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Wooden Staircase

KNAPP® connectors can be used on all wood materials and provide a high degree of pre-manufacturing. With our concealed connectors, there are no unpleasant looking cover caps and visible threaded rods. The easy-con® connector is a perfect fastener for an easy and fast joining of the stair tread to the stringer. The DUO-System is perfect to connect the stringer between posts. The assembly is very simple and can be carried out by a single person using standard tools and machines.

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DUO 30

DUO 30 / DUO 35

The DUO 30 and DUO 35 connectors are innovative and versatile products that are often used in furniture making and architectural millwork. Common applications include sectional sofas and couches, facades, windows, staircases, handrails, shop fitting, beds, tables, wooden staircases, indoor and outdoor wall paneling, and much more. They are easy to use by simply being snapped into place and provide a recessed and concealed connection, saving time for further processing of the workpiece, allowing a simple and fast assembly, and easy shipping.
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Uno 30

UNO 30

The UNO 30 features an easy and fast assembly that simply snaps into place. The UNO 30 is designed for common uses like facades, wall paneling, baseboards, moldings, handrails, furniture, and fixtures but truly has endless applications. This product can be used on all wooden materials but also in combination with concrete, stone, aluminum, steel, plastic and other materials while providing a concealed and self-locking connection. The UNO 30 is a hook connector made of stainless steel that saves time by being immediately load-bearing and retains the design aesthetic of your finished product with no visible holes, screws, or drilling.
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The easy-con® is a versatile and non-visible fastener, used in multiple furniture and interior design applications such as staircases, desks, beds, tables, and more. Beautiful interior design elements and furniture pieces will retain value and aesthetics with no exposed connector parts. This easy-con® is made of a high quality steel and allows for the end product to be easily assembled by a single worker, using standard tools and machines.
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DUO System


The DUO-System is strategically engineered for fast processing, while maintaining a design of traditional frame joints in furniture making. The DUO-System is simple and easy-to-use, even for the end user. It is self-thigething, adjustable, and provides a hidden connection. It is perfect for bed frames, small timber construction, exterior and interior cladding, wooden staircases, and furniture.
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The ZIPBOLT™ connector is a practical and innovative solution as a frame and worktop connector. The ZIPBOLT™ completely eliminates the difficult and time-consuming use of a screwdriver needed for conventional connectors. The connector consists of a threaded rod, which has a metric fine thread, and ensures an optimal force transmission combined with a force-transmitting gear drive. The mounting of the connector is very fast and is easy to install with a cordless screwdriver. With these tools, the processor can quickly tighten the components together. One-hand mounting is also possible. The worktops and frames can be connected in just a few seconds. The different variations of the ZIPBOLT™ are specifically tailored for different dimensions and requirements in the components.
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