Quality isn't a department at HERDAR — it's a system that permeates every process, from raw material receipt to final shipment. Our ISO 9001:2015 certification is the foundation, but our commitment to quality extends far beyond compliance.

The ISO 9001 Framework

Our quality management system (QMS) is built around seven core principles: customer focus, leadership engagement, process approach, evidence-based decision making, relationship management, improvement, and people engagement. Each principle is operationalized through documented procedures, training programs, and performance metrics.

Every production batch receives a unique traceability code linking it to raw material lots, machine settings, operator credentials, and inspection results. This traceability enables rapid root-cause analysis if any quality issue emerges — even years after production.

Incoming Material Control

Quality begins before production. All raw materials — polyurethane compounds, steel cores, bearing assemblies, fasteners — undergo incoming inspection against specification sheets. We test Shore hardness, tensile strength, dimensional accuracy, and chemical composition for every lot.

Materials that fail incoming inspection are quarantined and returned to suppliers with full documentation. Our supplier scorecard tracks defect rates, delivery performance, and responsiveness, driving continuous improvement across our supply base.

In-Process Inspection

Quality checks occur at critical process stages:

  • Pre-molding — Compound viscosity and temperature verification
  • Post-molding — Dimensional accuracy, surface finish, and hardness testing
  • Assembly — Bearing press-fit verification, torque confirmation, and rotational smoothness
  • Final inspection — 100% visual inspection plus statistical sampling for functional testing

Certification Portfolio

Beyond ISO 9001, we maintain certifications relevant to specific markets:

  • CE marking — For European market access, demonstrating compliance with Machinery Directive requirements
  • RoHS compliance — Ensuring restricted substance limits are met for electronics-adjacent applications
  • REACH registration — Full chemical substance registration for EU market access

Continuous Improvement

Our quality team conducts monthly Pareto analysis of defect data, identifying the vital few issues that drive the majority of quality costs. Recent improvement projects have reduced tread thickness variation by 42% and bearing press-fit defect rates by 67%.

Every employee participates in our suggestion program, submitting process improvement ideas. The best suggestions are implemented and the originators recognized — creating a culture where quality is everyone's responsibility.

Conclusion

Quality at HERDAR is not a checkbox — it is an operational philosophy embedded in every process, every inspection, and every shipment. Our certifications validate what our customers already know: wheels from HERDAR are engineered and manufactured to perform reliably in the world's most demanding industrial environments.