Connecting systems for modern Door and Window Manufacturing

The DUO 30, DUO 35 and UNO 30 systems offer innovative fasteners solutions for applications, such as facades and windows, interior and exte-rior claddings, and much more.

The universal KNAPP Dowel is a weather-resistant plastic dowel that especially suits door and window framing.

The KLICK System offers all the advantages to fasten components with small dimensions, such as moldings. The FIXclip Profile and FIXclip offer flawless fixing of glazing beads for windows.

KNAPP connectors allow a high degree of pre-fabrication. All connectors are recessed and are non-invisible, self-tightening, and can be disas-sembled and reassembled in most cases. Our fasteners meet the highest standards during the processing phase and assure an esthetically pleasing end design.

Are you from the Americas? Follow the link to view our Connecting Systems for Window and Door Manufacturing on our US website!
With over 30 years of experience inventing connecting solutions for woodworkers, KNAPP® is proud to say, „we supply the world“. While our main headquarters is located in Austria, KNAPP® has been supplying connectors to the United States and Canada for over 20 years. As the demand for invisible connecting solutions grew, we replied by establishing our U.S. branch in 2017 to better serve the needs of our fellow woodworkers. If you live within North, South, or Central America, please visit or email to be connected with the right representative.

FIXclip-Profile | The innovative glazing system

FIXclip-Profile GLE17

FIXclip-Profile GLE18

FIXclip-Profile GLE20, GLE20 Plus, GLE20 N

The FIXclip-Profile is the first and only fastening system to enable fastening and sealing in one operation. It saves assembly time and convinces with its special profile geometry.

The FIXclip- Profile is made of UV and weather-resistant plastic and is available in five versions GLE 17, GLE 18, GLE 20 or GLE 17, and GLE 20 Plus with a separate wedge seal.

  • Fastening and sealing in one operation.
  • Cost effective – reducing labor.
  • The perfect look – no visible fasteners
  • Simple snapping on of the glazing bead.
  • Safe – eliminates damage of glass pane that otherwise occurs due to misplacement of shooting nails.
  • Flexible – mounting can be done at manufacturing and/or on site.
  • Tested – meets all the requirements.
  • Fast mounting of the profile with screws or nails.
  • GLE20 Plus – with separate wedge seal for easy and fast mounting directly on the construction site
  • GLE20 Plus – easy to remove / disassembly possible if needed.
  • GLE20 Plus – suitable for both wedge sealing and wet sealing.
  • High quality material properties – elastic, can be nailed, UV and weather resistant, resistant to varnishes, glazes and cleaning detergents
  • For wood windows and wood-aluminum windows, as well as fixed glazing of windows and doors.

Burglary protection – RC1 and RC2 safety can be achieved by using screws to fix the dry glazing systems (must be verified by a separate test of the element).

FIXclip | The plastic glazing bead and profile connector

The FIXClip is a glass pane and glazing bead connector made of plastic that is completely concealed when installed. With the FIXclip, glass panes and moldings/trims are fixed in windows and doors without damaging the components like it would happen with conventional nailing or screwing. The FIXclip connector is used for wood windows and wood-aluminum windows, as well as fixed glazing. The connector is available in two sizes, H16 and H20 (H12 per request).

  • Perfect look – No visible fasteners.
  • Fast – Reduces labor and effective production process guaranteed.
  • Fastening – by nailing or screwing of the connector.
  • Non-visible – Concealed mounting of glass pane and glazing bead.
  • Can be disassembled without damaging the pane.
  • Tested – for wind load C5 (EN 12210) and shock resistance class 3 (EN 13049).
  • For glazing beads, moldings made of timber and/or plastic.

Burglary protection – RC1 and RC2 safety can be achieved by using screws to fix the dry glazing systems (must be verified by a separate test of the element).

KNAPP®-Dowel | The modern dowel made of plastic

The KNAPP®-Dowel made of weather-resistant polyacetal (POM) plastic is available in 6 mm and 8 mm diameters. The KNAPP®-Dowel consists of high-strength and weather-resistant plastic. The longitudinal grooves and the two holes ensure a firm anchoring in the material. In combination with the KNAPP®-Glue, it creates a strong and tight connection between the components when hardened.

