JIS B 2401 O-Rings: The Japanese Standard

O-rings are essential components used in many industries to provide a seal between two surfaces. They come in various sizes, shapes, and materials to suit different applications. In Japan, the Japanese Industrial Standards (JIS B 2401) defines the specifications for O-rings used in various industries. In this blog, we will discuss what JIS O-rings are, their specifications, and their advantages.

What are JIS O-Rings?

JIS O-rings are O-rings manufactured in accordance with the Japanese Industrial Standards. These standards provide specifications for dimensions of O-rings used in various industries, such as automotive, aerospace, and electronics. Each of the 261 standard JIS sizes has a specific JIS reference number attached to it that is used to look up the cross sectional diameter (CS) and inside diameter (ID).

JIS O-Ring Specifications

The JIS defines O-ring specifications in terms of their dimensions, material, and performance. Some of the specifications for JIS O-rings include:

• Dimension: JIS O-rings come in different sizes, ranging from 2.5mm to 1044mm in diameter, and 1.5mm to 10mm in cross-section diameter. If you are interested in seeing a full list of sizes, see our JIS O-rings page.

• Material: The JIS specifies the materials used to manufacture O-rings based on their intended application. Some common materials used in JIS O-rings include Nitrile Rubber (NBR), Fluorocarbon Rubber (FKM), and Silicone Rubber (VMQ). However, JIS is frequently used simply to define the size of an O-ring, not necessarily its material characteristics. For example, a specialty application may require a JIS size manufactured from a specialty material that wasn’t accounted for in the JIS specification.

• Performance: The JIS also specifies the performance requirements for O-rings, such as their ability to withstand high and low temperatures, pressure, and chemical resistance. However, JIS is frequently used simply to define the size of an O-ring, not necessarily its material characteristics. For example, a specialty application may require a JIS size manufactured from a specialty material that wasn’t accounted for in the JIS specification.

Advantages of JIS O-Rings

JIS O-rings offer several advantages over other types of O-rings. These include:

• Consistency: JIS O-rings are manufactured to strict standards, ensuring consistent dimensions and material properties. (However, JIS is frequently used simply to define the size of an O-ring, not necessarily its material characteristics.)

• Quality: JIS O-rings are subjected to rigorous testing to ensure they meet the required specifications, ensuring a high level of quality.

• Compatibility: JIS O-rings are compatible with other JIS-approved components, ensuring a proper fit and sealing.

• Availability: Since JIS O-rings are widely used in Japan and other countries, they are readily available from many suppliers.

Conclusion

JIS O-rings are essential components used in various industries to provide a reliable seal between two surfaces. They are manufactured in accordance with strict Japanese Industrial Standards, ensuring consistent dimensions, material properties, and performance. JIS O-rings offer several advantages, such as compatibility with other JIS-approved components, availability, and quality. If you are looking for O-rings for your application, consider using JIS O-rings to ensure reliable and consistent performance.

Where can I get JIS parts?

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