What material are the tubefittings made of?

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

Is the given diameter the inner diameter of the tubefitting or the diameter of the congruent tube?

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.

I have a slightly larger/smaller tube. Is the mounting possible with the use of your tubefittings?

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.

Are the tubefittings suitable for outdoor or indoor use only?

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.

Can the fittings be painted in a different colour?

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.

What method is used for zinc plating of the fittings (galvanizing or hot-dip galvanizing)

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

Are hex set screws included (with a purchased fitting)?

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

What is the maximum load of the tubefittings

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.

How are the tubes fixed in the tubefittings

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.

What kind of a hex key do I need?

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)

What are the tubefittings' threads?
  • - 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

Why is there sometimes clearance between the tubefitting and the tube?

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.