Top 5 Wire Harness Certifications Every Buyer Should Know
From ISO 9001 basics to industry-specific requirements like IATF 16949 and AS9100, understand which certifications matter for your application and how to verify genuine compliance.
Proper certifications ensure your supplier has the systems, training, and processes for consistent quality
Quality certifications serve as shorthand for "this supplier has been independently audited and found to have proper systems in place." But with dozens of standards available, knowing which certifications matter for your specific application—and which are merely marketing—is essential for informed procurement decisions.
In this guide, we'll examine the five most important certifications for wire harness and cable assembly suppliers: what each one means, which industries require them, and how to verify that a supplier's certification is genuine and current.
Certification Quick Reference
| Certification | Industry Focus | Required For |
|---|---|---|
| ISO 9001 | General/All Industries | Baseline qualification |
| IATF 16949 | Automotive | OEM & Tier 1 supply |
| AS9100 | Aerospace & Defense | Military/commercial aviation |
| ISO 13485 | Medical Devices | FDA-regulated products |
| IPC/WHMA-A-620 | Wire Harness Specific | Workmanship standard |
ISO 9001: Quality Management Systems
What It Covers
- Documented quality management system
- Customer focus and requirements management
- Process control and continuous improvement
- Internal audits and management review
Key Statistics
- 1.2M+ organizations certified worldwide
- Current version: ISO 9001:2015
- 3-year certification cycle with annual audits
ISO 9001 is the foundation certification that virtually every serious manufacturer holds. It doesn't specify how to build a product—it specifies that you have documented systems for managing quality, handling customer requirements, controlling processes, and continuously improving.
Consider ISO 9001 the minimum baseline for any wire harness supplier. A supplier without ISO 9001 is a significant risk, indicating they may lack basic quality infrastructure. View our ISO 9001 certification details.
Verification Tip
Request a copy of the current certificate and verify it with the issuing registrar. Legitimate certificates include a registration number that can be verified on the registrar's database. Beware of certificates from unknown registrars or those that have expired.
IATF 16949: Automotive Quality Management
Beyond ISO 9001
- PPAP (Production Part Approval Process)
- APQP (Advanced Product Quality Planning)
- FMEA (Failure Mode and Effects Analysis)
- Statistical process control requirements
Who Requires It
- All automotive OEMs (GM, Ford, Toyota, etc.)
- Tier 1 suppliers to OEMs
- Often required at Tier 2 level
IATF 16949 builds on ISO 9001 with automotive-specific requirements developed by the International Automotive Task Force. If you're supplying wire harnesses for automotive applications—especially to OEMs or Tier 1 suppliers—this certification is typically mandatory, not optional.
The automotive industry's zero-defect expectations drive requirements like PPAP documentation, control plans, and measurement system analysis that go far beyond general ISO 9001. Learn more about our IATF 16949 capabilities.
"IATF 16949 changed how we operate. The documentation requirements alone—PPAP packages with dimensional reports, material certifications, process flow diagrams, control plans—add significant overhead. But there's a reason automotive quality is so good: these systems work. Every customer we serve, automotive or not, benefits from the discipline IATF requires."
Hommer Zhao
Cable Assembly Engineering Director
AS9100: Aerospace Quality Management
Key Requirements
- Configuration management
- First Article Inspection (FAI)
- Product safety and counterfeit part prevention
- Special process controls (crimping, soldering)
Traceability
- Full material traceability required
- Operator identification per operation
- Records retained 7-10+ years typically
AS9100 is the aerospace industry's quality standard, adding stringent requirements for traceability, configuration management, and risk assessment to the ISO 9001 foundation. The IAQG (International Aerospace Quality Group) maintains the OASIS database where all AS9100 certified suppliers are registered.
For aerospace wire harness applications, AS9100 certification is typically mandatory for commercial aviation and defense contracts. The standard's focus on counterfeit part prevention and product safety reflects aerospace's zero-tolerance for quality escapes. View our AS9100 certification.
