Top 21

Original biscuit joiner with height-adjustable cutter
Holz verbinden


Top 21 is the top biscuit joiner with height-adjustable cutter based on the tried-and-tested original from the inventor of the system. With the fixed, self-clamping and detachable connecting fittings, Lamello's products represent the most complete and versatile wood joining system around. 

  • Unique rotating height adjustment to set the cutting position in 0.1 mm intervals, totalling in 4 mm
  • Powerful, electronically controlled 1'050 W motor with soft start, constant speed, restart and overload protection
  • Precision-machined guide and application surfaces for perfect fit of work pieces
  • Multifunctional stop square for vertical stability as well as perfect mitres due to the application on the outer surface for 22.5 and 45° angles

Benefits of the Lamello joining system

  • A single power tool for many connecting fittings offering fixed and detachable connections
  • No tool change required for the various connecting fittings
  • Lateral tolerance allows for faster working without positioning aids and stops
  • Avoid errors when adjusting the cutting depth since both work pieces have the same groove depth
  • Proven cutting principle with a disc cutter ensures that the grooves are always parallel and precise, even in the case of knots or rapid working

Buy product

Top 21 in a Systainer
  • Top 21
  • Carbide tipped cutter
  • Suction stub 23 mm
  • Suction stub 36 mm
  • Dust bag
  • Stop square
  • Spacer 4 mm
  • Tool set

Top 21 in a Systainer with cutter with reversible blades
  • Top 21
  • Cutter with reversible blades
  • Suction stub 23 mm
  • Suction stub 36 mm
  • Dust bag
  • Stop square
  • Spacer 4 mm
  • Tool set

Product information


A cutting principle for many different joining elements.

Swivelling front stop with fixed pivot point

Join reliably with the cutter which is in the exact center between to two application surfaces

Multifunctional stop square

In addition to vertical stability resulting from the larger contact area, the stop quare enables variable adjustment of the groove position, 0-50 mm.

Revolutionary height adjustment

Adjustable cutter position (+-2 mm) in 0.1 mm increments over the rotary knob, for individual positioning of the groove.

Always in the center

Always cut the groove into the center of the workpiece thickness - as a result of the adjustable cutter position

Powerful motor

Powerful motor with electronic controller, soft start, speed control, overload protection, and restart protection.

Technical information machines

Voltage (V):
230 V or 120 V
Power (W):
1'050 W
Speed (U/min):
9'000 minˉ¹
Cutting depth max:
20 mm
Weight (kg):
3, 5 kg

Corresponding system products

Stop square for Zeta, Top 21, Classic X

Multi-functional stop square for more stability and for variable adjustment of the groove position

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Spacer 2mm for Zeta, Top 21, Classic X

Cut in the center of the board in 16mm panels

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Original wooden biscuit

The original biscuit that always fits!

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Clamex S

Detachable, flexible and easy

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The self-clamping biscuit

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The clamping element

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C20 / C10

Solid surface element

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Detachable slide-in connector

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Spannsystem für Korpusse

Clamping Set

Clamping system for carcasses

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das universelle Leimgerät


The universal glue applicator

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Spacer 4mm for Zeta, Top 21, Classic X

Spacer to adjust the position of the groove

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