Scaffolding hardware · galvanised steel tubes
Scaffold tubes
Scaffold tubes are galvanised steel tubes that build the load-bearing frame of any tube-and-fitting scaffold. Riyadh Timber stocks **48.3 mm OD tubes with 3.2 to 4 mm wall thickness in 2, 3, 4, 5, and 6 m lengths, certified to EN 39 and BS 1139** — the standard scaffold tube on Saudi towers, infrastructure, and Vision 2030 mega-projects.
What is a scaffold tube?
A scaffold tube is a galvanised steel tube of 48.3 mm outer diameter used as the structural member of tube-and-fitting scaffolds. Standard wall thickness is 3.2 to 4.0 mm, lengths 2 to 6 m, with steel grade S235JR per EN 10025. Riyadh Timber stocks tubes certified to EN 39 and BS 1139 for Saudi tower and infrastructure projects.
Scaffold tubes form standards (vertical members), ledgers (horizontal members), transoms (cross members), and braces (diagonals) when joined by EN 74-1 clamps. The 48.3 mm OD is the international standard — every scaffold clamp, base jack, U-head, and putlog couples to this exact diameter.
Galvanising to EN ISO 1461 with ≥ 60 micron coating is required for Riyadh climate. Painted tubes corrode within 6 to 12 months of site exposure, while hot-dip galvanised tubes survive 10+ years of continuous service with minor surface maintenance.
Why are EN 39 scaffold tubes mandatory on Saudi sites?
EN 39 tubes are mandatory because they deliver guaranteed S235JR steel grade with tensile strength ≥ 235 N/mm² and uniform wall thickness. Off-spec tubes with thin walls or low-grade steel buckle under compression — the leading cause of scaffold collapse. Saudi project consultants and Aramco/SABIC inspectors reject any uncertified tube above 6 m.
EN 39 specifies the wall thickness at 3.2 mm or 4.0 mm class, the steel grade at S235JR or S275JR, and the dimensional tolerance on outer diameter and straightness. Each tube is mill-marked with the standard reference, manufacturer, and steel grade.
Compared to general-purpose steel tubes, EN 39 tubes carry test certificates for tensile strength, yield strength, and elongation. Riyadh Timber's tubes ship with mill certificates and on-request third-party verification reports for Vision 2030 mega-projects.
What are the specifications of scaffold tubes?
Scaffold tubes ship in 48.3 mm OD with wall thickness 3.2 mm (light duty) or 4.0 mm (heavy duty), lengths 2, 3, 4, 5, and 6 m. Steel grade S235JR or S275JR per EN 10025, tensile ≥ 235 N/mm², yield ≥ 235 MPa. Hot-dip galvanised to EN ISO 1461 with ≥ 60 micron coating thickness, certified to EN 39 and BS 1139.
| Outer diameter | 48.3 mm OD |
|---|---|
| Wall — light duty | 3.2 mm |
| Wall — heavy duty | 4.0 mm |
| Length 2 m | Mass 4.4 kg (3.2 mm wall) |
| Length 3 m | Mass 6.6 kg (3.2 mm wall) |
| Length 4 m | Mass 8.9 kg (3.2 mm wall) |
| Length 5 m | Mass 11.1 kg (3.2 mm wall) |
| Length 6 m | Mass 13.3 kg (3.2 mm wall) |
| Tensile strength | ≥ 235 N/mm² (S235JR) |
| Galvanising | ≥ 60 microns hot-dip |
| Straightness | ≤ L/600 deflection |
| Standards | EN 39 · BS 1139 · EN 12810 · EN 10025 |
Where are scaffold tubes used on a construction site?
Scaffold tubes are used in all tube-and-fitting scaffold construction: tower scaffolds, facade access frames, falsework towers, temporary roofs, and complex shoring. The same 48.3 mm tube serves as standards, ledgers, transoms, and braces by changing length and clamp type at each joint.
- 01
Tube-and-fitting tower scaffolds
Vertical standards at 1.8 to 2.4 m bay spacing, ledgers at 2 m vertical lift heights, with diagonal bracing every fourth bay. EN 39 tubes joined by EN 74-1 clamps.
- 02
Facade access scaffolds
Cantilever brackets, drop-down frames, and protected hoists assembled from scaffold tubes for high-rise facade cladding, painting, and maintenance work.
- 03
Falsework towers above 4 m
Heavy-duty falsework using 4.0 mm wall tubes for slab and beam shoring above the reach of single jacks. Engineer-stamped erection drawings required.
- 04
Temporary roofs and weather covers
Tube frames clad with sheeting form temporary roofs over critical pours, archaeological digs, or weather-sensitive site activities — typical tube spans 6 to 8 m.
- 05
Trench and excavation supports
Lateral tube struts brace deep excavations and trench walls, sized to soil pressure and depth per project geotechnical reports.
How do scaffold tubes compare with shoring jacks for support work?
Scaffold tubes deliver clear heights up to 8 m or more in falsework towers, while single shoring jacks reach only 3.5 m. Tubes require multiple components — clamps, base jacks, U-heads — and engineer-stamped drawings. Jacks erect 60% faster but limit clear height. Tower projects use both: tubes for falsework, jacks for slab shoring.
On floor-by-floor tower work with 3 to 3.5 m clear heights, shoring jacks are the working answer. On infrastructure projects with viaduct decks 5 to 8 m above ground, scaffold-tube falsework or modular shoring towers are specified. The choice depends on clear height and crew skill mix.
