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Polypac Nitrile (NBR) Piston Rod Seal — Durable Hydraulic Seal

Polypac Nitrile (NBR) piston rod seals offer reliable hydraulic sealing with strong oil and abrasion resistance. Manufactured in advanced facilities, available in custom sizes, ideal for industrial and mobile hydraulic systems.

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Product Description

Polypac Nitrile (NBR) Piston Rod Seal

Polypac Nitrile (NBR) piston rod seals are engineered to provide dependable hydraulic sealing for cylinders in industrial and mobile equipment. Made from high-quality NBR rubber, these piston rod seals combine oil resistance, wear resistance, and long service life to protect your hydraulic systems and reduce maintenance downtime.

Key Benefits

Excellent oil resistance and compatibility with common hydraulic fluids
Strong abrasion resistance for long-lasting performance
Reliable sealing under pressure to prevent leaks and contamination
Custom sizes and tolerances available to meet specific cylinder requirements

Why Choose Polypac

Polypac is a scientific and technical hydraulic seal manufacturer and oil seal supplier specializing in seal production, sealing material development, and customized sealing solutions for special working conditions. Our custom rubber ring and O-ring factory covers more than 10,000 square meters, with 8,000 square meters of factory space. We use advanced production and testing equipment and maintain long-term cooperation with universities and research institutions. Founded in 2008 producing filled PTFE seals, Polypac now offers a wide range of seals and O-rings including NBR, FKM, silicone, EPDM, and FFKM.

Application and Practical Value

Polypac Nitrile (NBR) piston rod seals are ideal for hydraulic cylinders in construction machinery, agricultural equipment, industrial presses, and mobile hydraulics. They help extend cylinder life, cut maintenance costs, and ensure reliable operation in oil-lubricated systems. Customizable options mean you get the right NBR piston rod seal for your exact dimension and working condition.

Ordering and Support

We provide fast quotations, sample support, and technical guidance to help you choose the correct piston rod seal. Polypac focuses on quality, consistency, and customer service so your equipment runs smoothly. Contact us to request Nitrile piston rod seal samples or discuss custom sealing solutions.

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Q&A

What does "AS568" mean?

AS568 is the Aerospace Standard that defines the dimensions for over 360 standard O-ring sizes. It is the most widely accepted sizing system in North America and globally. An AS568 number (e.g., AS568-214) specifies a precise inside diameter and cross-section.

What is the difference between NBR and FKM materials?

NBR (Nitrile/Buna-N): A general-purpose, cost-effective material with excellent resistance to petroleum-based oils and fuels. It has a standard temperature range of -30°C to +100°C (-22°F to +212°F). FKM (Fluoroelastomer/Viton®): A premium material with excellent resistance to high temperatures (up to 200°C+), chemicals, and oils. It is used in more severe environments but is more expensive than NBR.

What is the difference between a static seal and a dynamic seal?

A Static Seal is used between two surfaces that do not move relative to each other (e.g., pipe flanges, end caps). O-rings and gaskets are common static seals. A Dynamic Seal is used between surfaces that do move (e.g., piston and cylinder, rotating shaft). Rod seals, piston seals, and rotary shaft seals are designed for this purpose.

What is the purpose of the metal spring in a rotary shaft seal?

The garter spring in a shaft seal (e.g., FSKR, SPGO types) provides a constant radial force on the sealing lip. This ensures consistent contact with the rotating shaft, compensating for minor wear, eccentricity, and vibration to prevent lubricant leakage.

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