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Union HD72LA-S DDA 60mm Backset Mortice Latch Satin
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Union HD72LA-S DDA 60mm Backset Mortice Latch Satin with Square Forend BS EN 12209
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| Standard Delivery | Usually delivered in 2 to 4 working days |
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Description
Mortice Hardware
Union HD72LA-S DDA 60mm Backset Mortice Latch Satin
The Union HD72LA-S represents a significant advancement in door control technology, specifically engineered for commercial environments where traffic flow remains constant and the demand for reliability is absolute. By choosing this mortice latch, you are investing in a component that addresses the common failure points of standard hardware, especially in settings like schools, hospitals, or high-traffic office corridors where doors see heavy daily usage and occasional misuse.
This latch mechanism features a sophisticated internal geometry finished in a durable satin stainless steel, which maintains its professional appearance despite the rigours of intense daily contact. Because the case design is standardised across the range, it provides a consistent architectural footprint that simplifies site planning and hardware integration for contractors who require a predictable, high-performance solution that lasts for years without needing replacement.
60mm
BACKSET SIZE
3.5 Million
CYCLE TESTED
EN 12209
STANDARDS COMPLIANT
Grade 304
STAINLESS STEEL
Why Choose the Union HD72LA-S DDA 60mm Backset Mortice Latch Satin
This hardware solution combines extreme durability with simple installation processes for busy facility managers and professional installers.
Exceptional Durability
Engineers have tested this latch to over 3.5 million operations, which is significantly higher than the standard requirements set by current industry benchmarks. This means your doors continue to function smoothly even when they face high levels of repeated impact, saving your budget from the costs associated with early hardware failure and frequent repair visits.
User Inclusive Design
The product assists in meeting the requirements of the Equality Act because it works with lever handles to ensure that building access remains simple for everyone. By following the recommendations found in BS8300 and Approved Document M, you provide an environment that accommodates diverse user needs while maintaining necessary building security protocols.
Professional Installation
The inclusion of a splinter guard and an adjustable strike plate makes the fitting process cleaner and more accurate for carpenters. These thoughtful details reduce the time spent on manual adjustments, so that the door remains quiet and free from irritating rattles, which improves the overall quality of the interior space for the end users.
Engineering Quality and Daily Performance
A deep focus on internal mechanics ensures that this latch handles daily stresses while preserving the integrity of the door frame.
Internal Mechanism and Force Distribution
Inside the heavy-duty mild steel case, the internal spring technology works to distribute force evenly across the follower mechanism every time the lever is pressed. This specific engineering choice prevents the follower from wearing down, which often happens in cheaper alternatives where the constant pressure of a handle eventually causes the metal to lose its structural return capability.
The spindle grip feature also keeps the door furniture securely held, which prevents the handle from becoming loose or creating a rattling noise when the wind catches the door. By securing the handle assembly firmly to the latch body, the hardware feels solid to the touch and provides a tactile confirmation of quality that users notice immediately upon opening the door.
Weather Resistance and Long-Term Finish
The faceplate is crafted from grade 304 satin stainless steel, which provides a high degree of corrosion resistance for environments that might experience fluctuating humidity or temperature changes. This material choice remains attractive for years because it does not pit or rust, even when exposed to harsh cleaning chemicals often used in commercial janitorial routines to maintain hygiene.
Because the finish is consistent across the entire visible surface, the unit blends perfectly with other stainless steel architectural features found throughout modern buildings. The protective properties of the steel mean you spend less time worrying about oxidation, so the hardware keeps looking as good as the day it was installed long after other finishes might have tarnished or decayed.
Installation and Operational Workflow
Follow these steps to ensure the latch performs correctly within your specific door configuration.
1
Preparing the Site
Measure the door thickness carefully to confirm that the 60mm backset fits your specific frame profile perfectly. Use the provided template to mark the mortice position, noting that the case height measures 165mm, which requires a clean, square cut-out so that the latch sits flush and avoids binding during the final operation.
2
Handing and Insertion
Adjust the latch bolt for your door direction by using the quick reversible mechanism, which saves time by removing the need for internal disassembly. Insert the case into the door mortice, keeping the unit level and aligned with the strike plate, so the latch bolt hits the centre of the strike hole for smooth closing.
3
Fixing and Alignment
Secure the two-piece forend to the door edge, ensuring that the screw centres align with your furniture to prevent any warping of the faceplate. Test the spindle movement before closing the door completely, adjusting the strike plate if necessary to ensure the door latches with minimal force and zero annoying rattle against the frame.
Expert Installation and Care Tip
When fitting the latch, ensure the spindle hole remains perfectly aligned with the door furniture because even minor misalignment can increase friction and shorten the hardware life. Wipe the faceplate with a dry cloth periodically to remove dust, as this keeps the stainless steel looking pristine without the need for abrasive cleaning products.
Technical Specifications
| Feature | Rating / Standard | Practical Details |
|---|---|---|
| Backset | 60mm | Provides the standard distance between the door edge and the handle centre. |
| Follower | 8mm | Standard size compatible with most commercial lever handles. |
| Case Height | 165mm | Standard height profile suitable for most timber door mortices. |
| Cycle Testing | 3.5 Million Cycles | Indicates a design life far exceeding average commercial requirements. |
| Fire Rating | EN 1634-1 | Suitable for use on certified timber and metal fire door assemblies. |
| Faceplate | 235mm x 24mm | Durable grade 304 stainless steel for lasting appearance. |
Longevity and Trade Reliability
The combination of a high cycle count and fire testing makes this an ideal choice for contractors who need to guarantee their work for years to come. Investing in this hardware reduces the total cost of ownership, as the robust internal components prevent the recurring maintenance issues commonly found with lower-quality latch designs.
Compatibility and Fitting Notes
This latch features a 38mm centre spacing specifically designed to accept standard bolt-through door furniture, which keeps the handles securely attached to the door leaf.
You can install this unit on either left-handed or right-handed doors due to the clever reversible latch bolt design, which removes the need for stocking multiple versions.
This product is fully compatible with 30-minute and 60-minute timber fire doors, ensuring that you meet mandatory building safety regulations during your next installation project.
Specification
| Manufacturer | Union |
|---|---|
| Guarantee | 15 Year |
| Lock Type | Mortice Latch |
| Lock Backset | 60mm |
| Faceplate Width | 24mm |
| Forend Finish | Stainless Steel |