High-Precision Stainless Steel CNC Turned Parts Manufacturing
At Xierge Precision Machinery Co., Ltd., we specialize in manufacturing high-precision Stainless Steel CNC Turned Parts designed for critical applications such as automatic transmissions, hydraulic control valves, and fuel injection systems. Since our establishment in 1990, we have accumulated over 30 years of operational experience, perfecting the art of producing components that require absolute micro-precision. Automotive valve spools demand exceptionally tight tolerances and flawless surface finishes to prevent internal leakage and ensure rapid, accurate fluid or gas control within the vehicle.
Our state-of-the-art facility is equipped with Japanese imported Star CNC Swiss-type lathes, advanced machining centers, and high-precision grinders. This allows us to machine complex spool geometries, multiple annular grooves, and micro-cross holes while maintaining superior concentricity and cylindricity. To withstand the high-pressure and high-friction environment of automotive hydraulic systems, we strictly adopt premium raw materials, such as hardened stainless steel and alloy tool steel, tailored to your specific application.
Adhering to our core principle of "Integrity Oriented, Quality Foremost," we implement a rigorous quality control protocol. Our complete set of testing instruments, imported directly from Japan and Germany, enables us to conduct precise inspections for roundness, surface roughness, and dimensional stability. We continuously keep innovating to maintain sound business development. We warmly welcome domestic and overseas clients to visit our factory, explore our custom OEM/ODM capabilities, and build long-term cooperation opportunities.
Stainless Steel CNC Turned Parts Technical Specifications
| Spool Types | Hydraulic Control Valve Spools, Transmission Solenoid Spools, Pilot Valve Spools, Custom Designs |
|---|---|
| Primary Equipment | Star CNC Swiss-type Lathes, CNC Machining Centers, Precision Cylindrical Grinders |
| Diameter Tolerance | ±0.002mm to ±0.005mm (Depending on application requirements) |
| Geometric Tolerances | Cylindricity: 0.001mm; Roundness: 0.001mm; Coaxiality: 0.003mm |
| Common Materials | SUS440C, SUS303, SUS304, 9Cr18Mo, 42CrMo, Carbon Alloy Steel |
| Hardness & Heat Treatment | Vacuum Heat Treatment, Quenching & Tempering; Hardness up to HRC 55-62 |
| Surface Roughness (Ra) | Ground Journals/Spool Lands: Ra 0.2 - Ra 0.4; Turned Surfaces: Ra 0.8 |
| Surface Treatments | Nitriding, Hard Chrome Plating, Black Oxide, QPQ (Salt Bath Nitrocarburizing) |
| Inspection Instruments | Japanese/German CMM, Roundness Testers, Surface Roughness Testers, Optical Comparators |
Core Advantages of Xierge Automotive Valve Spools
- Swiss-Type Micro-Precision: Our Japanese Star CNC Swiss-type lathes provide unparalleled support for slender valve spools, preventing deflection and ensuring ultra-tight cylindricity and concentricity.
- Advanced Grinding Capabilities: Equipped with high-precision cylindrical grinders, we achieve flawless spool land geometries and Ra 0.2 surface finishes, which are critical for preventing internal hydraulic leakage.
- Automotive-Grade Material Mastery: We strictly select premium hardened stainless steel (like SUS440C and 9Cr18Mo) that withstands high-pressure automotive environments and resists corrosive transmission fluids.
- Specialized Heat Treatment: Through controlled vacuum heat treatment and nitriding, we achieve a tough core with an ultra-hard, wear-resistant surface (HRC 55-62), extending the spool's operational lifespan.
- Burr-Free Complex Machining: Our multi-axis machining centers and dedicated cleaning machines ensure that micro-cross holes and multiple annular grooves are completely free of burrs and contaminants.
- World-Class Quality Assurance: Utilizing a complete set of Japanese and German imported testing instruments, we conduct 100% inspection on roundness, dimensional accuracy, and surface integrity.
- 30+ Years of OEM/ODM Expertise: Since 1990, we have continuously innovated, allowing us to seamlessly transition custom client designs from prototyping to high-volume mass production.
Payment Methods & Global Logistics Solutions
Secure International Payment Terms:
To facilitate smooth B2B international trade, we offer flexible and secure payment options. For mass production orders of automotive valve spools, we accept T/T (Telegraphic Transfer) with a standard 30% advance deposit and 70% balance before shipment. For large-scale supply contracts, we are fully equipped to process Irrevocable Letters of Credit (L/C) at sight. For initial prototyping or tooling fees, PayPal and Western Union are available for your convenience.
Global Logistics & Protective Packaging:
We offer comprehensive shipping solutions under FOB, CIF, and DAP Incoterms. For urgent prototype development, we utilize expedited international couriers such as DHL, FedEx, and UPS. For bulk production, we provide cost-effective sea freight (LCL/FCL) and air freight through our trusted global forwarder network. Because automotive valve spools are ultra-precision components highly sensitive to moisture and impact, we utilize VCI (Volatile Corrosion Inhibitor) anti-rust paper, vacuum-sealed plastic packaging, and custom EPE foam inserts. All parcels are secured in sturdy export-grade wooden cases or pallets to ensure they arrive in pristine, ready-to-assemble condition.
FAQ
Cylindricity is critical to prevent internal fluid bypass. We achieve this by using our Japanese Star CNC Swiss-type lathes to minimize bar stock deflection, followed by precision cylindrical grinding. For verification, we use imported German and Japanese roundness testers and high-precision micrometers to map the spool lands, ensuring cylindricity tolerances are held within 0.001mm.
For transmission valve spools, we highly recommend Vacuum Heat Treatment followed by QPQ (Salt Bath Nitrocarburizing) or Nitriding. These processes provide a highly wear-resistant and corrosion-resistant surface layer (achieving HRC 60+) while maintaining a tough core, which is essential for components constantly exposed to pressurized, heated transmission fluids.
Burrs can break off and destroy a hydraulic system. We employ specialized deburring techniques, including thermal energy deburring (TEM) or precision manual razor scraping under microscopes. Following this, every spool undergoes a rigorous ultrasonic cleaning cycle in our specialized cleaning machines to flush out any microscopic debris from internal channels.
Yes, SUS440C is a standard material we process for high-hardness automotive applications. After CNC machining the blank on our Swiss-type lathes, we perform vacuum hardening to achieve a uniform hardness of HRC 58-62. We then conduct precision grinding to bring the spool lands back to the required micro-tolerances, as heat treatment can cause slight dimensional changes.
We specialize in custom OEM and ODM manufacturing. Utilizing live-tooling on our CNC Swiss lathes and 4-axis machining centers, we can produce highly complex, non-standard groove profiles, angled lands, and custom cross-drilled holes directly from the client's 2D engineering drawings or 3D CAD models.
We utilize Statistical Process Control (SPC) throughout the production cycle. By regularly calibrating our Japanese and German imported testing instruments and performing first article inspections (FAI) alongside in-process random sampling, we ensure that the 10,000th valve spool matches the exact precision and material properties of the first approved prototype.
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