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Polypac Metric Piston Seal Kit — Precision Hydraulic Seals

Polypac Metric Piston Seal Kit — Precision Metric Piston Sealing

Polypac’s Metric Piston Seal Kit is engineered for rigorous hydraulic applications where reliability, repeatability, and fit matter. Each kit is optimized for metric cylinders and pistons, offering tight tolerance sealing that reduces leakage, extends service life, and simplifies maintenance for OEMs and service shops alike.

Performance and Material Options

Choose from a broad range of materials including filled PTFE (bronze, carbon, graphite, MoS₂, glass), NBR, FKM, EPDM, silicone, and FFKM to match pressure, temperature, and chemical exposure. The Metric Piston Seal Kit delivers low friction, high wear resistance, and excellent extrusion resistance for dynamic piston sealing.

Custom Manufacturing and Metric Precision

Polypac’s custom rubber ring and O-ring factory spans over 10,000 m² with 8,000 m² of production space. Advanced CNC tooling and molding ensure metric dimensional accuracy across batch production. We offer customized kits for special clearances, custom stack-ups, and non-standard diameters to meet unique cylinder designs.

Quality Control and Testing

Our production and testing equipment are among the most advanced in the industry. Each Metric Piston Seal Kit undergoes rigorous dimensional inspection, material certification, and performance testing including wear, pressure, and temperature cycling. Long-term partnerships with universities and research institutes ensure continuous material and process improvements.

Applications and Compatibility

Ideal for mobile hydraulics, industrial presses, injection molding, and marine cylinders, the Metric Piston Seal Kit is compatible with both new builds and repair kits. Metric sizing simplifies global sourcing and installation for international OEMs and maintenance teams.

Ordering, Support, and Value

Polypac provides technical support for material selection and seal stack design, fast prototyping, and scalable production runs. Benefit from competitive lead times, robust testing, and proven field performance. Contact Polypac to specify your Metric Piston Seal Kit and receive tailored sealing solutions backed by decades of sealing expertise.

Metric Piston Seal Kit Display

FAQ:

Can I reuse a seal?

We strongly recommend never reusing seals. Once compressed and used, a seal takes a "set" and its elastic properties are degraded. Reusing it almost always results in a leak. Always install a new seal during any maintenance or repair.

Why did my O-ring fail prematurely?

Common causes of O-ring failure include: Chemical Incompatibility: Swelling, softening, or cracking due to fluid exposure. Improper Sizing: Using an incorrect size leads to over-compression or inadequate sealing force. Abrasion: Wear and tear from rough surface finishes or contaminated fluid. Extrusion: The seal is forced into the gap between metal parts under high pressure. Installation Damage: Nicks, cuts, or twists during assembly.

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 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 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.

Table of Contents

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Polypac Metric Piston Seal Kit — Precision Metric Piston Sealing
Performance and Material Options
Custom Manufacturing and Metric Precision
Quality Control and Testing
Applications and Compatibility
Ordering, Support, and Value
Metric Piston Seal Kit Display

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