Tube falsework permits any height, any plan geometry, and complex headroom — but requires a competent scaffolder and a stamped erection drawing. Single jacks are quick but limited to 3.5 m and a regular grid spacing.
| Attribute | Scaffold tube falsework | Shoring jack |
|---|---|---|
| Clear height | Up to 8 m+ | 1.8 to 3.5 m |
| Load capacity | Variable, depends on assembly | 20 to 35 kN single |
| Erection time | Slow — multi-component | Fast — single piece |
| Adjustability | Tube length — coarse | Threaded collar — fine |
| Skill required | Competent scaffolder | General labour |
| Best fit | Falsework above 4 m | Slab shoring 3 to 3.5 m |
| Indicative price | SAR 28 to 95 / tube + clamps | SAR 75 to 280 / jack |
How do I choose the right scaffold tubes for my project?
Match tube length to bay spacing: 2 m for ledgers in tight grids, 3 to 4 m for general ledgers and transoms, 5 to 6 m for tall standards. Specify 3.2 mm wall for general scaffolds, 4.0 mm wall for falsework above 4 m or heavy-load applications. Always specify EN 39 galvanised tubes — never plain or painted carbon steel.
Estimate tube length at 1.4 to 1.7 m of tube per square metre of working scaffold. A 30 × 6 m facade scaffold of 4 lifts requires approximately 750 to 900 m of total tube length, plus clamps and accessories. Add 10% spare against site loss, damage, and miscount.
Hot-dip galvanised tubes resist Riyadh's coastal humidity and dust storms. Painted finish corrodes within 6 to 12 months on exposed sites and is not accepted on Vision 2030 mega-projects. Specify ≥ 60 micron coating thickness to EN ISO 1461.
How are scaffold tubes installed on a Riyadh site?
Install tubes on base plates over sole boards on compacted ground, plumbed to within 1° vertical, joined by clamps torqued to 50 Nm at every standard-to-ledger intersection. Bracing diagonals at every fourth bay, ties to building face at every second lift on facade work. Inspect at each lift completion before the next is built.
Sole boards distribute the standard base load over the floor below, preventing point loading on green concrete or screed. Plumbing is checked with a spirit level on two faces of each standard. The base jack threaded collar takes the final fine height adjustment.
Ties to the building face transfer wind and lateral loads from the scaffold to the structure. On facade scaffolds above 8 m, ties are mandatory at every second lift and every third bay horizontally. Tie pull-out tests are required before the scaffold is loaded.
Do scaffold tubes meet Saudi Building Code requirements?
Riyadh Timber's scaffold tubes meet EN 39 dimensional and material standards, BS 1139 scaffold tube standards, EN 12810 access scaffolds, and SBC 502 site-safety provisions. Each tube ships with mill certificate of steel grade, galvanising thickness report, and on-request third-party tensile test reports.
Mill certificates list the steel grade (S235JR or S275JR), tensile strength, yield strength, elongation at break, and galvanising thickness. The site QC team logs the tube batch and inspection date on the formwork erection record. Tubes failing in-service inspection — bent, dented, corroded — are tagged and removed.
Which Saudi projects use scaffold tubes from Riyadh Timber?
Riyadh Timber tubes support NEOM, Red Sea, Diriyah, Qiddiya, and New Murabba, the King Abdullah Financial District towers, Riyadh Metro stations, and high-rise residential projects across Olaya, Hittin, and Al Malqa. Volume contracts run from 500-tube site supplies up to 30,000-tube tower mobilisations.
- Vision 2030 mega-projects: NEOM, Red Sea, Diriyah, Qiddiya, New Murabba — facade and superstructure scaffolds.
- King Abdullah Financial District and Olaya towers — facade access and falsework towers.
- Riyadh Metro stations and elevated viaducts — temporary scaffold roofs and access frames.
- High-rise residential in Hittin, Al Malqa, Al Yasmin — facade rendering and final-finish scaffolds.
What are common questions about scaffold tubes?
**500 m of total tube length** is the effective delivery minimum, sufficient for a small facade scaffold of 50 m² coverage. Smaller orders are picked up from our Olaya yard or are bundled with existing project shipments.
3.2 mm tubes are **light duty for general scaffolds up to 4 lifts and 24 m height**. 4.0 mm tubes are heavy duty for falsework, towers above 24 m, and high-load applications. Both share the 48.3 mm OD and accept the same EN 74-1 clamps and base jacks.
Yes. Our scaffold tubes ship with **EN 39 mill certificates and on-request third-party tensile and galvanising test reports**. These satisfy Aramco SAES-Q-001 and SABIC engineering-standard reviews on industrial and petrochemical projects.
Hot-dip galvanised tubes survive **10+ years of continuous site use** with cleaning and minor surface maintenance. Painted tubes corrode within 6 to 12 months in Riyadh's climate and are not accepted on Vision 2030 mega-projects.
Yes. **Cut-to-size service is available** for tubes between 1 and 6 m lengths, with cut ends reamed and end-coated against corrosion. Lead time 24 to 48 hours from cut list. Cut tubes carry the same EN 39 mill certificate as standard lengths.
Yes. **EN 74-1 clamps (fixed, swivel, sleeve, putlog), base jacks, U-heads, and sole boards** are stocked in matching quantities. A complete tube-and-fitting scaffold ships from our Olaya yard within 24 to 48 hours.
Yes — tubes that pass post-project inspection (no bends, dents, or corrosion below ≥ 60 micron galvanising) are reused on subsequent projects. **Riyadh Timber accepts old tubes for trade-in** against new orders on rental contracts, with credit based on remaining service life.
What products relate to Scaffold tubes?
Selections that complement the work in Saudi construction projects.
Need a quote on scaffold tubes for your project?
Send the scaffold drawing or facade dimensions and project duration. We respond with a formal quote within 4 working hours — tube quantities, lengths, total, lead time, and EN 39 certificates included.