PRODUCT 01.04 · ROUND TUBE
Round tube 1-1/4″ — 42.2 mm OD, wall 1.2–4.0 mm.
42.2 mm outside diameter, sold by the piece or the bundle, pre-galvanised or hot-dip. In a greenhouse it is gutter posts on small spans, end-frame bracing — a step up from 1″ where the post carries gutter and crop load.
The 42.2 mm OD is the outside dimension, not the bore. Wall thickness changes the weight and the stiffness far more than the diameter does, which is why we quote wall on every line: two tubes of the same diameter at 1.5 mm and 2.5 mm are different products with different prices and different deflection.
| Wall | kg/m | 6 m piece (kg) | 12 m piece (kg) |
|---|---|---|---|
| 1.2 mm | 1.21 | 7.3 | 14.6 |
| 1.5 mm | 1.51 | 9.0 | 18.1 |
| 1.8 mm | 1.79 | 10.8 | 21.5 |
| 2.0 mm | 1.98 | 11.9 | 23.8 |
| 2.5 mm | 2.45 | 14.7 | 29.4 |
| 3.0 mm | 2.90 | 17.4 | 34.8 |
| 4.0 mm | 3.77 | 22.6 | 45.2 |
Calculated as 0.02466 × wall × (OD − wall). Mill tolerance on wall is ±10 %, so treat these as planning figures.
- Outside diameter
- 42.2 mm
- Wall options
- 1.2 / 1.5 / 1.8 / 2.0 / 2.5 / 3.0 / 4.0 mm
- Length
- 6 m / 12 m / up to 16 m / cut to bay
- Grade
- Q235B standard · Q355B on request
- Standard
- EN 10219 cold-formed hollow section
- Coating
- Z275 pre-galvanised · hot-dip ISO 1461
- Ends
- plain · bevelled · swaged
- Packing
- hexagonal bundle, tagged
- Typical duty
- Gutter posts on small spans, end-frame bracing
- Fits clamp
- Ø42
- Bundle
- 37–61 pcs
- Loading
- 40HQ for 6 m
What it pairs with
- 01Arch clamps and connectorsThe clamp bore must match this OD→
- 02Crop support and trellisWire frames and hooks for this size→
- 03Tube weight and wall thicknessHow to read the weight table→
- 04Container loading of 6 m tubeWhy 6 m does not fit a 20GP→
Before you fix the wall
A 1.5 mm wall and a 2.0 mm wall look identical in a photo and differ by roughly a third in weight. If your drawing says “Ø42 tube” without a wall, ask for the wall in writing — otherwise you will be quoted the lightest commercial wall and compare it against a heavier competitor by accident.
Read next
Pages that answer the question this page raises.
- 04.01Round steel tubeRound galvanised steel tube for greenhouses: 1/2″ to 4″ outside diameter, wall 1.0–4.0 mm,→
- 04.06.01Arch clamps & connectorsArch clamps & connectors for greenhouse frames — cast or formed clamps that join arch to g→
- 08.07Tube weightSteel tube weight calculation: round, square, rectangular and oval sections, kg/m formulas→
- 08.09Container loadingGreenhouse frame container loading: 20GP and 40HQ internal dimensions, 6 m and 12 m tube, →
PRICE THIS SIZE
Quote 1-1/4″ tube against your take-off
Send the total metres or the piece list with lengths. We return price per piece, bundle count and loading.