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Product Description
The reliability of any heavy-duty hydraulic cylinder—whether in a steel mill, a mining excavator, or a forging press—depends on the quality of its piston rod. The rod's surface must be flawless to maintain hydraulic pressure and prevent leaks.
Yile Machinery manufactures custom hard chrome plated piston rods engineered to thrive in the most demanding industrial applications. Our multi-stage manufacturing process creates a rod that offers superior hardness, exceptional corrosion resistance, and an ultra-smooth surface for maximum hydraulic seal life.
A high-performance piston rod is not simply a piece of plated steel. It is an engineered system where each manufacturing step builds upon the last.
We begin with high-quality steel bar stock, such as 42CrMo, C45, or 60Mn, selected for its toughness. The material is then forged, creating a refined internal grain structure that provides far greater resistance to bending and fatigue than standard bar stock.
Before plating, the forged and heat-treated shaft is precision ground. This critical step:
Creates a flawless, mirror-like surface (Ra ≤ 0.2 μm) for perfect plating adhesion.
Guarantees exceptional straightness and concentricity (low Total Indicated Runout - TIR).
Ensures the final rod diameter is held to extremely tight tolerances, which is essential for seal performance.
This is not a decorative finish. We apply a thick, uniform layer of industrial hard chrome. This functional coating provides three key benefits:
Extreme Hardness (≈65-70 HRC): The surface becomes highly resistant to scratches, abrasion, and impact damage.
Low Coefficient of Friction: The ultra-smooth surface allows hydraulic seals to glide effortlessly, dramatically reducing wear and extending seal life.
Superior Corrosion Resistance: The chrome layer acts as a robust barrier, protecting the base steel from rust and chemical attack.
Parameter | Yile Machinery Specification |
Base Material | Alloy Steel (42CrMo), Carbon Steel (C45, 60Mn), Stainless Steel |
Manufacturing Process | Forging -> Quenching & Tempering (Q&T) -> Precision Grinding -> Hard Chrome Plating |
Chrome Hardness | 65-70 HRC (Rockwell Hardness) |
Plating Thickness | 20 - 100 µm (or as per customer specification) |
Surface Finish | Ra ≤ 0.2 μm (Mirror Finish) |
Straightness Tolerance | ≤ 0.1mm / meter |
Diameter Capacity | Up to 800 mm |
Length Capacity | Up to 15 meters |
Q1: What is the difference between a rod made from forged bar vs. standard bar stock?
A: Forging refines and aligns the steel's internal grain structure, making it significantly stronger and more resistant to fatigue failure. A piston rod made from forged material is less likely to bend or break under high side-loads or shock events, making it ideal for heavy-duty applications.
Q2: Can you repair my old, damaged piston rod?
A: Yes. We offer complete piston rod refurbishment services. This includes stripping the old chrome, repairing any scores or damage on the base metal, precision grinding back to a perfect surface, and applying a fresh layer of hard chrome plating. This is often a cost-effective alternative to manufacturing a new rod from scratch.
Q3: Why is surface finish (Ra) so important for a piston rod?
A: The surface finish (measured in Ra) dictates how the rod interacts with the hydraulic seals. A rough surface (high Ra value) will act like sandpaper, quickly destroying the seals and causing leaks. An ultra-smooth, mirror-like finish (low Ra value) allows the seal to glide with minimal friction, ensuring a long, leak-free service life.
Restore Your Hydraulic Power. Get a Quote for a Custom Piston Rod.
Send us your drawing, dimensions, or the model of the equipment it's for. We'll provide a fast quote for a new or refurbished rod built to exceed OEM standards.
