Product quality is a commitment and responsibility we share with our supplier partners and customers. It is of paramount importance to us and, we operate to the highest quality control procedures and processes.

In serving our markets, we are required to hold stringent quality approvals and accreditations. We follow robust quality control procedures from initial enquiry through production and delivery, in line with industry and customer regulations and standards.

A full list of our certifications is available below.

Quality & Regulatory Approvals

We hold various quality & regulatory approvals, including AS9100 Rev D, ISO 9001, ISO 14001 & ISO 18001. We ensure the safety of our employees, exceed our customers’ quality expectations, promote measures to reduce wastage and non-conformance, and fulfil our responsibility in preventing environmental damage.

  • AS9100, EN9100:2018 Quality Management System
  • ISO 14001 Environmental Management
  • ISO 18001 Health & Safety


Sigma also holds multiple Nadcap accreditations. Nadcap sets the global standard for the aerospace, defence and related industries, ensuring manufacturing process and product assessments and certification services are provided for the sole purpose of reducing total cost, adding value and facilitating relationships with suppliers. Sigma holds the following Nadcap Approvals:

  • Welding & Brazing
  • Non Destructive Testing
  • Chemical Processing
  • Heat Treatment

Industry Accreditations 

JOSCAR (the Joint Supply Chain Accreditation Register) acts as a single repository for pre-qualification and compliance information. Therefore, using JOSCAR aids us in streamlining our assurance processes and determining if a supplier is compliant.

  • JOSCAR (Joint Supply Chain Accreditation Register)

In addition to our quality approvals, we have numerous bespoke customer approvals to manufacture and supply critical parts and components to the airframe and power & systems markets.

Contact Sigma

Additional details of our Quality Approvals are available upon request by getting in contact with us.