R257 Reinforcing Steel Mesh — 7 mm Wire, 2.57 cm²/m
R257 mesh is a structural (R-type) welded fabric with 7 mm longitudinal wires at 150 mm pitch, delivering 2.57 cm²/m cross-sectional area. Supplied in standard sheets (~6.0 × 2.3 m) to DIN 488-4 and EN 10080 for international B2B export.
R257 Mesh: Technical Specification
R257 welded fabric is a structural R-type mesh produced to DIN 488-4 and EN 10080. The “R” classification indicates that reinforcement runs primarily in one direction — the longitudinal wires carry design loads, while transverse wires maintain spacing and geometry during concrete placement and curing.
With a 7 mm longitudinal wire diameter at 150 mm pitch, R257 provides 2.57 cm²/m — a moderate reinforcement ratio that sits between the lighter R188 and the widely specified R335. It is particularly suited to ground-bearing slabs with intermediate loading, lightweight suspended elements, and infill panels where the structural engineer has calculated a reinforcement demand in this range under EN 1992-1-1 (Eurocode 2).
Key Dimensional Data
| Parameter | Value |
|---|---|
| Designation | R257 (structural, single-direction) |
| Longitudinal wire diameter | ~7 mm |
| Longitudinal pitch | 150 mm |
| Cross-sectional area | ~2.57 cm²/m |
| Standard sheet size | ~6.0 × 2.3 m (typical) |
| Steel grade | B500A / B500B |
| Governing standard | DIN 488-4 / EN 10080 |
| Unit weight (approx.) | ~3.0 kg/m² (indicative; confirm per order) |
Exact sheet dimensions and wire tolerances confirmed on Mill Test Certificate. Contact us for project-specific data sheets.
Steel Grade & Material Properties
R257 mesh is produced from B500A or B500B reinforcing steel, meeting the ductility and bond requirements of DIN 488 and EN 10080.
500 MPa Yield Strength
Characteristic yield Re,k = 500 MPa minimum. Both B500A and B500B classifications fully satisfy Eurocode 2 design requirements for reinforced concrete.
Normal Ductility (B500A)
B500A grade: k ≥ 1.05 (ratio of tensile to yield strength), Agt ≥ 2.5% (uniform elongation at fracture) — the standard ductility class for welded mesh applications.
Welded Joint Integrity
All welded intersections meet DIN 488-4 shear strength requirements. Welding process per DIN EN ISO 17660, ensuring consistent structural performance in concrete.
Typical Applications for R257 Mesh
R257 occupies a practical mid-range position in the R-series. It is specified when R188 is insufficient but the design does not yet demand the reinforcement ratio of R335. Typical applications include:
- Ground-bearing slabs with moderate live loads — light industrial floors, warehouses, and commercial premises with racking or fork-lift traffic where the design engineer has calculated a steel area requirement around 2.5 cm²/m.
- Residential suspended ground floors — reinforced concrete slab construction over voids or compressible fills.
- Road and pavement sub-base reinforcement — concrete roads and hardstandings subject to light vehicle loads.
- Precast panel reinforcement — cladding and non-structural wall panels where low weight per sheet is a handling advantage.
- Crack-control mesh in composite deck slabs — placed in the tension zone of profiled composite slabs to limit crack widths under service loading.
Where a higher reinforcement area is required in both directions simultaneously, Q-type mesh (square configuration) may be more appropriate. Discuss your project requirements with our team.
Browse the full mesh range →Export Packaging & Documentation
R257 mesh is shipped in seaworthy bundles with a complete documentation set for customs clearance and project compliance.
Container & Break-Bulk Packing
Sheets are bundled into packs of approximately 2 tonnes, strapped and protected for ocean transit. Packs are sized for standard 20- or 40-foot container loading or break-bulk stowage depending on destination.
Full Document Package
Every consignment includes: Mill Test Certificate (EN 10204 3.1), Certificate of Origin, CE Declaration of Performance (DoP), packing list, and commercial invoice. Third-party inspection and additional customs documentation available on request.
Compare R257 with Related Mesh Grades
Select the right mesh grade for your reinforcement specification.
R188 — 6 mm / 1.88 cm²/m
Lighter structural mesh for low reinforcement-ratio slabs, footpaths, and crack-control applications.
View R188 →R335 — 8 mm / 3.35 cm²/m
The most widely used R-series grade. Suitable for most residential and commercial suspended and ground-bearing slabs.
View R335 →Full Mesh Range
Explore the complete R- and Q-series welded fabric range, including bespoke panels for project-specific specifications.
All Mesh Products →Frequently Asked Questions — R257 Mesh
How is the 2.57 cm²/m area calculated for R257 mesh?
What steel grade is R257 mesh supplied in?
What is the difference between R257 and R335 mesh?
Can R257 mesh be used in seismic zones?
What minimum order quantities apply to R257 mesh export?
Source German-standard rebar with full export documentation
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