Profile Section
180x75x2.5mm S355JR Uncoated Steel Sigma Profile
The 180x75x2.5mm steel Sigma profile is a cold roll-formed section to EN 10162 with a stiffened, indented 180 mm web, 75 mm flanges with 25 mm edge lips and 2.5 mm sheet thickness, weighing a nominal 7.78 kg/m. Produced to order in uncoated S355JR 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 uncoated cold-rolled structural strip in grade S355JR (EN 10025), minimum yield about 355 MPa. Choose it when the same section has to carry more load than S235JR. The surface is bare — specify paint or hot-dip galvanizing in the quote for outdoor use.
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.
Add to Quote Request
Select length and quantity to add to your quote cart
Minimum order: 33 pieces
Minimum total length: 390 m
Optional made-to-order requirements — added to this line for our production team.
Applications & Usage
Sigma 180x75x2.5 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. S355JR is the higher-strength uncoated grade for load-bearing purlins, columns and frames where S235JR would need a heavier section. At a nominal 7.78 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 | 180mm × 75mm × 2.5mm |
| Weight per Meter | 7.783 kg/m |
| Material | Steel |
| Alloy/Grade | S355JR |
| Standard | EN 10162 / EN 10346 |
| Profile Type | Sigma (Σ) |
| Edge Lip (c) | 25 mm |
| Developed Width | ≈ 397 mm |
| Cross-Section Area | ≈ 9.91 cm² |
| Moment of Inertia Iₓ | ≈ 503.2 cm⁴ |
| Moment of Inertia Iᵧ | ≈ 76.3 cm⁴ |
| Section Modulus Wₑₗ,ₓ | ≈ 55.14 cm³ |
| Section Modulus Wₑₗ,ᵧ | ≈ 15.29 cm³ |
| Minimum Production Run | 3 t |
| Finish | S355JR Uncoated |
| Available Lengths | 6m, 12m |
| Standard Length | 6 m |
| Minimum Order Length | 390 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, S355JR). Deflection is not checked and usually governs long spans. Indicative only — confirm with a project calculation.
| Span | Max UDL |
|---|---|
| 2 m | ≈ 26.10 kN/m |
| 3 m | ≈ 11.60 kN/m |
| 4 m | ≈ 6.53 kN/m |
| 5 m | ≈ 4.18 kN/m |
| 6 m | ≈ 2.90 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
Uncoated S355JR high-strength cold-rolled strip. Paint or hot-dip galvanize after forming when corrosion protection is required.
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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