  • Strong – joint can be loaded immediately after assembly, as the transverse grooves increase the strength.
  • Fast – absolutely no clamping/pressing times (important for automatic dowel manufacturing).
  • Self-tightening – the threads on the dowel ensure a strong hold until the glue is hardened.
  • Efficient – as opposed to conventional dowel and glue methods, the longitudinal grooves on the KNAPP-Dowel assure the optimum distribution of the glue in the borehole and prevent bulging of i.e. chipboards due to the swelling of the glue.
  • Robust – no opening of the joint due to shrinkage and swelling behavior, even when exposed to the environmental humidity changes.
  • Quality – guaranteed quality – no risk of breakage and cracking, as opposed to hardwood dowels (beech dowels, etc.)
  • Weather resistant – connection for inside and outside application.
  • Stable – highly loadable, especially in combination with KNAPP®-Glue PU+
  • Safe – the transverse grooves increase the holding force in the borehole – it provides space for the glue in between the dowel and the inner wall of the borehole – secure and immediate fixation and positioning of the components until the glue is hardened.
  • Clean – for automated dowel machines, we recommend simple white glue (for example PVAc) for easy and simple cleaning of the machines.
  • Automatic processing – KNAPP-Dowels work very well for automatic processing.

UNO 30 | Universal stainless steel hanging connector with locking clip

UNO 30 hook connector set

UNO 30 hook connector set, stainless steel

UNO 30 Box 100


UNO 30 Pack

UNO 30 hook connector, stainless steel

The UNO 30 connector set consists of a round stainless steel bracket with a V-shaped receiver socket and a SK-screw, including a washer. Easy and fast assembly is guaranteed, as the generously V-shaped receiver socket receives the SK-screw head when mounted. Optionally, a lock, made out of spring steel, can be added to latch the connector. Because of the bracket’s round shape, it can be easily fitted into a 30 mm / 7 mm borehole or a 30 mm / 7mm milled rebate. As the SK-screw is mounted to the component, the washer is there to perfectly set it to the right height to fit perfectly in the bracket, while still giving the ability to adjust in order to compensate any differences in dimensions. The UNO 30 is designed to hold screws with a 5-6 mm head and serves a vast amount of versatile applications.

  • Simple and fast – snap in place
  • Concealed – not visible
  • Self-tightening – through „dove tail“ principle
  • Safe – latch the connection
  • Flexible – used for versatile applications
  • Strong – holds up to 150kg/1.5 kN

The UNO 30 can be used for applications such as interior wall panels, baseboards, moldings, handrails and much more. There is truly no end to the versatile applications that the UNO 30 can be used for.

The UNO 30 is used in most cases for wood to wood components. However, it also can be used with normal dowels and that way opens up applications to fasten components to bricks, stones, concrete, dry walls, etc.

DUO 30, DUO 35 | The hook connector made of steel

The DUO 30 and DUO 35 set consist of two identical round shaped steel brackets that hook into each other in a dovetail-like manner. The connectors are load bearing, at the same time the brackets are screwed on the components mounted to each other. The DUO 35 fastener is screwed to the component with Euro-screws and ideal for the industrial use with a CNC-routing machine and especially suited to mount windows on site.

  • Simple – Easy to mount by just snapping components in place.
  • Non-visible – recessed and concealed fasteners.
  • Reduces labor cost
  • Low recess depth – only 3 mm
  • Two sizes ø = 30 and 35 mm
  • Two version mL / oL (with / without sideways tolerance)
  • Fast – can be used with standard screws
  • Hooking way 15 mm

KLICK-System | The modern plastic dovetail clip connectors

The KLICK and sKLICK connectors are connectors that serve to snap together and mount small components with small dimensions, such as moldings. The KLICKpro is an adapter for KLICK and sKLICK, and serves as a groove. The sKLICK and KLICKpro combined, find its use in applications of window linings for inside and outside. The miniKLICK is a 2-piece fastener for small trims. All KLICK-connectors are made of UV and weather resistant plastic.

  • Universal – for components with very small dimensions.
  • Non-visible – concealed fasteners for many applications, such as panels, co-vers, and trims.
  • Efficient – high degree of prefabrication.
  • Simple and fast – just snap components in place.
  • Cost effective – reduces labor, no screwing or nailing necessary, no need for covering nails and screws afterwards. Components can be painted before mounting.
  • Disassembly possible if needed.
  • Self-tightening, also used for clamping when components are glued together.
  • Can be used with standard screws.