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Xintao Precision Co., Ltd. is committed to improving quality management continuously. We conduct manual sampling inspections, regular reviews, and equipment calibrations during production. Using collected data, we enhance processes to ensure stability. Before shipment, we provide comprehensive quality data via email, including inspection reports and material certificates.
Carefully inspect each purchase order.
All employees have received training on our written quality control procedures and policies. All data related to manufacturing will be documented for future reference, including orders, emails, and communications.
IQC (Incoming Quality Control)
All incoming raw materials for manufacturing will be inspected and detailed records will be kept.
IPQCS (In-Process Quality Control Section)
We conduct first-piece and in-process inspections during manufacturing to provide perfect parts and expedite your product to market.
FQC (Final Quality Control)
All finished parts are inspected according to quality standards, regardless of project size. Final quality inspection reports will be provided.
OQC (Outgoing Quality Control)
Our QC team will randomly inspect finished parts in the fully equipped inspection department before delivery to prevent the shipment of defective goods.
Defective Products
If any defective products are found, please notify us immediately. We will analyze the root cause and promptly rework or repair the parts. We will also take corrective actions to prevent non-conforming parts from occurring again.
Xintao Precision Co., Ltd. offers manufacturing services to help you achieve the strictest tolerances required for custom CNC machined parts. Our tolerance chart includes common tolerance features found in mechanical drawings.
If you're an experienced designer who is concerned about meeting tight tolerance requirements in your drawings, we can assist you in analyzing production feasibility, serving as an early-stage design reference. In other words, Xintao can support you throughout the manufacturing process, ensuring that your designs meet the required specifications
CNC Machining Tolerances | Linear dimension range（mm) | ||||||
Geometric Characteristics | Symbol | 0.5 – 6 | 6 – 30 | 30 – 120 | 120 – 400 | 400 – 1000 | 1000 – 2000 |
Length |  | ± 0.01 | ± 0.02 | ± 0.05 | ± 0.1 | ||
Diameter |  | 0.006 | 0.01 | 0.015 | 0.02 | / | / |
Angle |  | ± 0.03 | ± 0.05 | ± 0.15 | / | ||
Straightness |  | 0.003 | 0.005 | 0.01 | 0.02 | / | |
Flatness |  | 0.001 | 0.003 | 0.01 | 0.03 | 0.05 | 0.15 |
Circularity |  | 0.001 | 0.002 | 0.005 | 0.01 | / | / |
Cylindricity |  | 0.003 | 0.005 | 0.01 | 0.05 | / | / |
Profile of a line |  | 0.005 | 0.02 | 0.05 | 0.1 | 0.15 | 0.3 |
Profile of a surface |  | 0.01 | 0.02 | 0.05 | 0.1 | 0.15 | 0.3 |
Parallelism |  | 0.003 | 0.005 | 0.02 | 0.05 | 0.1 | / |
Perpendicularity |  | 0.003 | 0.005 | 0.01 | 0.05 | 0.1 | / |
Angularity |  | 0.003 | 0.05 | 0.1 | / | ||
Position |  | 0.01 | 0.02 | 0.05 | 0.1 | 0.2 | |
Concentricity |  | 0.003 | 0.005 | 0.01 | 0.05 | / | / |
Symmetry |  | 0.01 | 0.02 | 0.05 | 0.1 | / | |
Circular Runout |  | 0.002 | 0.005 | 0.01 | 0.05 | / | |
Total Runout |  | 0.003 | 0.005 | 0.01 | 0.05 | / | |
