ZH Precision Quality Assurance

At ZH Precision, quality is built into every stage of manufacturing. From material verification to final inspection, we combine advanced equipment, strict processes, and experienced engineers to ensure every part meets global standards.

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Quality Assurance Overview

At ZH Precision, quality is built into every step of the manufacturing process. Our certified quality management system, advanced inspection equipment, and strict validation procedures ensure every part meets the highest standards of accuracy, reliability, and consistency. From incoming materials to final shipment, we follow a fully traceable and controlled workflow—giving you dependable results for prototypes, low-volume production, and mass manufacturing.

Our Quality Control Steps

We rigorously control every step of production to ensure consistent quality, precise dimensions, and reliable performance. From engineering review to final inspection, each stage is carefully monitored and documented for full traceability and customer confidence.

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Material & Design Verification

Engineering review of 2D/3D drawings to validate geometry, materials, and manufacturability. Material certifications available upon request.

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First Article Inspection (FAI)

A first article is manufactured and fully inspected using calibrated precision tools to confirm tolerances, features, and surface requirements before mass production.

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In-Process Quality Control

Continuous inspections based on ISO 9001:2015 standards, with defined interval checks. All measurement tools are regularly calibrated to ensure consistent accuracy.

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Dimensional Verification

Precision equipment such as CMM, calipers, and gauges are used to verify key tolerances and geometric accuracy.

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Surface & Appearance Check

Each part is inspected for machining marks, burrs, cosmetic defects, and finish quality to ensure a clean final appearance.

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Final Inspection & Documentation

A comprehensive final inspection is conducted before packaging. Reports, COA, and RoHS documents are provided for full traceability.

ISO Quality Management System

ZH Precision operates under a fully certified ISO 9001:2015 and IATF 16949 quality management system. Every project follows strict process control—from material traceability and APQP planning to standardized inspection workflows—ensuring consistent, reliable, and production-grade quality.

Our Quality Objectives

On-time delivery rate ≥ 99%.
Customer complaint rate ≤ 2%.
Customer satisfaction ≥ 90%, with an annual increase of 0.5%.
Accuracy of process technical documents: 100%, with timely completion of new products at 100%.
Production qualification rate ≥ 97%, with an annual increase of 0.2%. The qualified rate of ex-factory products is 100%.

Test Reports We Can Provide

ZH Precision follows international manufacturing standards to ensure every custom part meets top-quality requirements. We provide certification and inspection reports across CNC machining, sheet metal, aluminum extrusion, and die casting, delivering reliable high-precision solutions.

📄Coordinate Measuring Machine (CMM) Inspection Report

Provides precise dimensional measurements using CMM equipment to verify that products meet design tolerances and specifications.

📄Material Certificate (Metals Only)

Confirms metal composition and quality, ensuring materials comply with standards and traceability requirements.

📄Standard Measurement Protocol

Ensures accuracy and consistency through calibrated tools and adherence to measurement procedures for CNC and die-cast parts.

📄First Article Inspection Report (FAIR)

Detailed inspection of the first production sample to verify compliance with design, dimensional, and contractual requirements before mass production.

📄RoHS Certificate

Verifies compliance with the EU RoHS Directive, ensuring products are free from hazardous substances and meet safety regulations.

📄REACH Compliance Certificate

Confirms compliance with the EU REACH Regulation for safe management of chemical substances and adherence to environmental standards.

📄Certificate of Conformance (CoC)

Certifies that the product meets all quality, safety, and drawing requirements, providing full traceability and assurance.

Our List of Testing Equipment

We ensure every product meets strict tolerance and quality standards. Our state-of-the-art testing equipment includes CMM, automatic image measuring instruments, gloss meters, colorimeters, film thickness monitors, micrometers, ring gauges, thread gauges, calipers, and altimeters.

Quantity	Equipment	Description / Purpose
1	3.0 m Coordinate Measuring Machine (CMM)	For precise 3D dimensional measurement.
1	2.5 m Coordinate Measuring Machine (CMM)	For medium-size parts dimensional inspection.
1	Digital Height Gauge	Accurate height and vertical dimension measurement.
1	Oxford Spectrometer (OES)	Optical emission spectrometer for metal composition analysis.
1	X-Ray Fluorescence (XRF) Analyzer for RoHS Compliance	Non-destructive elemental analysis to ensure RoHS standards.
1	Salt Spray Chamber	For corrosion resistance testing under controlled saline conditions.
1	Tensile Testing Machine / Universal Testing Machine (UTM)	Measures material tensile strength, elongation, and mechanical properties.
3	Colorimeters	For accurate color measurement and consistency verification.
3	Coating Thickness Gauges	Non-destructive measurement of paint or plating thickness.
4	Glossmeters	Measures surface gloss level for quality control of finishes.
10	Vernier Calipers	Precise linear measurement of internal, external, and depth dimensions.
6	Tooth Gauges	Gear and thread profile measurement.
6	R-Gauges	Measures radius or curvature of components.
6	Gauge Blocks (Slip Gauges)	High-precision length calibration and dimensional verification.
4	Pin Gauges	Inspect hole diameters and tolerances.
4	Smooth Ring Gauges	Inspect external diameters and fit accuracy.
10	Micrometers	Measure thickness or external dimensions with high precision.