The cold-formed welded structural steel grade behind every SCAFFWORKS cuplock standard and ledger. Material properties, dimensional tolerances, and how to verify compliance on delivery.
EN10219 is the European standard for cold-formed welded structural hollow sections — including the circular tube used in cuplock standards and ledgers. The standard covers steel grade, dimensional tolerance, mechanical properties, surface finish, and inspection requirements. Tubes labelled to EN10219 have been certified against this specification by the producing mill.
Scaffworks specifies EN10219 tube for every structural member we manufacture. The standard ensures the tube has the correct yield strength, wall thickness consistency, and weld integrity to support the design loads assumed in scaffolding engineering calculations.
Our standards and ledgers use the following tube specification:
| Property | Value | Notes |
|---|---|---|
| Standard | EN 10219-1 & -2 | Cold-formed welded structural hollow sections |
| Steel grade | S235JR / S275JR | S355JR available on request for high-load applications |
| Outside diameter | 48.3 mm | Standard cuplock tube OD |
| Wall thickness | 3.2 mm (option: 3.0 mm) | 3.2 mm is industry standard for full-load applications |
| Yield strength (S235JR) | ≥ 235 N/mm² | Minimum guaranteed yield |
| Yield strength (S275JR) | ≥ 275 N/mm² | Minimum guaranteed yield |
| Tensile strength (S235JR) | 360–510 N/mm² | Ultimate strength range |
| Charpy impact | 27 J at +20°C | Notch toughness — the "JR" suffix |
| Elongation | ≥ 24% | Ductility — important for ductile failure modes |
| Dimension | Tolerance |
|---|---|
| Outside diameter | ±0.5 mm or ±1% (whichever is greater) |
| Wall thickness | ±10% |
| Length | +150 / −0 mm for standard mill lengths |
| Straightness | ≤ 0.2% of total length |
| Weld bead height | internal: ≤ 0.6 mm + 0.1×t external: ≤ 0.4 mm + 0.05×t |
Wall thickness is the single biggest determinant of a standard's load capacity. Yet it is also the most common place that commodity-grade scaffolding fails to match its claim — visually, two tubes can look identical, but a 2.6 mm wall tube has roughly 19% less cross-sectional steel than a 3.2 mm wall tube, and the loss in compressive capacity is similar.
Verify on delivery. Always spot-check incoming tube against the documented wall thickness. A handheld digital caliper or wall-thickness gauge takes 10 seconds per check. If you receive tube that doesn't match the spec, reject it before erection.
When you buy or rent cuplock from any supplier, verify compliance by asking for:
A tube marked "EN10219" still has to be the right grade, OD, and wall thickness for cuplock service. Confirm all four:
Our manufacturing process starts with raw EN10219 tube from accredited mills. Each delivery batch is sampled at our Umm Al Quwain facility for wall thickness and dimensional check before it enters the cutting line. This is one of the controls that lets us guarantee load capacity on every finished standard.
See also: Cuplock system specifications · Blog: What is EN10219 steel and why it matters
Our engineering team prepares stamped drawings and load checks for UAE projects.