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CHU-3R35X-80-SC-L
Union 3R35X Escape Deadlocking Latch Satin L.Hand (Chubb At Heart)
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Union (Chubb At Heart) 3R35X Satin L.Hand Escape Dead Latch
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Delivery Information
| Delivery Time Frame | Delivery Information |
| Next Working Day By 1PM | When an order is placed by 3pm for next working day on certain items |
| Standard Delivery | Usually delivered in 2 to 4 working days |
| Delivery Charges | |
| UK Mainland | Prices start at £3.95 for very small items, £6.50 for small, £9.50 for medium and £20 for large/long items |
| Scottish Highlands & Islands, Northern Ireland & Ireland | Prices from £30, please see our delivery page for more info. |
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£387.25
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£322.71
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£268.70
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£223.92
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Description
Reliable Perimeter Protection and Rapid Emergency Egress
Balancing life safety with property security is one of the toughest challenges in commercial door hardware specification. Buildings require external perimeter doors and corridor dividers that resist determined forced entry, yet occupants inside must always be able to leave instantly during an emergency. When commercial properties fit standard deadlock hardware, occupants risk being trapped if keys are missing during an evacuation. Conversely, fitting ordinary latches leaves the premises vulnerable to physical manipulation, latch slipping, and unauthorised intrusion.
The Union 3R35X Escape Deadlocking Latch Satin L.Hand solves this challenge by blending industrial strength locking with instant exit capability. Engineered from the heritage Chubb at Heart detainer mechanism, this mortice unit automatically deadlocks every time the timber door clicks shut. While external visitors require one of the high security detainer keys to enter, staff on the inside can depress the lever handle ref 3R35F to override the deadbolt immediately. This single action withdraws both the latch and deadlocking elements in one fluid movement, ensuring safe departure without ever fumbling for keys.
Designed specifically for left hung timber doors up to 50mm thick, this unit delivers peace of mind across offices, educational facilities, storage hubs, and public sector properties. It protects your building assets through robust physical barriers while honouring strict fire escape protocols under standard UK regulatory standards. With heavy duty internal components and an EN 1634-1 fire assessment, it represents a dependable investment in long term building safety.
How the Union 3R35X Delivers Dependable Everyday Operation
Immediate Slam Action Deadlocking
As soon as the door closes into the frame, the automatic deadlocking action engages. This eliminates reliance on key holders remembering to throw a deadbolt at the end of the day. The 10mm throw sintered iron latch bolt deadlocks instantly against credit card slipping and physical tampering.
Always Free Escape Mechanism
Safety remains paramount during fire alerts or building evacuations. The inside follower operates independently, meaning the internal handle cannot be locked. A single downward stroke on the interior lever instantly clears the latch bolt, allowing rapid egress without technical hurdles or delay.
Advanced Chubb Detainer Security
Unlike common lever mechanisms, detainer style locks generate a significantly higher number of unique key differs. This complex internal array provides superior resistance against picking attempts and unauthorized key duplication, offering exceptional security for sensitive areas and storage units.
Daytime Snib Passage Control
When high traffic demands free two way flow, the integrated hold back snib holds the latch securely inside the mortice case. This stops the door from self latching during deliveries or peak business hours, preventing accidental lockouts and prolonging hardware life.
Detailed Specifications
| Specification | Rating or Standard | Practical Details |
|---|---|---|
| Product Model | Union 3R35X | Manufactured with genuine Chubb at Heart detainer engineering heritage. |
| Fire Resistance | EN 1634-1 Assessed | Assessed for use on 60 minute timber fire doors when installed with approved intumescent materials. |
| Door Handing | Left Hand Specific | Dedicated handing for doors with hinges visible on the left side when closed. |
| Case Dimensions | 80mm Depth (3 Inch) | Case height of 148mm with a compact steel body finished in silver powder coat. |
| Backset and Centres | 50mm Backset / 56mm Centres | Compatible with handle ref 3R35F for escape actuation. |
| Faceplate and Striking Plate | 200mm x 25mm Square Forend | Plated in modern satin chrome with a matching durable box striking plate. |
| Internal Components | Sintered Iron Construction | Hard wearing sintered iron latch bolt and follower for extended commercial lifespan. |
| Latch Bolt Throw | 10mm Automatic Projection | Provides automatic positive engagement into the frame keep upon door closing. |
| Attack Resistance | Physical Security Upgrades | Engineered with force resistant, anti pick, and anti saw internal protections. |
| Door Thickness Suitability | Timber Doors Up to 50mm | Supplied with 2 brass detainer keys sized for leaf depths up to 50mm. |
| Manufacturer Warranty | 10 Year Guarantee | Backed by long standing manufacturer support covering defects in materials and craft. |
Accurate Handing Identification for Your Project
Because the Union 3R35X escape deadlocking latch has dedicated handing, confirming your door swing before purchase is essential for proper function and latch orientation. Handing cannot be reversed on site without compromising internal factory alignments.
To determine your door handing accurately, stand on the side of the door where the hinge knuckles are visible when the door is closed. If the hinges are mounted on your left hand side, your door requires this left hand lock. If the hinges are mounted on your right hand side, you will require the corresponding right hand model.
Essential Installation and Maintenance Recommendations
To preserve the EN 1634-1 fire performance rating on certified 60 minute fire doors, install the lockset alongside approved intumescent lock jackets. Mortice cutouts reduce the timber core density, and intumescent protection expands during heat exposure to maintain structural integrity.
Keep the lock operating smoothly by checking latch projection and keep alignment twice yearly. Avoid packing heavy greases into the detainer chamber. Light graphite lubrication or specialised lock sprays will keep the internal detainer packs moving freely without attracting sawdust or dust build up.
Need Technical Advice on Door Hardware?
If you are unsure whether this mortice lock meets your specific building regulations, door handing, or fire door certifications, our technical hardware specialists are on hand to assist.
Contact Our TeamSpecification
| Manufacturer | Union |
|---|---|
| Finish | Satin Chrome |
| Guarantee | 10 Year |
| Lock Type | Mortice Escape Lock |
| Lock Operation | Lever |
| Lock Backset | 50mm |
| Lock Centres | 56mm |
| Follower Size (mm) | 8 |
| Faceplate Width | 25mm |
| Environmental Suitability | Exterior |
| Door Material Suitability | Wood |
| Max Door Thickness (mm) | 50 |
| Forend Finish | Chrome |
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