Profile Section
300x100x3.5mm S350GD+Z Galvanized Steel Sigma Profile
The 300x100x3.5mm steel Sigma profile is a cold roll-formed section to EN 10162 with a stiffened, indented 300 mm web, 100 mm flanges with 30 mm edge lips and 3.5 mm sheet thickness, weighing a nominal 15.84 kg/m. Produced to order in galvanized S350GD+Z steel, the Σ geometry moves the shear centre towards the section centroid — higher load capacity and less twist than an equivalent C profile at the same weight. This variant is pre-galvanized structural strip S350GD+Z275 to EN 10346, minimum yield about 350 MPa. The zinc coating is already on the coil, which is why this is the standard grade for outdoor purlins and solar structures.
Made to Order — Roll Formed
This profile is roll-formed to order in your exact length (1–15 m; longer on project basis). Minimum production run is approx. 3000 kg per size and grade. Add your sizes to a quote request and our team confirms lead time and pricing within one business day.
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Minimum order: 16 pieces
Minimum total length: 192 m
Optional made-to-order requirements — added to this line for our production team.
Applications & Usage
Sigma 300x100x3.5 is the weight-optimized choice for solar tracker and fixed-tilt rafters, long-span purlins, racking and shelving uprights, and light steel structures where every kilogram of steel and foundation load counts. The indented web raises buckling resistance, allowing thinner material for the same performance. S350GD+Z275 is the usual specification for solar mounting, roof and wall purlins, and any outdoor structure that needs a structural yield plus a zinc coating from the mill. At a nominal 15.84 kg/m and cut-to-length production from 1 to 15 m, material usage is optimized with no offcuts on site. Minimum production run is approximately 3000 kg per size and grade — add your sizes to a quote request and our team confirms exact tonnage, lead time and delivered pricing.
Technical Specifications
| Specification | Value |
|---|---|
| Dimensions | 300mm × 100mm × 3.5mm |
| Weight per Meter | 15.841 kg/m |
| Material | Steel |
| Alloy/Grade | S350GD+Z275 |
| Standard | EN 10162 / EN 10346 |
| Profile Type | Sigma (Σ) |
| Edge Lip (c) | 30 mm |
| Developed Width | ≈ 577 mm |
| Cross-Section Area | ≈ 20.18 cm² |
| Moment of Inertia Iₓ | ≈ 2758.2 cm⁴ |
| Moment of Inertia Iᵧ | ≈ 260.4 cm⁴ |
| Section Modulus Wₑₗ,ₓ | ≈ 181.76 cm³ |
| Section Modulus Wₑₗ,ᵧ | ≈ 36.86 cm³ |
| Minimum Production Run | 3 t |
| Finish | S350GD+Z Galvanized |
| Available Lengths | 6m, 12m |
| Standard Length | 6 m |
| Minimum Order Length | 192 m |
| Cut-to-Length Range | 1000 – 15000 mm |
Indicative elastic section properties computed from the nominal centerline (thin-walled, corner radii ignored). For preliminary sizing only — not a substitute for a stamped structural calculation.
Indicative load span (single span, simply supported)
Allowable uniformly-distributed load (kN/m) limited by elastic bending about the strong axis (γ = 1.5 on yield, S350GD+Z275). Deflection is not checked and usually governs long spans. Indicative only — confirm with a project calculation.
| Span | Max UDL |
|---|---|
| 2 m | ≈ 84.82 kN/m |
| 3 m | ≈ 37.70 kN/m |
| 4 m | ≈ 21.21 kN/m |
| 5 m | ≈ 13.57 kN/m |
| 6 m | ≈ 9.42 kN/m |
Made to Order — Roll Formed
This profile is roll-formed to order in your exact length (1–15 m; longer on project basis). Minimum production run is approx. 3000 kg per size and grade. Add your sizes to a quote request and our team confirms lead time and pricing within one business day.
Cut to exact length
Any length from 1 to 15 m — no offcut waste on site
Material options
Pre-galvanized S350GD+Z275 structural strip to EN 10346. Zinc coating is applied to the coil before roll forming.
In-line punching
Mounting holes and slots punched to your drawing during roll forming
Certified quality
Produced to EN 10162; EN 10204 3.1 mill certificates available
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