O-Ring Size Chart Parker
O-Ring Size Chart Parker

The O-Ring Size Chart Parker Your Comprehensive Guide

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When it comes to hydraulic and pneumatic systems, getting the right O-ring size is crucial. Parker Hannifin, a leader in motion and control technologies, provides a comprehensive O-Ring Size Chart to assist engineers, technicians, and DIY enthusiasts. In this guide, we will demystify the O-Ring Size Chart Parker, making it easier for you to select the perfect O-ring for your application.

Understanding O-Rings The Basics:

Before we delve into the specifics of Parker’s O-Ring Size Chart, it’s essential to have a clear understanding of O-rings themselves. These are donut-shaped seals typically made of elastomers like nitrile rubber, silicone, or Viton. O-rings play a vital role in sealing fluid or gas within a system.

  1. Functions of O-Rings

O-rings prevent leaks and maintain the integrity of a hydraulic or pneumatic system by sealing the gaps between mating parts. Their flexibility and resilience make them ideal for dynamic and static sealing applications.

  1. Common O-Ring Materials

There’s a wide variety of O-ring materials available, each suited for specific conditions. Nitrile rubber is a popular choice for general-purpose sealing, while Viton excels in high-temperature and chemical environments. Understanding these materials is essential when using the O-Ring Size Chart.

Navigating The Parker O-Ring Size Chart:

Parker’s O-Ring Size Chart is a comprehensive resource for finding the right O-ring size for your application. It includes a vast array of sizes and materials, so it’s crucial to know how to read and use it effectively.

  • Size Reference

The first column of the chart lists O-ring sizes, typically indicated in inches. It’s important to note that these sizes refer to the O-ring’s inside diameter (ID).

  • Material Options

The second column specifies the material for each Parker O-Ring Size Chart offers various materials, including nitrile, Viton, silicone, and more. Choose the material that best suits your application’s requirements for temperature resistance, chemical compatibility, and longevity.

  • Cross-Section

The third column provides the O-ring’s cross-section or thickness, typically measured in inches. It’s essential to ensure the cross-section matches the groove or housing in your application.

  • Durometer (Hardness)

The fourth column indicates the hardness of the O-ring, measured in durometer (Shore A). Different applications may require O-rings with varying levels of hardness for optimal sealing.

  • Parker Part Number

The fifth column lists Parker’s part numbers for each O-ring size and material. This is valuable when ordering or referencing specific O-rings.

Selecting The Right O-Ring Size:

Now that you understand how to interpret the O-Ring Size Chart, the next step is to choose the right O-ring for your needs.

  1. Measure Your Application

Start by measuring the groove or housing where the O-ring will be placed. Take the inside diameter (ID) and cross-section measurements precisely to ensure a proper fit.

  1. Consider Material Compatibility

Consider the conditions your O-ring will be exposed to. Choose a material that can withstand the temperature, pressure, and chemicals present in your application.

  1. Factor in Durometer

Determine the necessary durometer based on the sealing surface and the level of compression the O-ring will experience.

  1. Refer to Parker’s Chart

Using the measurements and requirements you’ve gathered, refer to the Parker O-Ring Size Chart. Locate the size and material that matches your needs and make a note of the Parker part number.

Where To Source Parker O-Rings:

Parker O-rings are widely used and available from various suppliers. It’s important to choose a reputable source to ensure the quality and authenticity of the product.

  • Authorized Parker Distributors

Parker Hannifin authorizes specific distributors to provide its products. These distributors are well-versed in Parker’s catalog and can offer expert advice on selecting the right O-rings.

  • Online Marketplaces

You can find Parker O-rings on popular online marketplaces. However, exercise caution and ensure the seller is reliable and offers genuine Parker products.

  • Local Hardware Stores

Some local hardware and industrial supply stores may carry Parker O-rings. It’s a convenient option if you need O-rings quickly for minor repairs or replacements.

Proper O-Ring Installation and Maintenance:

Once you’ve obtained the right Parker O-ring, proper installation and maintenance are crucial to ensure it performs as expected.

  • Installation Guidelines

Follow Parker’s installation guidelines to ensure the O-ring is correctly seated in the groove or housing. Proper installation prevents damage and leaks.

  • Regular Inspection

Regularly inspect O-rings for wear, damage, or degradation. Replace them as needed to maintain the integrity of your hydraulic or pneumatic system.


In conclusion, the Parker O-Ring Size Chart is a valuable tool for selecting the right O-ring for your hydraulic and pneumatic systems. Understanding O-ring basics, the chart’s structure and the selection process is essential for successful sealing and system performance. Whether you’re a professional engineer or a DIY enthusiast, knowing how to navigate the SO-Ring Size Chart will save you time, money, and headaches in the long run. So, the next time you’re faced with the task of choosing an O-ring, remember this guide, and make the right selection with confidence.

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