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N Mark for steel products for concrete

N Mark for steel products for concrete

N Mark for steel products for concrete

The N Mark certifies compliance with the requirements applying to steel products for concrete under the Instruction on Structural Concrete EHE-08​

The N Mark for steel products for concrete certifies conformity with the requirements of the Code on Structural Concrete EHE-08, which assures the manufacturer that their customers can benefit from the advantages that the EHE-08 reserves for officially recognised standards. For those not regulated by the Instruction, the objective is to provide demonstration of compliance with the national UNE or European EN standards and with other requirements demanded by customers.

The N Mark for steel products for concrete is accredited by the National Accreditation Entity (ENAC) and is an Officially Recognised Standard, in accordance with the Code on Structural Concrete (EHE-08).

  • Reinforced steel bars conforming with UNE 36068, UNE 36065, UNE-EN 10080, article 32 section 4.3.4 of Annex 13 of the Instruction on Structural Concrete EHE-08.
  • Reinforced bars with special ductile quality conforming with UNE 36065, UNE-EN 10080, article 32 section 4.3.4 of Annex 13 of the Instruction on Structural Concrete EHE-08.
  • Smooth and reinforced steel wires conforming with UNE 36731, UNE 36099, UNE-EN 10080, article 32 of the Instruction on Structural Concrete EHE-08.
  • Prestressed steel wires and strands conforming with UNE 36094, Article 34 of the Instruction on Structural Concrete EHE-08.
  • Non-alloy steel wire rod for conversion to wire for electrowelding or prestressing conforming with UNE 36066 or UNE-EN-ISO 16120-4.
  • Electrowelded steel mesh conforming with UNE 36060, UNE 36061, UNE 36092, UNE-EN 10080, article 33 of the Instruction on Structural Concrete EHE-08.
  • Basic electrowelded steel lattice framing conforming with UNE 36739, UNE-EN 10080:2006, article 33 of the Instruction on Structural Concrete EHE-08.
  • Distribution of steel products for concrete conforming with UNE 36820.
  • Passive steel framing for structural concrete (reinforcing steel) conforming with UNE 36831:1997, UNE-EN-ISO 17660-2:2008, article 33, sections 69.2, 69.3, 69.4, 69.5 and section 5.1.1 of Appendix 11 to the Code on Structural Concrete EHE-08.

AENOR, a conformity assessment company, is a leader in product certification. With more than 100,000 certified references, the AENOR​​ N Mark is present in over 40 countries and is among the top 5 product quality markings in the world. 

The AENOR N Mark is a voluntary marking that allows a company to demonstrate that its product complies with specific provisions compiled in a UNE, EN or ISO standard or in a technical specification. AENOR's robust inspection of the manufacturing processes and testing of end products allows licensees of the Mark to put products on the market with a high standard of quality, creating trust between the manufactures and the users of their certified products.​​​

The Code on Structural Concrete EHE-08, approved by Royal Decree 1247/2008, of 18 July, establishes a set of technical specifications that must be met by the products and execution processes included in this field. While voluntary, these certified products can boast quality markings that guarantee their compliance with standards, regulatory provisions or individual regulations from issuing agencies.

The AENOR N Mark bears the recognition of the Ministry of Public Works as an officially recognised logo under the EHE-08. Any product with the officially recognised logo is one with a level of guarantee higher than the minimum level required under EHE-08. The logo implies having undergone a rigorous product control during its manufacture; external verification with testing performed in independent laboratories accredited by ENAC, in accordance with the standard EN ISO 17025; audits and inspections of its facilities, raw materials and quality system. The companies that issue these certificates are accredited by ENAC in accordance with the standard EN ISO 17065 and are guaranteed by the Public Administration that handles official recognition (Royal Decree 1247/2008 approving the EHE-08).​

This way, the AENOR N Mark provides the following benefits:​​


The manufacturer

  • Better understanding of a product due to the exhaustive control the AENOR Mark establishes with respect to the same
  • Products that do not comply with relevant standards or regulations can be detected before they enter the market
  • Decreases production costs as a result of greater control during the manufacturing process
  • There are commercial grounds to introduce the product into new markets and facilitate access to works

Planners and builders

  • Streamlines the calculation and design of the structure
  • Favourable calculation criteria (lower safety coefficients for materials, small anchor lengths, etc.)
  • Before receiving the materials, it reduces the required documentary control and, in some cases, allows the company to avoid inspecting the raw materials, the manufacturer's facilities and the preliminary product testing
  • In the supply phase, this removes the need for experimental verifications, eliminating all on-site reception testing, which represents a significant saving on work quality controls

Technical management and ownership

  • Greater information on the products used on the work site and on their traceability, thus instilling greater confidence
  • Rigorous quality control at the factory
  • Simplified control programme
  • Savings on monitoring work
  • Accessibility to information from the factory control
  • Reduction of non-conforming products and associated costs
  • Quick intervention during incidences affecting product quality
  • Participation from an independent certification company and the Public Administration


The AENOR Mark is voluntary. Companies that want AENOR to certify their product must submit their application in accordance with the formats established by AENOR. This request includes both company information and product characteristics for those who request the certification.​

Once the documentation is analysed by AENOR technicians to verify that the products comply with implementation standards, the conformity assessment activities begin: ​


AENOR conducts a visit to the production centre, where:

  • ​a) ​An audit is carried out on the quality management system in accordance with the requirements of UNE-EN ISO 9001 regarding the production process.
  • b) The manufacturer's manufacturing process and production controls are inspected to ensure the product complies with the requirements of the standard.
  • c) Samples are taken for testing in the factory and are then sent to an accredited laboratory that carries out further testing included in the standards.


The laboratory performs the tests established by the standard and sends its report to AENOR.


Using all the information from the aforementioned activities, the Technical Certification Committee (an independent body formed by all stakeholders): manufacturers, the Administration, users, monitoring entities and AENOR) will either propose to AENOR that the Mark be granted, or request that one of the activities be repeated due to non-compliance.

Once the Certificate has been granted, the process will continue as the monitoring activities required to keep it must be performed. Conducts the auditing activities, inspection, sample taking and testing on a semi-annual or annual basis. The result is evaluated by the Technical Certification Committee who decides whether the AENOR certification is retained.

Once an organisation passes the certification process, it obtains: ​

  • The AENOR product certificate
  • A licence to use AENOR's Mark of a certified product, in accordance with the provisions of AENOR regulations
AENOR N Mark logo for a certified product​​

GlobalEPD Declarations

Environmental product declarations (EPD)

EPD for construction steel in accordance with Standard EN 15804

European Passport

​​The CE MARK is a passport for building products

The CE mark provides access to the European Economic Area for construction products