ISO 13485: Medical Device Quality Management
Regulatory Alignment
- FDA 21 CFR Part 820 (US)
- EU MDR compliance support
- Design controls integration
- Risk management (ISO 14971)
Documentation Focus
- Device Master Record (DMR)
- Device History Record (DHR)
- Complaint handling and CAPA
ISO 13485 is designed specifically for the medical device industry, with requirements that align with FDA and EU regulatory expectations. Unlike ISO 9001's focus on continuous improvement, ISO 13485 emphasizes maintaining a validated state—changes require formal change control and risk assessment.
For cable assemblies used in medical devices, ISO 13485 certification demonstrates the supplier understands regulatory requirements and can provide the documentation needed for FDA submissions. View our ISO 13485 certification.
"Medical device customers ask questions about our quality system that other industries never think about. 'How do you handle field complaints?' 'What's your CAPA process?' 'Can you provide a Device History Record?' ISO 13485 gives us a framework to answer those questions confidently—and more importantly, to actually have those systems in place."
Hommer Zhao
Cable Assembly Engineering Director
IPC/WHMA-A-620: Cable and Wire Harness Assemblies
What It Covers
- Crimping quality criteria and inspection
- Soldering workmanship standards
- Wire routing and cable dressing
- Marking, labeling, and coiling
Three Classes
- Class 1: General electronics
- Class 2: Dedicated service equipment
- Class 3: High reliability (aerospace, medical)
Unlike quality management standards (ISO, IATF, AS), IPC/WHMA-A-620 is a workmanship standard that defines what "good" looks like for cable assembly manufacturing. It provides visual acceptance criteria with photos showing target, acceptable, and defect conditions for every manufacturing step.
Training and certification to IPC/WHMA-A-620 ensures your supplier's operators know exactly what quality standards to meet. The three class system (1, 2, 3) allows matching inspection rigor to application criticality. Learn more about our IPC/WHMA-A-620 certification.
"IPC-620 is different from other certifications—it's about the hands-on craft of cable assembly, not management systems. When our operators are IPC-620 certified, they understand exactly what a proper crimp looks like, what's acceptable, and what's a defect. There's no ambiguity, no 'good enough.' The standard has pictures for everything."
Hommer Zhao
Cable Assembly Engineering Director
Certification Comparison
| Certification | Audit Frequency | Focus | Cost to Maintain |
|---|---|---|---|
| ISO 9001 | Annual surveillance | Management system | $$ |
| IATF 16949 | Annual + customer audits | Automotive-specific QMS | $$$$ |
| AS9100 | Annual surveillance | Aerospace-specific QMS | $$$ |
| ISO 13485 | Annual surveillance | Medical device QMS | $$$ |
| IPC/WHMA-A-620 | Training renewal 2 yrs | Workmanship | $$ |
Frequently Asked Questions
Can a supplier hold multiple certifications?
Yes, and many do. For example, we maintain ISO 9001, IATF 16949, and IPC/WHMA-A-620 simultaneously. The certifications build on each other—IATF 16949 includes all ISO 9001 requirements plus automotive-specific additions. Holding multiple certifications demonstrates capability to serve diverse markets.
How do I verify a certification is genuine?
Request a copy of the certificate and check: (1) Issue date and expiration date—is it current? (2) Registrar name—is it a recognized accredited body? (3) Certificate number—can it be verified on the registrar's website? For aerospace, all AS9100 certificates must be in the IAQG OASIS database.
What if my supplier has ISO 9001 but I need IATF 16949?
ISO 9001 alone is insufficient for automotive OEM supply chains. However, some Tier 2 and Tier 3 applications may accept ISO 9001 with additional customer-specific requirements. For OEM or Tier 1 supply, IATF 16949 is typically non-negotiable. Discuss specific requirements with your customer before selecting a supplier.
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Verified Quality Certifications
We maintain ISO 9001, IATF 16949, and IPC/WHMA-A-620 certifications with annual third-party audits. Request our current certificates for your supplier qualification.