Tubefittings are made of cast iron. They come in galvanized, raw and powder-coated versions.

All tubefittings are marked with a size that corresponds to the dedicated tube diameter. For example, in the case of D - 42 mm tubefittings, the diameter of the tube dedicated is 42 mm. It is worth noting that each tubefitting features a certain clearance, as the tube is assembled inside the tubefitting with the use of a dedicated set screw. Therefore, a slightly smaller or larger tube should be about fine.

Yes, a small additional clearance (1-2 mm) can be compensated by a set screw being screwed into the tubefitting. Such clearance does not affect the stability of the final structure.

For external use, we recommend the use of galvanized (silver) fittings. Tubefittings in black paintwork are powder coated, but they are not covered with a zinc layer, so we cannot give a 100% guarantee for long-term weather resistance. Natural tubeclamps, on the other hand, do not have any coating, they are raw. Natural tubeclamps are easy to paint or they can be used in highly designer projects in which the customers want to achieve the effect of rust and corten steel.

We do not provide this service ourselves, but you can paint the fittings yourself (preferably powder coating). For better corrosion resistance, we recommend powder coating of galvanized fittings.

Galvanized fittings are hot-dip galvanized, which ensures appropriate thickness and durability of the coating

Yes, all tubefittings are supplied with set screws as standard. If necessary, they can also be ordered separately.

Each set screw in a tubefitting can bear a shear load of about 600 kg per piece at a tightening torque of 40 Nm.

We will be happy to answer all your questions and help you make a decision, but we take no responsibility for the safety of the structure.

Tubefittings are supplied as standard with set screws, which can be tightened firmly with the use of an appropriate hex key.

Tubefittings are clamped on the tube with the use of a set screw screwed-into.

The following hex keys fit the given sizes of the tubefittings:

• Size A = (21.3 mm diameter fitting)
• Size BC = (fittings with a diameter from 26.9 mm to 33.7 mm)
• DEF size = (fittings with a diameter from 42.4 mm to 60.3 mm)

• - 21.3 - G 1/8" x 10 mm BSP
• - 26.9 and 33.7 - G 1/4" x 12.5 mm BSP
• - 42.4/48.3 and 60.3 - G 3/8" x 12.7 mm 19 BSP

This is due to the fact that the tubes may have a minimum tolerance of inner and outer diameter. This also applies to tubefittings. Since the tubefittings are made of cast iron and then hot-dip galvanized, there may be a slight difference between them. This difference is ultimately necessary to ensure that the tube and tubefitting can be connected. This clearance does not affect the strength of the structure.