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
| Standard | Features | Notes |
|---|---|---|
| ISO 6020/2 | Standard piston rod for 160 bar | Used for compact cylinders |
| ISO 6022 | Piston rod for 250 bar pressure | Designed for heavy-duty applications |
| ISO 10100 | Hydraulic cylinder testing requirements | Ensures quality and durability |
| DIN 2391 | Precision hydraulic tubes | Applied to high-precision cylinders |
| EN 10305-1 | Cold-drawn seamless steel tubes | Used for cylinder barrels and piston rods |
| JIS G3445 | Japanese steel tube standard | Common 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.
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
| Specification | Standard |
|---|---|
| Roundness | IT7 or higher |
| Surface Roughness | Ra ≤ 0.2 µm |
| Diameter Tolerance | f7, 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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