Hydraulic Cylinder Piston Rods

Name: Chrome Hydraulic Piston Rods for Industrial Cylinders – Frigate
Price: 249.00 USD
Availability: InStock

Hydraulic Cylinder Piston Rod experiences alternating tensile and compressive forces during operation in mobile hydraulics and servo-actuated systems. To ensure durability under cyclic loading, each Hydraulic Cylinder Piston Rod is manufactured from quenched and tempered high-strength alloy steels such as 42CrMo4 or C45, offering yield strengths above 800 MPa. Finite Element Analysis is applied to validate rod cross-section geometry and identify high-stress zones, while straightness tolerances within 0.1 mm/m are maintained to reduce column buckling under eccentric loads. These measures collectively improve service life in fatigue-critical applications.

Material

Hardened & Ground Steel (AISI 1045, 4140, or 4340), Stainless Steel 17-4PH or 316L

Dimensional Tolerances

h9 (ISO 286), h7 (for high-pressure applications)

Length Tolerance

Per Meter – ±0.5 mm; Overall – ±1.0 mm (adjustable for custom lengths)

Surface Finish

Seal Contact Area – Ra ≤0.1–0.2 µm (superfinished & polished); Non-Contact – Ra ≤0.4 µm

Hardness/Case Depth

Case-Hardened – 55–60 HRC (0.5–1.5 mm depth); Through-Hardened – 30–40 HRC (for stainless steel)

Product Description

Hydraulic Cylinder Piston Rod failure often originates at the seal interface due to surface-induced micro-galling or excessive friction. To address this, each Hydraulic Cylinder Piston Rod is processed through centerless grinding and precision polishing to achieve surface roughness values below Ra 0.2 µm. Multi-layer hard chromium plating with thickness up to 30 microns provides a uniform hardness shell to resist abrasive contact and fretting. Hydrogen embrittlement is mitigated through controlled baking processes, and residual waviness is eliminated to ensure full compatibility with dynamic seal profiles used in reciprocating motion systems.

Straightness

Per Meter – ≤0.1 mm; Overall – ≤0.3 mm (adjustable for long rods)

End Features

Threads – Metric/UN (Gr. 2A/3A); Bore/Eyelet – ±0.02 mm position tolerance

Chrome Plating

Thickness – 20–50 µm (hard chrome); Hardness – 800–1000 HV; Porosity Tested – ASTM B117 compliant

Concentricity

End Features to Rod – ≤0.03 mm TIR; Plating Runout – ≤0.02 mm

Certification Standards

ISO 3320, DIN 2391, ASTM B633, RoHS/REACH Compliant

Technical Advantages

Hydraulic Cylinder Piston Rod used in exposed conditions is highly susceptible to pitting corrosion, which compromises sealing and weakens rod structure. Corrosion resistance is enhanced through electroplated chrome coatings tested to ASTM B117 with salt spray resistance beyond 120 hours. For aggressive or chemically active environments, each Hydraulic Cylinder Piston Rod may be coated with HVOF ceramic layers or electroless nickel plating to prevent localized attack. Low-sulfur base material and post-coating passivation further improve long-term exposure performance, especially in coastal, fertilizer, and wastewater treatment systems.

Hydraulic Cylinder Piston Rod requires strict dimensional tolerances to ensure axial symmetry and consistent seal loading during operation. Precision CNC machining delivers diameter tolerances to ISO h6 or g6 classes, while run-out is held below 0.02 mm over full rod length. Each Hydraulic Cylinder Piston Rod undergoes roundness, straightness, and taper validation using laser or contact metrology to prevent seal extrusion and leakage due to misalignment. Complex features such as UNF or metric threads, pin bores, and clevis grooves are executed with micron-level repeatability to match cylinder gland and mounting requirements.

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Industry Applications

Mobile Earthmoving Equipment

Hydraulic Cylinder Piston Rod transmits axial force in high-load excavator booms, resisting impact fatigue and side loading under dynamic conditions.

