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N Mark for hollow steel sections

N Mark for hollow steel sections

N Mark for hollow steel sections

The aim of the N Mark for hollow structural and non-structural steel sections is to ensure compliance with relevant product standards in order to satisfy customers

The objective of the N Mark for hollow steel sections for structural and non-structural uses is to make it easier to demonstrate compliance with Spanish or European standards and the customer requirements

Cold-formed non-alloy fine-grained steel ​hollow structures for the construction industryUNE-EN 10219-1:1998 and UNE-EN 10219-2:1998
Cold-formed calibrated welded pipesUNE-EN 10305-3:2003
Square and rectangle cold-formed calibrated welded pipesUNE-EN 10305-5:2004
Non-alloy steel welding and screw-in pipesUNE-EN 10255:2005

As a compliance assessor, AENOR is a leading product certification entity. With over 100,000 certified references throughout more than 40 countries, the AENOR N Mark is among the top 5 product quality marks 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. This demonstration of compliance during the manufacturing and testing of the final products, based on a rigorous control performed by AENOR, will allow licensees of the Mark to put their products on the market with a high standard of quality, instilling confidence in the users of these certified products.

This way, the AENOR N Mark can provide the following advantages:

The manufacturer

  • Affords greater knowledge of the product via the exhaustive control set forth by the N​ Mark
  • Products that do not comply with relevant standards or regulations can be detected before they enter the market
  • Lowers the production costs since there is greater control during the manufacturing process.
  • There are commercial grounds to introduce the product into new markets and facilitate access to works

Business providers and monitoring agents

  • Guarantees that the product has undergone prior verification to determine its compliance with minimum requirements
  • Products with long-lasting confidence. Product assessments are ongoing, guaranteeing compliance with the initial certified provisions
​ ​

Public Administrations

  • ​​Guarantees that the prescribed product will comply with the applicable statutory requirements
  • Transparency of the AENOR certification process.
  • Balance of interested parties in decisions on certified products

The end user

  • Confidence from knowing that the product has undergone prior verification
  • Credibility: the product is assessed by a recognised certification company​​ ​​


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 application must include information about the company and the characteristics of the products for which certification is sought.

Conformity assessment activities will commence once AENOR experts have analysed the documents to check that the products comply with the applicable standards:


A visit is made to the production centre to carry out the following procedures:

  • a) the quality management system is audited in accordance with the UNE-EN ISO 9001 requirements that are directly related to 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 at the factory and to send to an accredited laboratory to perform the tests included in the standards.


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


Using all the information on the activities performed, the Technical Certification Committee (independent body comprising all the interested parties: 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