Quality Policy - SYM Precision Machining Manufacturer China

Quality Control

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Quality control for high precision machining services, excellence in every step

For nearly 25 years, SYM Precision Machining has been at the forefront of high-precision machining services. Over the years, we have continuously improved and refined our processes to meet the ever-evolving needs of our customers. By establishing a comprehensive in-house quality management system, we ensure that every part we deliver meets the highest standards of precision and reliability.

At SYM Precision Machining, quality control is at the heart of our operations. Our robust quality management system ensures that every part we manufacture meets or exceeds customer expectations. Certified to multiple international standards, we maintain strict processes, from raw material inspection to final delivery, ensuring consistent excellence.

Quality Certifications

Our quality system conforms to and is certified to:

Quality Control Process

Our quality assurance system is implemented at every stage of production

Incoming Quality Control (IQC)

Inspect all raw materials to ensure they meet required specifications.

In-Process Quality Control (IPQC)

Monitor production processes to identify and resolve issues in real time.

First Article Inspection (FAI)

Verify the accuracy and quality of the first production part to set the standard for the batch.

Quality Assurance (QA)

4.Conduct final inspections before shipment to ensure all products meet customer requirements.

Experienced Quality Team

Our quality assurance system is implemented at every stage of production

Incoming Material Inspection: Verifies raw materials comply with specifications.
Process Inspection: Monitors production quality at every step
Final Delivery Inspection: Ensures all finished products meet standards before shipping
Quality Engineers: Develop and maintain quality systems, analyze data, and implement improvements

Advanced Measuring Equipment

To guarantee precise and accurate results, SYM utilizes cutting-edge measuring tools, including

Coordinate Measuring Machine (CMM): For detailed 3D measurements.
Height Gage: Accurate vertical measurements
2D Vision Measuring Machine: Non-contact measurements for complex geometries
Profile Projector: Visual inspection of intricate profiles
Stationary Metal Analyzer: Ensures material composition accuracy
Hardness Tester: Measures material hardness for durability verification
Coating Thickness Gauge: Ensures even plating or coating thickness
Surface Roughness Gauge: Verifies surface finishes
Concentricity Gauge: Measures alignment precision of circular features
Pin Gauge and Steel Gauge Blocks: For holes diameter and precise slot dimensional checks
Calipers and Digital Micrometers: General-purpose precision measurements

M/C Type	Qty’	Brand	Made in	Model	Measuring Range (mm)	Accuracy (mm)
CMM	1	ZEISS	GERMANY	SPECTRUM 10/12/6	800 X 1200 X 900	1.7+L/350um
CMM	1	TESA	SWITZERLAND	Micro-Hite 3D	460 X 510 X 420	0.003
Height Gage	6	TESA	SWITZERLAND	Hite 700/400/350	0-700	0.002
2.5D Auto Vision Measuring Machine	1	GDH	CHINA	3020CNC	300 X 200 X 200	0.003
2D Vision Measuring Machine	8	EASSON	CHINA	VMS-1510G	150X 110 X 100	0.01
Profile Projector	2	RATIONAL	CHINA	CPJ-3050	150 X 50 X 100	0.005
Digital Micrometer	24	QLR	CHINA		0-75	0.004
Digital Three Point Internal Micrometer	2	MITUTOYO	JAPAN	SBM-63CX/88CX	55~63/75~88	±0.006
Three Point Internal Micrometer	24	QLR	CHINA	6-100mm	6-100	±0.005
Tungesten Steel Gauge Block	1	AVIC	CHINA	0.5-100mm	0.50-100	0.002
Concentricity Gauge	1	UNIVERSAL	AMERICA	23211-B-10P	Φ3~ Φ25 X 102 mm	0.002
Measuring Microscope	3	MITUTOYO	JAPAN	TM505	50 X 50 X 115	30X
Surface Roughness Gauge	2	MITUTOYO	JAPAN	SJ-201	-200~+150 mm	–
Stationary Metal Analyzer	1	AMETEK	GERMANY	SPECTROMAXx	–	–
X-ray Coating Thickness Gauge	1	MicroPioneer	KOREA	XRF-2000	0-30 (H)	0.01 um
Vickers Hardness Tester	1	SCTMC	CHINA	HV-1000	1-2967 HV	0.01
Rockwell Hardness Tester	2	ROCKIE	CHINA	HR-150A	20-88HRA \| 20-100HRB 20-70 HRC	0.5HR

SYM Precision Machining Inspection Guide

At SYM Precision Machining, our rigorous inspection processes ensure every part meets the highest standards of quality and reliability. Here’s an overview of our inspection guide, tailored to meet customer and industry requirements.

1. 100% Appearance Inspection

All parts undergo 100% visual inspectionto detect surface defects such as: scratches, burrs, dents, finish imperfections.
Ensures the aesthetic quality of every part meets customer expectations.

2. Dimensional Inspection

For Sample Size Production: Full Inspection, all dimensions of each part are inspected to verify compliance with design specifications.
For Mass Production: Sampling Inspection, Conducted based on the AQL MIL-STD-105E sampling standard. Except for the special requirements of customers, we inspect the machined parts according to typically 0.25 to 0.4 for critical dimensions. Sampling size and criteria determined according to lot size and inspection level.

3. Key Characters Inspection

Threads: Inspection for pitch, angle, and fit using thread gauges.
Precision Shaft and Hole Sizes: Checked using micrometers, PINgauges, and CMMs for tight tolerances.
Shape and Position Tolerance:Flatness, perpendicularity, concentricity, and other geometric tolerances measured using profile projectors, CMMs, or special gauges.

Documentation and Compliance

To ensure transparency and traceability, each shipment includes:

Raw Material Certifications

Proof of material composition and quality.

Certificate of Conformance (COC)

Confirms compliance with customer specifications.

Plating and Finish Documents

Details about surface treatments.

Dimensional Inspection Documents (QA Reports)

Records of inspected dimensions.

RoHS & REACH Compliance

Environmental and safety certifications

Key Highlights of SYM's Quality Management System

To ensure transparency and traceability, each shipment includes:

Continuous Improvement

We regularly review and enhance our processes to ensure we stay ahead in precision machining technology.

Certified Quality Standards

Our quality management system is certified to ISO 9001, IATF 16949, ISO 13485, AS9100D, and other international standards, demonstrating our commitment to excellence across industries.

Comprehensive Inspections

From raw materials to final product delivery, every step undergoes rigorous inspection to guarantee flawless results.

State-of-the-Art Equipment

We use advanced CNC machines and precision measuring tools to achieve unparalleled accuracy and consistency.

Get Your Parts Into Production Today!

SYM Precision Machining is your trusted partner for high-quality, high precision machining solutions. With a strong focus on quality control, advanced inspection capabilities, and adherence to strict certifications, we ensure your parts meet the most demanding requirements. Let us help you bring your projects to life with precision and excellence.