HYDRAULIC CYLINDER PISTON ROD STANDARDS FROM VIET NAM

The piston rod is a crucial component that transmits force from the piston to the external mechanism. It must meet technical standards to ensure durability, wear resistance, and high-pressure tolerance.


1. Important International Standards

StandardFeaturesNotes
ISO 6020/2Standard piston rod for 160 barUsed for compact cylinders
ISO 6022Piston rod for 250 bar pressureDesigned for heavy-duty applications
ISO 10100Hydraulic cylinder testing requirementsEnsures quality and durability
DIN 2391Precision hydraulic tubesApplied to high-precision cylinders
EN 10305-1Cold-drawn seamless steel tubesUsed for cylinder barrels and piston rods
JIS G3445Japanese steel tube standardCommon in the Asian market

2. Hydraulic Cylinder Piston Rod Materials

🔹 C45 Alloy Steel (AISI 1045, CK45):

  • Good hardness, easy to machine.
  • Often chrome-plated for durability.

🔹 42CrMo4 Alloy Steel (AISI 4140):

  • Higher load capacity, better bending resistance than C45.
  • Used for high-pressure cylinders.

🔹 Stainless Steel (SUS304, SUS316):

  • Excellent corrosion resistance, suitable for chemical and marine environments.

Hydraulic cylinder piston rod in Viet Nam factory


3. Piston Rod Surface Treatments

🔹 Hard Chrome Plating:

  • Increases hardness (50 – 60 HRC).
  • Chrome layer thickness: 20 – 100 µm.
  • Reduces friction and wear.

🔹 Nickel Plating:

  • Excellent corrosion resistance, suitable for humid environments.
  • Common in food and medical industries.

🔹 Induction Hardening:

  • Surface hardness up to 55 – 60 HRC.
  • Enhances load capacity, minimizes bending.

4. Dimensional & Accuracy Requirements

SpecificationStandard
RoundnessIT7 or higher
Surface RoughnessRa ≤ 0.2 µm
Diameter Tolerancef7, h7
Straightness≤ 0.3 mm per 1000 mm

5. Applications of Hydraulic Cylinder Piston Rods

Hydraulic presses, stamping machines
Lifting systems, cranes, elevators
Industrial machinery, construction vehicles
Marine and food industry cylinders

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