Quality & Certifications
Your Assurance of Precision. From incoming materials to final delivery — ISO 9001 & GJB 9001C certified quality control ensures every part meets your exact specifications and tolerance requirements.
Quality Philosophy
At YuJiaxin Tech, quality is not just a department — it is the foundation of everything we do. We have built a comprehensive quality management system that integrates with our manufacturing processes, ensuring that every part we produce meets or exceeds customer expectations.
Our quality philosophy centers on prevention over detection. By implementing strict process controls, statistical monitoring, and continuous improvement cycles, we minimize defects before they occur — not after.
Certifications & Compliance
ISO 9001
Quality Management System
Internationally recognized standard for quality management systems, ensuring consistent delivery of products and services that meet customer and regulatory requirements.GJB 9001C-2017
Chinese Military Quality Management
National defense quality management system standard of China, equivalent to AS9100 in the aerospace sector. Demonstrates our capability to meet stringent military and high-reliability manufacturing requirements.RoHS Compliant
Environmental Compliance
Restriction of Hazardous Substances directive. All our processes and materials comply with EU environmental standards, ensuring safe and eco-friendly metal parts for electronics and electrical equipment applications.Inspection & Testing Capabilities
Optical Profile Projector
What it means for you: Every complex profile, gear tooth, and thread form is measured with micron-level precision — ensuring your parts fit perfectly in your assembly line.
Non-contact measurement for gear, intricate parts, and soft materials.2D Measuring Projector
What it means for you: Flat parts and stamped components are checked against your exact tolerances — zero surprises when parts reach your production floor.
High-precision 2D measurement with edge detection and digital readout.Hardness Tester
What it means for you: Material hardness is verified to ensure your parts can withstand the intended mechanical stress — preventing field failures in demanding applications.
Rockwell, Vickers, and Brinell scales for all metal alloys.Tensile Testing Machine
What it means for you: Every batch is pull-tested to confirm mechanical properties — guaranteeing structural integrity and performance in your end product.
Tensile strength, yield strength, and elongation validation.Tool Microscope
What it means for you: Surface defects and microstructure are magnified for thorough inspection — ensuring the quality your brand reputation depends on.
High-magnification surface defect inspection.Density Meter
What it means for you: Material composition is verified to confirm you get exactly what you specified — no compromises on raw material quality.
Archimedes principle for metal, ceramic, and sintered parts.Precision Balance
What it means for you: Lot-based weight verification ensures consistency from the first part to the last — supporting inventory accuracy and cost control.
High-accuracy weighing for components and raw materials.Salt Spray Test Chamber
What it means for you: Corrosion resistance is validated for your surface treatments — ensuring parts perform reliably in harsh environments.
Standard protocols for plating, coating, and passivation quality.Precision & Tolerance Capabilities
| Process | Standard Tolerance | Precision Tolerance | Min. Wall Thickness |
|---|---|---|---|
| MIM | ±0.3% | ±0.1% | 0.3 mm |
| CIM (Ceramics Powder Injection Molding) | ±0.5% | ±0.2% | 0.3 mm |
| CNC Machining | ±0.01 mm | ±0.002 mm | 0.5 mm |
| Precision Casting | ±0.5% | ±0.2% | 0.5 mm |
| Powder Metallurgy | ±0.2% | ±0.05% | 0.8 mm |
| Gear Hobbing | DIN 6 (ISO 1328) | DIN 4 (ISO 1328) | — |
* Precision tolerances available upon request. Standard tolerances are typical for production runs. Custom tolerance requirements can be discussed during the quoting phase.
Quality Control Process
1. Incoming Inspection
- Raw material certificate verification
- Dimensional sampling with optical projectors
- Lot traceability documentation
- Visual and hardness sampling checks
2. In-Process Control
- First article inspection (FAI)
- Statistical Process Control (SPC)
- Tooling and fixture verification
- Operator self-check procedures
3. Pre-Shipment Inspection
- Dimensional verification using optical profile projector
- Visual inspection under tool microscope
- Functional/assembly test (as applicable)
- Packaging integrity check
4. Documentation & Traceability
- Inspection reports (PPAP, Dimensional Report)
- Material certificates (EN 10204 3.1)
- Lot/batch traceability records
- Non-conformance reports (NCR) handling
Quality Performance Metrics
Need a Quality-Focused Manufacturing Partner?
Share your tolerances, specifications, and quality requirements. Our engineering team will provide a detailed quality plan with your quote.
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