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CHU3K74067SC
Union 3K74E 5 Lever Sashlock 67mm Satin BS3621 (Chubb At Heart)
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Union (Chubb At Heart) B-3K74E 67mm Satin 5 Lever Bs Mortice Lock 2K
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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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£95.88
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£79.90
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Description
Union 3K74E 5 Lever Sashlock 67mm Satin BS3621 (Chubb At Heart)
When it comes to securing your home or commercial premises, the choice of locking mechanism is the most critical decision you will make. The Union 3K74E 5 Lever Sashlock 67mm Satin BS3621 represents the pinnacle of traditional British security engineering. Often referred to by industry professionals as having a Chubb at heart, this lock combines decades of heritage with modern manufacturing standards to provide an impenetrable barrier against unauthorised access.
This high performance mortice lock is specifically designed for timber doors that are hinged on either the left or the right side. It offers a versatile solution for property owners who demand the highest levels of protection. By choosing this hardware, you are investing in a product that has been rigorously tested to meet the demanding BS3621 standards, ensuring that it qualifies for the stringent requirements set by most insurance companies and the Police through the Secured by Design initiative.
Unrivalled Security Features
Security is not just about the thickness of the metal but the integrity of the internal mechanics. This model is engineered to counter the most common methods of forced entry employed by intruders today. The internal lever pack is precision-engineered to withstand manipulation, making it an incredibly difficult target for those attempting to pick the lock mechanism. Furthermore, the hardened steel rollers within the deadbolt provide a crucial defence against sawing attempts.
- The internal components are fortified with anti-drill technology to prevent intruders from compromising the cylinder area with power tools.
- The anti-pick levers ensure that the internal mechanism remains resistant to sophisticated lock manipulation techniques.
- The hardened steel rollers embedded within the deadbolt are specifically designed to spin upon contact with a saw blade, effectively preventing the bolt from being cut through.
- An extended 20mm deadbolt provides a deep reach into the door frame, ensuring positive deadlocking that resists physical force and frame spreading.
- The case is constructed from high-grade steel with a durable silver powder coat finish that protects the internal mechanism from environmental degradation over time.
Mechanical Physics and Structural Integrity
The operational success of this sashlock relies on the precise balance of mechanical forces. When the key is turned, the internal levers must align perfectly to release the bolt. This movement is smooth and deliberate, reducing the internal friction that often leads to component fatigue in lesser quality locks. The use of sintered iron for the follower ensures that the torque applied by the handle does not cause premature wear or deformation. This structural robustness is vital because a lock that experiences internal flex is a lock that will eventually fail under stress. By maintaining rigid tolerances, this unit ensures that the deadbolt remains firmly in place even if the door frame itself is subjected to physical impact or external pressure.
Operational Workflow and User Interaction
Interacting with this hardware is a seamless experience designed for daily reliability. To lock the door from the outside, the user simply inserts the key and performs two full turns, which throws the deadbolt into the keep. The internal mechanism provides tactile feedback, letting the user know that the bolt has fully engaged with the striking plate. To withdraw the latch, the user operates the lever handle, which retracts the roller bolt without the need for a key. This dual functionality is what makes the sashlock so practical for high-traffic environments. Because the roller bolt is non-handed, it offers a smooth action that eliminates the jarring resistance often felt in cheaper door furniture, preserving the finish of your door frame and the longevity of the handle mechanism.
Ergonomics and Safety Compliance
In a professional environment, the safety of occupants is paramount. This lock is compliant with modern safety standards, meaning it does not pose a hazard during emergency egress if installed correctly with appropriate handle sets. The ergonomic design of the keys allows for easy operation, even for individuals who may have limited dexterity. By reducing the force required to turn the key, this hardware minimizes the physical strain placed on the wrist and hand, ensuring that security measures never become a barrier to accessibility. Furthermore, the inclusion of matching escutcheons ensures that the hardware is aesthetically pleasing while also protecting the wood surface from scratches during the key insertion process.
The Commercial Value of Premium Hardware
Choosing high-quality door hardware is a strategic financial decision for any property manager or homeowner. While the initial investment in a Union 3K74E 5 Lever Sashlock may be higher than generic alternatives, the long-term value is undeniable. Cheaper locks often require replacement within a few years due to spring failure or metal fatigue. By contrast, this premium model is backed by a 25-year guarantee, reflecting the manufacturer's confidence in the longevity of the materials used. Investing in durable hardware prevents the recurring costs of locksmith callouts and emergency repairs, while also maintaining the integrity of your insurance coverage. When you protect your assets with police-approved hardware, you are effectively mitigating the risk of loss, which can lead to lower insurance premiums and greater peace of mind.
Technical Specifications
To ensure that this unit is the perfect fit for your specific door requirements, please review the detailed technical data provided in the table below.
| Feature | Specification |
|---|---|
| Lock Type | 5 Lever Mortice Sashlock |
| Backset | 40mm |
| Case Size | 67mm (2.5 inches) |
| Case Height | 108mm |
| Faceplate Dimensions | 153mm x 25mm |
| Centres | 57mm |
| Deadbolt Material | Brass with hardened steel rollers |
| Follower Material | Sintered Iron (8mm square) |
| Finish | Satin Chrome Plated |
| Standards | BS3621:2007, CE Marked, Secured by Design |
We understand that selecting the right security hardware for your specific door setup can sometimes feel overwhelming. If you are not sure if this mortice lock is right for your requirements, please contact our friendly team today. Our experts are always on hand to provide technical guidance and ensure you select the correct size and specification for your project.
Professional Recommendation: Always ensure that your door thickness is within the recommended range for this lock. Because this unit is designed for doors up to 50mm thick, it is essential to verify your measurements before installation to guarantee that the key and cylinder function without obstruction or binding.
With its blend of hardened security features, robust mechanical design, and long-term reliability, the Union 3K74E 5 Lever Sashlock 67mm Satin BS3621 remains the gold standard for residential and commercial security. Whether you are upgrading an existing door or securing a new installation, this hardware provides the peace of mind that comes with industry-leading protection.
Specification
| Manufacturer | Union |
|---|---|
| Dimensions | 108 (H) x 67 (D) |
| Guarantee | 25 Year |
| Lock Type | Mortice Sashlock |
| Lock Operation | Lever |
| Lock Backset | 40mm |
| Lock Centres | 57mm |
| Follower Size (mm) | 8 |
| Faceplate Width | 25mm |
| Environmental Suitability | All |
| Mechanism | Sashlock |
| Door Material Suitability | Wood |
| Max Door Thickness (mm) | 50 |
| Forend Finish | Chrome |
| Security Standards | BS3621:2007 |