What Is Certified Manufacturing? Standards OEMs Should Look For

Certified manufacturing means production under an independently audited, accredited quality system and recognized product approvals.
The value of a certificate depends on the accreditation and oversight behind it.
Classed components need classification society product approval and EN 10204 certification, beyond ISO 9001.

OEMs need to ensure that the proper certifications and part quality are maintained when fabricating with third-party suppliers. Especially for critical parts, relevant classification society approvals and third-partyird party witnessing are needed. This guide explains what certified manufacturing means, which standards to require, and how to verify a supplier's certificates.

Which certifications and approvals should OEMs look for?

Certified manufacturing is production under a quality management system and product approvals that an accredited, independent body has audited against a recognized standard.

To ensure that parts manufactured are compliant, OEMs should look out for suppliers with ISO 9001 as the quality baseline, EN 10204 material certifications, and classification society product approval for classed components. For the energy industry, suppliers should also conform to API standards.

Certification or approval	What it confirms	When to require it
ISO 9001:2015	An audited quality management system	All suppliers, as the baseline
Classification society product or type approval (American Bureau of Shipping, Bureau Veritas, DNV, Lloyd's Register, ClassNK, Korean Register, etc.)	A specific component type, manufacturing process, and quality controls assessed against classification requirements.	Components for classed vessels
IACS unified requirements	Technical requirements adopted by classification societies covering areas such as materials, testing, design, manufacturing, and documentation for classed components.	Classed vessel components
EN 10204 3.1 / 3.2	Material certification level (3.2 adds an independent witness)	Material conformance evidence
API 610, API 6A, API 20S (as applicable)	Equipment standards for energy and oil and gas	Energy and oil and gas assets

What should a supply chain team require in a supplier quality agreement?

A supplier quality agreement should specify the certification levels required, the right to audit, and non-conformance timelines. It should also require production only from OEM-controlled design files at the current revision.

OEM & Supplier Terms:

Required certifications and the EN 10204 level for each component.
Production only from OEM-released design files, with revision control.
Full traceability: material certificates, inspection records, and file version control.
The right to audit the facility on reasonable notice.
Non-conformance notification within a defined window.

Genuine parts originate from OEM-controlled design data and approved manufacturing processes, rather than unauthorized reverse-engineered alternatives often found in gray-market supply chains.

Does certified manufacturing apply to on-demand and legacy parts?

Certified manufacturing applies to on-demand and legacy parts exactly as it does to conventional production. The underlying quality, traceability, and certification requirements remain the same regardless of production method, although additional process qualifications may be required for certain manufacturing technologies.

On-demand parts still need ISO 9001, classification society product approval where applicable, and EN 10204 certification, produced from OEM-controlled files under a qualified process.

For any on-demand supplier, verify the same certificates and approvals you would require of a conventional manufacturer.

Frequently asked questions

Is ISO 9001 enough for classed marine or pressure components?

ISO 9001 is the baseline, but it is not enough on its own for classed or pressure-containing parts. Those typically require classification society product approval and EN 10204 material certification. Depending on the component, application, and classification requirements, either 3.1 or 3.2 certification may be specified. ISO 9001 confirms the quality system exists; the additional approvals confirm the specific component type and material meet the applicable requirements.

Why does certification scope matter when qualifying a supplier?

A certificate's scope defines which products, processes, and sites it covers. A supplier can hold a valid ISO 9001 certificate whose scope excludes the exact component or process in your order. In that case the certificate does not apply to your part. Always confirm the scope covers your component type, and not just that a certificate exists.

Key Takeaways

ISO 9001 is the baseline requirement. Classed components need classification society approval and EN 10204 on top.
Put OEM file control, audit rights, and traceability in the supplier quality agreement, not just a certification clause.
On-demand and legacy parts carry the same certification and accreditation requirements as conventional production.