Quality Assurance at ZH Precision
At ZH Precision, quality is built into every stage of the manufacturing process. From material inspection and machining control to final dimensional verification, our quality assurance system ensures consistent and reliable parts that meet customer specifications.
Quality Certifications
ISO 9001:2015 | IATF 16949:2016
Our Quality Team
At ZH Precision, our Quality Control Department consists of experienced QA specialists, Quality Engineers (QE), and inspection technicians who manage quality assurance throughout the manufacturing process. Our team maintains quality documentation, inspection records, and verification procedures to ensure traceability and compliance with customer requirements.
From reviewing drawings and specifications to providing inspection reports, Material Certificates, and First Article Inspection (FAI) reports, our quality professionals support quality verification, customer audits, and consistent production quality.
Our Quality Control Process
Quality is built into every stage of our manufacturing process. From engineering review and incoming material inspection to in-process control and final inspection, ZH Precision applies systematic quality procedures to ensure every part meets drawing requirements, dimensional tolerances, and customer specifications.
Engineering & Quality Review
Engineering and quality teams review drawings, specifications, GD&T, tolerances, and inspection requirements before manufacturing begins.
Incoming Material Inspection (IQC)
Incoming materials are checked against specifications and material certificates to verify compliance and support material traceability.
First Article Inspection (FAI)
First article parts are inspected against drawing dimensions, GD&T requirements, and specified inspection criteria before production approval.
In-Process Quality Control (IPQC)
Critical dimensions and process conditions are checked during manufacturing to detect deviations early and maintain process stability.
Final Inspection & Documentation
Finished parts undergo dimensional and visual inspection before shipment. Inspection reports, material certificates, FAI reports, and other required quality records can be provided for verification and traceability.
ISO Quality Management System
ZH Precision operates under ISO 9001:2015 and IATF 16949 certified quality management systems, applying strict process controls throughout manufacturing, including raw material traceability, production planning, and standardized inspection procedures. For automotive projects, APQP practices are implemented to support effective quality planning and process validation. This quality framework ensures stable, repeatable production performance for custom metal components and high-volume manufacturing.
Test Reports We Can Provide
ZH Precision provides CMM inspection reports, FAI reports, material certificates, composition analysis, hardness and surface finish records, RoHS/REACH certificates, and batch traceability documents. Reports are available based on project requirements to support inspection, audits, and quality verification.
Detailed CMM measurement results for critical dimensions, GD&T features, and specified drawing requirements.
Records measured dimensions and inspection results against drawing tolerances and specified requirements.
Documents first article inspection results against drawing dimensions, GD&T, and specified requirements before production approval.
Provides material grade, specification, and traceability information, with chemical or mechanical test data where applicable.
Provides calibration records for applicable inspection equipment to support measurement accuracy and traceability.
Confirms that supplied parts conform to the applicable drawings, specifications, and agreed customer requirements.
Supporting compliance documentation can be provided for applicable materials and finishes based on project requirements.
Documentation Availability: Inspection reports, material certificates, FAI records, CoC, and compliance documentation can be provided according to drawing requirements, customer specifications, and project needs.
Our Inspection Equipment
Advanced inspection equipment, including CMM, material analysis instruments, and precision measuring tools, is used to verify part dimensions, material properties, and surface quality. These capabilities support reliable quality control for CNC machining, die casting, and custom metal components.
| Qty. | Inspection Equipment | Application |
|---|---|---|
| 1 | 3.0 m Bridge Coordinate Measuring Machine (CMM) | 3D dimensional inspection of large or complex components, including critical dimensions, positions, profiles, and GD&T features. |
| 1 | 2.5 m Bridge Coordinate Measuring Machine (CMM) | Dimensional verification of medium-size components, critical features, geometric relationships, and drawing requirements. |
| 1 | Digital Height Gauge | Measurement of heights, steps, depths, and vertical feature relationships on machined components. |
| 1 | Optical Emission Spectrometer (OES) | Chemical composition analysis for metal alloy identification, grade verification, and incoming material control. |
| 1 | XRF Analyzer | Non-destructive elemental analysis for material identification and RoHS screening. |
| 1 | Salt Spray Chamber | Accelerated corrosion testing of coatings and finished components under controlled salt spray conditions. |
| 1 | Universal Testing Machine (UTM) | Mechanical testing of prepared specimens for tensile strength, yield strength, elongation, and related properties. |
| 1 | Surface Roughness Tester | Measures surface roughness parameters such as Ra to verify specified surface finish requirements. |
| 1 | Optical Comparator / Vision Measuring System | Non-contact inspection of profiles, contours, small features, angles, and dimensional relationships. |
| 3+ | Colorimeters | Measures color values and helps verify color consistency across coated or finished parts. |
| 3+ | Coating Thickness Gauges | Non-destructive measurement of coating, paint, and plating thickness where applicable. |
| 4+ | Glossmeters | Measures surface gloss to verify consistency of painted, coated, and decorative finishes. |
| 10+ | Vernier Calipers | General dimensional inspection of external, internal, step, and depth features. |
| 6+ | Thread Plug & Ring Gauges | Go/no-go inspection of internal and external threads against specified thread requirements. |
| 6+ | Radius Gauges | Quick verification of internal and external radii against standard gauge sizes. |
| 6+ | Gauge Blocks (Slip Gauges) | Reference standards used for checking, setting, and verifying dimensional measuring equipment. |
| 4+ | Pin Gauges | Go/no-go or comparative inspection of hole diameters and internal dimensional features. |
| 4+ | Plain Ring Gauges | Go/no-go verification of external diameters, shafts, and other cylindrical features. |
| 10+ | Micrometers | Precision measurement of external dimensions, diameters, thicknesses, and other critical features. |