When No Door Slams Shut. In Pursuit of Perfect Close Control, the Easy Way
At Sugatsune, we never close the door on innovation. Take our HES concealed hinge range, for example. We could have sat on our laurels when we completely reinvented the concept of a concealed hinge 30 years ago, coming up with a groundbreaking design that allowed hidden hinges to be used on interior doors as well as cabinets.
But we didn’ t. And over the past three decades, we have developed the HES into the most comprehensive concealed hinge range on the market, offering a complete solution for dozens of door types and sizes. And still we push forward. In recent years, we have introduced the award-winning HES1 for ultra-thin door frames, with a door gap so small it’ s perfect for‘ hidden doors’. Plus the partially surface-mounted HES2 for simpler installation.
There will be more additions to the HES range announced in 2026. But hinges are not all that matters to us when it comes to door hardware. We are equally always looking to innovate with door motion control, with products that pair perfectly with the HES range.
Products like the LDD-K, our latest innovative soft close damper system.
A Familiar Challenge, Revisited
Soft close technology is a speciality of ours. We’ ve been manufacturing door dampers for decades. And we’ ve drawn on that expertise again with the latest LDD-K model by putting our award-winning damper technology at the heart of it.
Like all of our soft-close products, the LDD-K allows for fine tuning of the closing motion control. This is thanks to the adjustable torque in the rotary mechanism. It matters because there’ s no such thing as a standard interior door. Weight, size and hinge friction all affect how a door closes. Soft close adjustment allows you to achieve a smooth, consistent motion that’ s just right for every installation- no slamming, no bounce-back, no strain on the hardware. Instead of a onespeed solution, you get control.
But if this applies across our entire damper range, what does the LDD-K add? In a word, convenience. Many softclose solutions require precise mortising, handed components, and with them, plenty of planning in installation. The LDD-K is different. It’ s surface-mounted on frame and door. It’ s non-handed, so works whichever way a door opens. And thanks to this flexibility, it’ s easy to retrofit to existing doors- ideal for renovation and upgrade projects, where altering the door or frame isn’ t always an option.
The LDD-K is as refreshingly straightforward in mechanics as it is in installation. The two go hand-in-hand. The main damper body is surface mounted on the frame side. A slim counterplate is mounted on the door. Three-way adjustment in mounting allows precise but simple alignment.
As the door swings shut, a built-in catch engages with the counterplate, activating the damping action late in the closing cycle. The catch system has benefits when it comes to opening the door. Because the distance of engagement between catch and counterplate is only short, doors fitted with the LDD-K experience less resistance on opening compared to those fitted with traditional door closers. Instead of a constant force, the latch releases early and opens easily. Control is applied where it is most needed, without impacting the entirety of the door’ s motion.
The LDD-K broadens the landscape in door damper options. It’ s designed to fit seamlessly into any environment. That’ s not just a matter of its easy installation. We never ignore aesthetics, and the LDD-K is available in four colour finishes- white, grey, brown, and black- to blend in seamlessly with different designs.
Working in Perfect Company
The slimline, sleek appearance of the LDD-K pairs naturally with HES hinges, helping designers add close control to the clean, concealed aesthetic. And the potential component couplings don’ t end there.
We also have products built for motion control at the other end of the door’ s open-close arc. The SAS-V is a completely concealed, adjustable door constrictor that prevents over-swing on opening. Like the LDD-K, it is non-handed, and it complements the HES when you want a flush, pristine finish. Some SAS-V models will also hold a door open at the desired angle until deactivated via a gentle push.
Adding another layer of control and protection, our DFHT door stoppers come in a range of styles- screw mount for the wall and a choice of screw or anchor mount for the floor. A choice of aluminium alloy and brass bodies combine durability with multiple coloured finishes, plus a natural rubber head to absorb impact and protect the door.
Simple, stylish, discreet and precise, Sugatsune components put you in control of door motion, from open to close.