Square tube insert 20×20 mm, black
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Black 20×20 mm Square tube insert made of polyethylene. Tube wall thickness: 1.0–2.5 mm. External section height: 4.2 mm; internal section height: 12.8 mm. Flat flange, 3 retaining ribs. Weight: 0.0023 kg. For steel and aluminium tubes.
Product code: 002-668
Product features
[PIM] zaslepki-kwadratowe #1026
- Profile [mm] 20×20
- Colour Black
[PIM] zaslepki-do-rur-i-profili #1025
- Shape Square
- Profile [mm] 20×20
- Colour Black
Description
Square tube insert 20×20 mm, black

The black Square tube insert 20×20 mm is a practical finishing component for closing the open ends of steel and aluminium tubes. It is suitable for structures, frames and bases where tube ends need to be closed and neatly finished.
The insert is made of polyethylene, a material commonly used for finishing components. The ribbed inner section slides into the tube opening, while the flat outer flange covers its edge to provide an even, neat finish.
Applications and selection
- Closing the ends of 20×20 mm square tubes in structures and frames
- Finishing frames, bases and fittings made from profile tubing
- Closing exposed tube openings in visible areas
- The dark colour complements dark-coloured tubes

Selecting the right insert
The most important factors when selecting an insert are the nominal tube size and wall thickness. Ribbed inserts are designed to fit tubes with wall thicknesses within a specified range, so it is advisable to measure the tube and compare the result with the specification before ordering.
The insert is small and lightweight, making it easy to order the quantity needed for a particular project, whether for individual structures or larger production runs. To install it, press the ribbed section into the tube opening until the flange rests against the edge.
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