Bos Hydraulic specializes in the manufacturing of SAE J524 precision tubing, cold-drawn to exacting standards for superior performance in hydraulic and pneumatic applications. Our tubing undergoes normalization in a controlled atmosphere, utilizing E235 fine-grain steel to ensure exceptional cold deformation characteristics and reliable long-term operation.
Specifications of J524 Seamless Hydraulic Tubing
| Parameter | Specification | Standard |
| Material | ST37.4, Stainless Steel | EN10305-4,SAE J524, DIN 2391,ASTM A519 |
| OD Range | 6–42 mm | Tolerance: ±0.1mm |
| Wall Thickness | 0.8–8 mm | Tolerance: ±0.05mm |
| Working Pressure | 30–50 MPa | Burst Pressure: |
| ≥120 MPa | ||
| Temperature Range | -40°C to +120°C | Pressure |
| derating >150°C | ||
| Surface Finish | Phosphated (NBK) + Oiled | Ra ≤0.4μm |
| Length | 5–12 m (Customizable) | Ends: Beveled/Capped |
Advanced Manufacturing Process
Cold Drawing Technology
Billets are precision-perforated and cold-drawn to create seamless hollow sections while maintaining H8-H9 dimensional accuracy
Surface Finishing
Internal surfaces undergo precision honing to achieve Ra 0.2-0.4μm surface roughness, significantly reducing fluid turbulence and minimizing seal wear
Heat Treatment Protocol
Advanced stress-relieving (+SR) or annealing (+A) processes stabilize the material microstructure, ensuring consistent tensile strength ≥52 kg/cm²
Quality Assurance
Comprehensive validation through eddy current defect detection, hydrostatic burst testing at 4× working pressure, and spectrometer material composition verification
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