DUO 30 / DUO 35 – Sample Pack

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DUO 30 / DUO 35 – Sample Pack


The DUO 30 / DUO 35 Sample Pack contains 8 pairs:

2 x DUO 30 oL
2 x DUO 30 mL
2 x DUO 35 oL
2 x DUO 35 mL

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DUO 30/35 Sample Pack

The DUO 30 and DUO 35 hook connectors come in 30 and 35 mm and consist of two identical round shaped steel brackets that hook into each other in a dovetail-like manner. They form a stable load-bearing connection immediately after screwing and hooking together the parts. They can be simply installed using the KNAPP® Forstner Bit with our custom adjustable depth gauge.

Because of the bracket’s round shape, it can be easily fitted into a ∅ 30 mm x 3 mm recess. Utilizing the DUO Center Punch you can mark the wall and/or counterpart at the exact spot where the connection is to be made.

DUO 30 = 30 mm in diamter. DUO 35 = 35 mm in diamter.

DUO mL = with sideways tolerance of 1/8+ (1,7 mm). DUO oL = without sideways tolerance

Features and Benefits:
  • Fast assembly
    • Components are simply hooked together in seconds
    • Reduces labor and equipment cost
  • Non-visible connector
    • Appeals to the architect and customer
  • Self-tightening
    • Can be disassembled if needed
    • The DUO 30 mm can be used with a Locking Clip making the connection permanent
  • Versatile
    • Low recess depth of 3 mm
    • Two sizes ø = 30 mm and 35 mm
    • Two versions mL and oL (with and without sideways space)
    • Can be used with standard screws
    • Hooking way 15mm
    • Attach components flush, 3 mm, or 6 mm away
  • Perfect for industrial manufacturing with CNC
  • Used with all wood and board materials
  • For the DUO 35, Euro-screws are recommended
  • Wall Panels
  • Stair Treads
  • Windows and doors
  • Architectural Millwork
  • Shopfitting
  • Furniture Material



Steel – Zinc plated


DUO mL – Blue galvanized,
DUO oL – Yellow galvanized

Connector type

Hook-in connector


Screw-in with CS-screws (DUO 30) Euro-Screw 6×10 mm (DUO 35)


Concealed, self-tightening, demountable connector


Using our KNAPP Forstner Bit with adjustable depth stop, drill a ø = 30 or 35 mm hole, 3 mm deep. Install with CS screws.

Suitable materials

All woods and board materials


Wall panels, cabinet end panels, ceiling panels, handrails.


Doors and Windows