functions reliably every single day while facing the relentless pressure of constant public usage. The Union HD72DNL-S serves as a primary security solution for doors located in schools, hospitals, or large offices where occupants often lack the incentive to treat fixtures with particular care or precision during their daily routines.
This Euro profile deadlocking nightlatch features a durable construction that survives extreme cycle testing to ensure your building remains secure long after other components might fail. The satin stainless steel forend provides a crisp, modern aesthetic that fits perfectly into professional interiors, while the hardened internals handle the mechanical stress of heavy usage without losing their smooth action or responsive latching feel over many years.
60mm
BACKSET SIZE
72mm
CENTRE DISTANCE
3.5M
CYCLE TESTED
BS EN 12209
QUALITY STANDARD
Why Choose the Union HD72DNL-S DDA 60mm Backset Euro Deadlocking Nightlatch Satin
This lock provides a stable and long-term security solution for doors that endure significant daily physical wear and tear.
Exceptional Mechanical Durability
Engineered to exceed three and a half million cycles, this unit performs at a level fourteen times higher than standard industry requirements demand. Such extreme testing creates peace of mind for facility managers because it significantly reduces the likelihood of emergency hardware replacements or unexpected site visits required just to fix a jammed latch.
Consistent Architectural Standards
The entire HD72 range shares an identical physical footprint, which means you can swap components across different door types without needing to drill new holes or modify the timber. This shared design language simplifies your hardware inventory and makes the lives of maintenance teams much easier during busy periods of facility refurbishment.
Enhanced User Accessibility
This unit helps you satisfy the recommendations found in BS8300 and Approved Document M for inclusive design in public buildings. By ensuring smooth operation for individuals with varying levels of physical strength or dexterity, you can confidently meet your regulatory duties while maintaining high standards of security across every single access point.
Engineering Quality and Daily Performance
The internal components rely on high-grade materials to distribute force evenly every time the latch is engaged or released by the key.
Precision Internal Mechanics
Internal springs and followers are manufactured to resist the fatigue that typically plagues lower-quality hardware after frequent operation. Because the latch bolt is designed to withstand aggressive impacts from high-frequency door closers, the mechanism retains its snappy return action even when exposed to daily slamming or high-volume usage patterns that would cause lesser products to break down.
The spindle grip feature works to eliminate annoying rattling sounds by keeping the door hardware tight against the face of the door leaf. This small adjustment provides a premium feel to the door assembly, giving users the impression of solid construction each time they grasp the lever to enter or leave a room.
Surface Finish and Protection
Grade 304 satin stainless steel provides the external faceplate and strike plate with excellent resistance against corrosion, moisture, and general oxidation found in busy buildings. This finish maintains a clean, professional appearance without requiring constant polishing because the material naturally resists finger marks and everyday scuffs, so it stays looking sharp for years.
A splinter guard is included with the set to provide a clean installation that hides the rough edges of the mortice cutout. This detail protects the timber around the lockcase and ensures the fit is neat, which is important for fire safety requirements as it maintains the integrity of the door assembly during a fire event.
Installation and Operational Workflow
Follow these standard procedures to ensure the lock performs correctly and remains within its warranty guidelines after installation.
1
Preparation and Handing
Identify the direction of your door swing and adjust the quick-reversible latch bolt to match the specific handing of the frame. This step takes only moments because the internal spring mechanism is designed for simple, tool-free adjustment, so you can switch the orientation from left to right without needing to disassemble the entire lockcase structure.
2
Mortice Alignment
Cut the mortice to the specified 90mm depth and ensure the 60mm backset aligns perfectly with your Euro profile cylinder position. Use the included template to mark your bolt-through screw holes with 38mm centres, as accurate alignment here ensures the lever furniture fits without putting undue pressure on the internal springs or the cylinder itself.
3
Strike Plate Fitting
Install the adjustable strike plate to ensure the latch bolt engages firmly without rattling against the door frame. Fine-tune the position until the door sits flush in the closed state, which allows the deadlocking feature to engage reliably once the snib comes into contact with the strike as the door is pulled shut.
Expert Installation and Care Tip
Check the door gap around the lock to ensure it sits between 2mm and 4mm, as this prevents excessive play which can lead to latch wear over time. Use a light silicone spray once a year on the latch tongue to keep the action smooth, but avoid thick oils that might attract dust or debris inside the case.
Technical Specifications
| Feature | Rating / Standard | Practical Details |
|---|---|---|
| Backset | 60mm | Provides standard clearance for common lever handles on wooden doors. |
| Centres | 72mm | Industry standard spacing for Euro profile cylinder and lever handles. |
| Fire Testing | EN 1634-1 | Suitable for use on 30 and 60-minute timber fire doors. |
| Cycle Testing | 3.5 Million | Extreme longevity testing for high-traffic public building applications. |
Longevity and Trade Reliability
This lock represents an excellent investment for commercial projects where long-term maintenance costs are a primary concern for the building owner. By choosing a product with such a proven cycle count, you ensure that hardware remains operational through millions of door openings, keeping facilities secure and reducing the total cost of ownership significantly.
Compatibility and Fitting Notes
This lock uses a deadlocking nightlatch function where the door automatically deadlocks upon closing, which means occupants should always carry a key for re-entry.
Ensure that the external pull handle is installed correctly if no lever handle is used on the outside, as this prevents unauthorised access while allowing proper use of the key.
The unit is Certifire approved for specific timber door sets, so always check your local fire door certification requirements before fitting to ensure full compliance with building regulations.
Specification
| Manufacturer | Union |
|---|---|
| Guarantee | 15 Year |
| Lock Type | Mortice Nightlatch |
| Lock Operation | Euro Cylinder |
| Lock Backset | 60mm |
| Faceplate Width | 24mm |
| Forend Finish | Stainless Steel |