Overview
EN ISO 16426:2002 - Fasteners: Quality assurance system (ISO 16426:2002) is a CEN-endorsed International Standard that defines requirements for a fastener quality assurance system. Its primary objective is to reduce or prevent production of non‑conforming fasteners and to approach a zero defects objective for specified characteristics. The standard covers the supply chain from receipt of raw material through manufacturing, finishing and delivery to the distributor or user (installer).
Key topics and requirements
- Scope and objective: Prevention-focused quality assurance for mechanical fasteners to minimize non-conformities and approach zero defects.
- Control plan: A written control plan that includes prototype, initial and full production phases, advanced quality planning, process FMEA and in‑process controls.
- Selected product characteristics: Customer-designated critical dimensions, mechanical or performance features must be included in the control plan and jointly agreed ppm and/or Cpk/C value targets and evaluation methods.
- Traceability: Full traceability via a unique manufacturing lot number (or distributor trace number) linking finished parts back to raw material heat/cast numbers and process records.
- Documentation: Manufacturers must retain lot documentation (heat analysis, heat treatment, mechanical properties, dimensions, finish, performance data where applicable) and provide it on request. Records are to be preserved for at least 10 years from the date of sale.
- Lot integrity and handling: Manufacturing lots must not be commingled; lot contamination is prohibited. Deliveries should be in original, unopened, sealed manufacturer/distributor packaging unless otherwise agreed.
- Delivery and labelling: Shipping documents and labels must identify fastener designation and the manufacturing lot or trace number plus manufacturer/distributor identification and country of origin.
- Product continual improvement: Encourages return and analysis of non‑conforming parts to drive process improvements and reduced ppm.
Applications and users
EN ISO 16426 is intended for practical use by:
- Fastener manufacturers implementing prevention-based quality systems
- Distributors/stockists (alteration, repackaging, pass-through) managing traceability and labelling
- Procurement and quality engineers who specify critical fastener characteristics and ppm/Cpk targets
- Assemblers and installers requiring traceable, verifiable fasteners for safety‑critical applications
- Regulatory and compliance teams verifying supplier quality assurance practices
This standard is especially relevant where fastener failure has safety or high‑cost consequences (automotive, aerospace, construction, heavy machinery).
Related standards
- ISO 3269:2000 - Fasteners - Acceptance inspection (statistical detection system)
- ISO 9000:2000 - Quality management systems - Fundamentals and vocabulary
- ISO 15330:1999 - Fasteners - Preloading test for detection of hydrogen embrittlement
Keywords: EN ISO 16426:2002, fastener quality assurance system, traceability, manufacturing lot number, control plan, zero defects, ppm, Cpk, fasteners standard.