Injection Molding Machines

Provides precise linear motion control in clamping cylinders, with low surface roughness critical for maintaining seal performance under thermal cycling.

Mining Hydraulic Roof Supports

Handles high-pressure reciprocation in confined underground spaces, with corrosion-resistant coatings to prevent pitting from water and chemical exposure.

Marine Steering Cylinders

Operates in corrosive saltwater environments, requiring thick chrome plating and tight concentricity for smooth motion and long seal life.

Steel Mill Actuation Systems

Withstands elevated temperatures and scale buildup during billet positioning, using thermally stable alloy rods with diffusion-hardened wear-resistant surfaces.

Agricultural Harvesting Equipment

Facilitates synchronized lifting in telescopic arms under dusty and abrasive conditions, requiring minimal surface waviness to reduce seal abrasion.

Side Load Resistance and Misalignment Tolerance

Hydraulic Cylinder Piston Rod experiences lateral loads in pivot-mounted systems, demanding high-fatigue steels and optimized geometry at stress transition zones. Large root radii and blended fillets mitigate shear concentration. Structural integrity is validated under eccentric loads using FEA and physical test rigs. Rod ends with clevis, eyes, or spherical bearings reduce bending stress at mounting points.

Hydraulic Cylinder Piston Rod used in high-temperature zones requires stable strength and surface hardness up to 200°C. Chromium-molybdenum alloys resist thermal fatigue and distortion. Ferritic nitrocarburizing forms wear-resistant diffusion layers, while protective atmosphere treatments prevent oxide scaling. These measures ensure reliable performance near furnaces, presses, and casting operations.

Having Doubts? Our FAQ

Check all our Frequently Asked Question

How does Frigate ensure concentricity in long Hydraulic Cylinder Piston Rods?

Frigate uses precision centerless grinding combined with CNC-controlled polishing to maintain total indicator runout (TIR) within 0.02 mm over the full rod length. Each Hydraulic Cylinder Piston Rod is inspected with contact and non-contact metrology systems. This guarantees uniform radial seal loading during dynamic motion. High concentricity reduces seal failure caused by uneven radial stress.

What testing methods does Frigate use to validate fatigue resistance of piston rods?

Frigate applies ultrasonic inspection to detect sub-surface defects and uses magnetic particle testing to identify surface discontinuities. Fatigue resistance is verified through simulation-based FEA and mechanical cyclic load testing. The goal is to ensure the Hydraulic Cylinder Piston Rod endures repeated pressure cycles without cracking. Material traceability is maintained for every batch to track metallurgical consistency.

Can Frigate provide piston rods suitable for aggressive chemical or saline environments?

Frigate offers rods with duplex nickel-chrome or HVOF ceramic coatings for applications exposed to corrosive fluids or saltwater. These coatings exceed 300 hours in ASTM B117 salt spray tests. Substrate materials are selected with low sulfur and controlled inclusion content to minimize corrosion initiation points. This ensures Hydraulic Cylinder Piston Rod performance remains stable in marine, fertilizer, and chemical plant conditions.

How does Frigate control heat treatment quality during induction hardening of piston rods?

Frigate uses CNC-controlled induction coils with real-time temperature monitoring to achieve uniform case depth and hardness. The process targets 50–55 HRC with case depths of 1.5–2.5 mm, depending on load requirements. Each Hydraulic Cylinder Piston Rod is tested using microhardness profiling and surface crack detection. This provides optimal surface durability without compromising core ductility.

What surface finish levels does Frigate maintain to ensure seal longevity in piston rods?

Frigate achieves surface roughness below Ra 0.2 µm through multi-stage grinding and polishing operations. Final inspection includes profilometry to check roughness, waviness, and roundness compliance. These parameters are critical for minimizing friction and wear between the rod and dynamic seals. A smoother Hydraulic Cylinder Piston Rod surface extends seal life and reduces fluid leakage.

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