Tongue and groove connection

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Tongue and groove connection
Connection of two boards with groove and bung, above: paneling , below: floor

The tongue and groove connection and the bunging are wood connections , mainly board-like components are plugged together at their edges.

  • In the tongue and groove have both components to be connected at the edges each have a groove , in the third as a connecting component is a so-called spring is inserted. The connection is positive and perpendicular to the board level.
  • In the case of bunging , a tongue is worked onto the edge of one of the two components to be connected, which is inserted into a corresponding groove in the adjacent component.

Tongue and groove connections are not always exactly differentiated from mortise and tenon connections . In particular, pin connections can also be viewed as tongue and groove connections if the pin is not incorporated, but is inserted in the manner of a tongue .


Springs and bungs are too thin to create a rigid connection. They should therefore only be subjected to shear stress, for example to transfer normal forces from board to board. The load on a floor board would be distributed to the surrounding boards.


Both types of connection are classic wooden connections for doors, walls, floors and ceilings made of wooden boards. Today plastic boards are also used (for example for laminate floors ), the bunging predominates.

This type of form fit is also used when creating walls and larger panels from the same components that are not made of wood. Insulation boards are not only held against each other by means of a tongue and groove connection, a more windproof connection point is also created than with single-edged boards. Concrete bricks and prefabricated reinforced concrete parts are also put together with a form fit so that mortar can be partially or completely dispensed with.

The shaft-hub connection by means of a feather key used in mechanical engineering has emerged from the tongue-and-groove connection.

Individual evidence

  1. ^ Tongue and groove connections. Retrieved August 1, 2012.
  2. tongue and groove connection. Retrieved August 1, 2012