Piston Rod & Seal Assembly | Component for Drive Mechanisms

Product Specifications

Technical details and manufacturing context for Piston Rod & Seal

Definition

The piston rod and seal assembly is an essential component within drive mechanisms such as motors, pistons, and solenoid systems. It serves two primary functions: the piston rod transmits linear force from the piston to external components, while the seal prevents hydraulic fluid, pneumatic air, or other media from leaking past the rod as it moves through the cylinder housing. This combination ensures efficient power transmission while maintaining system pressure and preventing contamination. The assembly is typically used in hydraulic and pneumatic cylinders, where the rod extends through the cylinder head and connects to the piston inside. The seal, often mounted in the cylinder head, maintains contact with the rod surface through spring tension or interference fit, creating a dynamic barrier that allows smooth rod movement while preventing leakage. Materials commonly used for the rod include chrome-plated steel, stainless steel, and alloy steels like 45# or 40Cr, while seals are made from PTFE, nitrile rubber (NBR), polyurethane, or FKM for high-temperature applications. Key parameters include rod diameter (20–100 mm per ISO 6194), stroke length (100–2000 mm, custom up to 6000 mm), operating pressure (1.0–1.6 MPa), and operating temperature (-20 to 80°C for NBR, up to 150°C for FKM). Surface roughness (Ra 0.2–0.4 µm per ISO 1302), hardness (HRC 40–50 per ISO 6508), and chrome plating thickness (20–50 µm per ISO 6158) are critical for seal life and performance. Seal leakage rate is ≤0.5 mL/min per ISO 6195, and friction force is ≤2% of thrust. Weight ranges from 5 to 50 kg depending on dimensions. Always verify model-specific values and standards with the legal manufacturer or supplier.

Working Principle

The piston rod connects to the piston inside the cylinder and extends through the cylinder head. As hydraulic or pneumatic pressure acts on the piston, the rod transmits this linear force to the external load. The seal, typically mounted in the cylinder head, maintains contact with the rod surface through spring tension or interference fit, creating a dynamic barrier that prevents fluid leakage while allowing smooth rod movement. The seal's performance depends on surface finish, material compatibility, and operating conditions. Proper installation and maintenance are essential to ensure effective sealing and long service life.

Common Materials

Chrome-plated steel, Stainless steel, PTFE (Polytetrafluoroethylene), Nitrile rubber, Polyurethane

Technical Parameters

Parameter	Typical range	Notes & selection driver
Rod Diameter	20–100 mm	Standard sizes per ISO 6194; custom sizes available.ISO 6194
Stroke Length	100–2000 mm	Custom strokes up to 6000 mm on request.
Operating Temperature	-20–80 °C	For NBR seals; FKM up to 150°C.
Surface Roughness	Ra 0.2–0.4 µm	Critical for seal life; smoother reduces friction.ISO 1302
Hardness	HRC 40–50 HRC	Induction hardened; core hardness lower.ISO 6508
Seal Material	NBR/FKM	NBR for oil, FKM for high temp/chemicals.ASTM D2000
Rod Material	45#/40Cr	Chrome-plated for corrosion resistance.GB/T 699
Chrome Plating Thickness	20–50 µm	Hard chrome; thicker for severe environments.ISO 6158
Seal Leakage Rate	≤0.5 mL/min	At rated pressure and speed.ISO 6195
Friction Force	≤2% of thrust	Low friction for smooth operation.
Weight	5–50 kg	Depends on rod diameter and length.

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Piston Rod Part
Transmits linear force from the piston to external components while maintaining structural integrity under load

Material: Chrome-plated steel or stainless steel
Rod Seal Part
Creates a dynamic seal between the moving rod and stationary cylinder head to prevent fluid leakage

Material: PTFE, nitrile rubber, or polyurethane
Wiper Seal Part
Removes contaminants from the rod surface as it retracts to prevent damage to the main seal

Material: Polyurethane or rubber
Backup Ring Part
Prevents extrusion of the main seal under high pressure conditions

Material: PTFE or reinforced plastic

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Drive Mechanism (Motor/Piston/Solenoid)

View system integration details

Manufacturers of Piston Rod & Seal

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Frequently Asked Questions

What is the typical operating pressure range for this piston rod and seal assembly?

The operating pressure range is 1.0 to 1.6 MPa. Always confirm the exact pressure rating for your specific model with the manufacturer.

What materials are available for the rod and seal?

Rod materials include chrome-plated steel, stainless steel, and alloy steels like 45# or 40Cr. Seal materials include PTFE, nitrile rubber (NBR), polyurethane, and FKM for high-temperature or chemical resistance. Material selection depends on the application and media.

How does surface roughness affect seal performance?

Surface roughness of the rod is critical for seal life. The specified range is Ra 0.2–0.4 µm per ISO 1302. Smoother surfaces reduce friction and wear on the seal, while rougher surfaces can cause premature seal failure. Verify the required finish for your application.

What is the maximum stroke length available?

Standard stroke lengths range from 100 to 2000 mm, with custom strokes up to 6000 mm available on request. The actual stroke length depends on the cylinder design and application requirements. Confirm with the supplier for your specific needs.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Up to 300 bar (static), 150 bar (dynamic)
other spec:	Max velocity: 1.5 m/s, Surface finish: Ra ≤ 0.4 μm, Hardness: 58-62 HRC
temperature:	-40°C to +200°C

Piston Rod & Seal

Product Specifications

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