Square tube insert 12×12 mm, anthracite
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Square tube insert 12×12 mm, made of polyethylene, anthracite (RAL 7016). Tube wall thickness 1.0–2.0 mm. External section height 4.0 mm, internal section height 11.6 mm. Flange and retaining fins. Weight 0.0008 kg.
Product code: 002-678
Product features
[PIM] zaslepki-kwadratowe #1026
- Profile [mm] 12×12
- Colour Anthracite grey
[PIM] zaslepki-do-rur-i-profili #1025
- Shape Square
- Profile [mm] 12×12
- Colour Anthracite grey
Description
Square tube insert 12×12 mm, anthracite

The Square tube insert 12×12 mm in anthracite (RAL 7016) is a finishing component that closes the open end of a section of tubing. It is made of polyethylene and sold individually, so you can order exactly as many as you need for a project.
Tube inserts protect tube ends from dirt and prevent debris from entering, while giving the structure a neat, closed finish. Anthracite (RAL 7016) is a dark shade of grey, popular for dark-coloured structures and frames.
Design and installation
- The external flange covers the edge of the tube and provides a finished end.
- The internal section with fins slides into the tube and holds the insert in place.
- The fins accommodate tube walls within the specified thickness range.
- Polyethylene is a lightweight material commonly used for tube inserts and is resistant to everyday soiling.

For installation companies and contractors
The insert is useful for finishing lightweight structures made from hollow sections, such as frames, supports and railings, where a neat appearance and protection of open tube ends are important. When selecting an insert, check the nominal tube size and wall thickness. Detailed insert dimensions are provided in the specification tables below.
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