Profile Section
350x70x4mm Steel C Profile, Mill Finish
The 350x70x4mm steel C profile is a cold roll-formed lipped channel: 350 mm web, 70 mm flanges, 20 mm edge lips and 4 mm thickness, 15.72 kg/m. Roll-formed to order in Aluzinc steel, it is used for solar mounting structures, roof purlins and side rails, and light steel framing. This page shows the size in Aluzinc: steel strip with an aluminium–zinc alloy coating. The steel grade is confirmed in the quotation.
Made to Order — Roll Formed
This profile is roll-formed to order in your length (1–25 m). The minimum order is 5000 kg per size and material. Add your sizes to a quote request and we confirm lead time and price.
Add to Quote Request
Select length and quantity to add to your quote cart
Minimum order: 27 pieces
Minimum order: 5,000 kg per size
Optional made-to-order requirements — added to this line for our production team.
Applications & Usage
C 350x70x4 is used for solar mounting piles, rails and bracing, roof purlins and wall side rails, mezzanine joists and light steel framing. Holes and slots can be punched to your drawing. Aluzinc is chosen for roof and cladding substructures and other outdoor members where an aluminium–zinc coating is specified. Each size is roll-formed to order in lengths from 1 to 25 m. The minimum order is 5000 kg per size and material — add your sizes to a quote request and we confirm lead time and delivered price.
Technical Specifications
| Specification | Value |
|---|---|
| Dimensions | 350mm × 70mm × 4mm |
| Weight per Meter | 15.72 kg/m |
| Weight of a 6 m length | 94.3 kg |
| Weight of a 12 m length | 188.6 kg |
| Material | Steel |
| Alloy/Grade | Aluzinc (Al-Zn) |
| Standard | EN 1090-1 (CE, EXC2); coated strip to EN 10346 |
| Profile Type | C (lipped channel) |
| Edge Lip (c) | 20 mm |
| Developed Width | 500 mm |
| Cross-Section Area | 20.03 cm² |
| Moment of Inertia Iₓ | 3245.7 cm⁴ |
| Section Modulus Wₑₗ,ₓ | 185.47 cm³ |
| Radius of Gyration rₓ | 12.67 cm |
| Moment of Inertia Iᵧ | 99.2 cm⁴ |
| Section Modulus Wₑₗ,ᵧ | 17.95 cm³ |
| Radius of Gyration rᵧ | 2.22 cm |
| Centroid Distance eₓ | 1.48 cm |
| Available Lengths | 6m, 12m |
| Standard Length | 6 m |
| Minimum Order per Size | 5 t |
| Cut-to-Length Range | 1000 – 25000 mm |
Weight and section properties are nominal values from the mill catalogue table. Values marked ≈ are calculated from the section centerline.
Load guidance is shown only for materials with a stated steel grade; for Aluzinc (Al-Zn) the grade is confirmed in the quotation.
Made to Order — Roll Formed
This profile is roll-formed to order in your length (1–25 m). The minimum order is 5000 kg per size and material. Add your sizes to a quote request and we confirm lead time and price.
Cut to exact length
Any length from 1 to 25 m — no offcut waste on site
Material options
Aluzinc: steel strip with an aluminium–zinc alloy coating applied on the coil.
In-line punching
Holes and slots punched to your drawing
Certified production
EN 1090-1 factory production control (CE, up to EXC2); ISO 9001
Similar Sizes
Explore alternative dimensions that might suit your needs
Technical guides
S350GD, S420GD and DX51D+Z: coated steel grades to EN 10346 explained
What S350GD+Z275, S420GD+ZM310 and DX51D+Z mean: minimum yield and tensile strength of EN 10346 structural and forming grades, coating types and masses, and which grades we roll purlins from.
Read the guide →C, Z or Sigma purlins: how to choose the right cold-formed section
How C, C Plus, Z, Sigma and U cold roll-formed sections differ, where each is typically used, the size ranges available, and what to send for a quote.
Read the guide →Purlin coatings: black steel, galvanized Z275, Magnelis (ZM) or Aluzinc?
How the four material options for cold roll-formed purlins compare — grades, coating mass, cut-edge behaviour and typical exposure — and how to specify them.
Read the guide →Purlin sizes and weights: C, Z and Sigma section tables
Complete size tables for cold roll-formed C, C Plus, Z, Sigma, Sigma Plus and U sections: dimensions, weight per metre, area, Ix and Wx from the mill catalogue.
Read the guide →Steel coatings
Galvanized purlins: pre-galvanized Z275 C, Z and Sigma sections
Cold roll-formed C, Z, Sigma and U sections from pre-galvanized S350GD+Z275 and S420GD+Z275 strip: size ranges, lengths up to 25 m, punched holes and how to order.
View coating →Magnelis (ZM) purlins: zinc–aluminium–magnesium coated C, Z and Sigma sections
Cold roll-formed purlins and girts from ZM310 and ZM350 coated strip in S350GD, S420GD and S450GD — for agricultural, coastal and other aggressive environments.
View coating →Aluzinc purlins: aluminium–zinc coated C, Z and Sigma sections
Cold roll-formed C, Z, Sigma and U sections from Aluzinc (AZ) aluminium–zinc coated strip: where it fits, size ranges, lengths up to 25 m and how to order.
View coating →