Explore SAE J524 Tubing For hydraulic Lines

SAE J524 seamless tubing is a high-quality steel tube standard widely used in hydraulic lines for automotive and industrial systems. This standard sets strict requirements for tube dimensions, wall thickness, material quality, and mechanical properties to ensure reliable performance under high pressure. Seamless construction eliminates weak points, providing superior strength and excellent corrosion resistance.

In hydraulic lines, these tubes act as the system’s pathways, transporting hydraulic fluid between pumps, valves, and actuators. They handle high-pressure flow, prevent leaks, and maintain system efficiency. Common applications include automotive braking systems, construction machinery hydraulics, agricultural equipment, and industrial hydraulic machines.

Our hydraulic steel tubes are made from carbon steel (ST37.4) or stainless steel. They deliver burst pressure at least four times the working pressure (up to 50 MPa) and feature a smooth internal surface (Ra ≤0.4 μm) to reduce friction and extend seal life.

Choosing MULTISTEEL‘s SAE J524 hydraulic tubing ensures safety, durability, and compliance with industry standards. Its consistent quality and reliability make it an ideal choice for engineers and technicians designing or maintaining hydraulic systems that require precise, high-pressure fluid handling.

Specifications of J524 Seamless Hydraulic Tubing

Applications of Hydraulic Steel Tubing

• Construction Machinery: Hydraulic tubes for excavators/cranes (high-pressure hydraulic lines).

• Agricultural Equipment: Tractor steering/lifting systems (resists vibration fatigue).

• Industrial Automation: Injection molding machines, press brakes (precision fluid control).

• Marine & Offshore: Hydraulic winches/pumps (saltwater corrosion resistance).

Manufacturing Process

1. Cold Drawing
   Billets are perforated and cold-drawn to achieve seamless hollow sections with H8-H9 dimensional accuracy.
   2. Precision Honing
   Internal surfaces are honed to Ra 0.2–0.4μm, reducing fluid turbulence and seal wear.
   3. Heat Treatment
   Stress-relieving (+SR) or annealing (+A) stabilizes microstructure, ensuring tensile strength ≥52 kg/cm².
   4. Quality Validation

   
   

• Eddy current testing for defects

• Hydrostatic burst testing (4× working pressure)

• Spectrometer material verification.

FAQs

Q: Can you supply dual-standard (SAE J524 + DIN 2391) pipes?
A: Yes! All pipes undergo dual-standard testing.
Q: Do you support custom OD/wall thickness outside standard range?
A: Custom sizes (e.g., OD 40mm) available at MOQ 1,000 meters.
Q: What is the hose/tube fitting compatibility?
A: Compatible with SAE J356/J526 flared fittings and DIN 2353/EN 10305 compression fittings.