Products
We produce high-strength, precision seamless tubes for core motor components. Utilizing premium steel and advanced cold-forming processes, our tubes guarantee exceptional dimensional accuracy (OD/ID/WT), superior straightness, and excellent surfaces finish. With optimized mechanical properties - including high strength, good toughness and uniform metallurgical structure - they deliver stable rotation and reliable power transmission in demanding applications. Compliant with automotive standards, JINAO tubes are the proven foundation for high-performance, lightweight motor systems requiring durability and efficiency.
Standard
Manufactured to international standards including EN, DIN, ASTM, ASME, JIS and GB for worldwide compliance.
Specifications
We currently offer precision seamless steel tubes in the following standard dimensions (OD × WT × L):
46×10.25×214mm | 51×15.65×157.6mm | 51.3×5.95×150mm | 54×9.5×415mm | 63.2×6.65×-* | 65×14.5×165mm | 68.7×10.25×-* | 73.8×15.75×221.5mm | 78×17×160mm | 83×11.5×-* | 95×14.5×325mm | 101.5×13.25×102.4mm
Standard size coverage: Outer Diameter (OD) 12-100mm; Wall Thickness (WT) 0.7-20mm
Materials include but are not limited to: 16MnCr5 | 20MnCr5 | 20MnCr5H | 20CrMnTiH | 42CrMo | 42CrMo4 | 34MnB5 | S38 | SCM420H etc. carbon or alloy steel.
Key Characteristics
High Precision
Advanced cold drawing/rolling process to ensure tight tolerances (OD/ID/WT) and superior straightness for EV.
High Strength
High precision & strength characteristics, especially the alloy steel material, but also to enhance the strength to a new level.
Lightweight & Material Uniformity
The lightweight design effectively reduces the EV weight and improves energy efficiency, while exceptional dimensional uniformity ensures stable powertrain performance.
Premium Materials
Utilizing performance carbon steels, alloy grades, or custom-engineered materials per customer specifications, our tubes maintain exceptional durability and structural stability in complicated EV operating environments.
Advanced Manufacturing Process
We combine advanced hot rolling and cold drawing/cold rolling processes to manufacture every seamless steel tube with precision and care. During hot rolling, solid billets are pierced at high temperatures and pressure to form the initial seamless structure. This is followed by cold drawing and cold rolling at room temperature, which further enhances dimensional accuracy and surface quality. The unique combination of techniques makes our tubes feature smooth inner and outer surfaces, free from cracks, pits, or blemishes - ensuring performance that reaches the advanced level of industry.
Customization Service
We offer customization for different specifications and various shaped tubes to meet your application needs. Specifications: Outer Diameter: 12-100mm; Wall Thickness: 0.7-20mm
Why Choose
Why Choose JINAO
We strictly follow IATF 16949, VDA 6.3, and the Toyota Lean Production System to enhance our production and process control - ensuring consistent, high-quality products for our customers.
Full-Process Seamless Tube Manufacturing
Integrated capability from Raw to Finished.
Short Development Cycles
Rapid response to customer needs and reduced time-to-market.
Consistent Quality
Strict quality control ensures product reliability.
