Ceramic Ball (Silicon Nitride)

Specifications

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How to choose Ball

Points to check when selecting, with the values for this product (Ceramic Ball (Silicon Nitride)).

1. 1. Select the material to suit the application

   This product: Material Silicon nitride ceramics

   Bearing steel is used for high-load bearings, stainless steel where corrosion resistance is required, and carbon steel for light-load, low-cost applications. For high-speed bearings or vacuum environments that require light weight, non-magnetic properties or electrical insulation, silicon nitride is suitable; resin and glass are candidates for applications in contact with chemicals or where anti-rust oil cannot be used.

2. 2. Determine the accuracy grade by required performance

   Grades are indicated as G3 to G1000 and others; a smaller number means smaller variation in sphericity and diameter. For low-noise, high-speed bearings such as machine tool spindles, select a smaller grade; for casters and light-load applications, select a larger grade to avoid over-specification.

3. 3. Check nominal diameter and inch designations

   This product: Nominal diameter Dw 0.8～38.1 mm

   The nominal diameters of listed products range from 0.3 to 101.6 mm. Many inch-based nominal diameters are also available, such as 1/4 inch = 6.35 mm, so confirm whether the design values are metric or inch, and specify a size that matches the raceway groove and cage dimensions.

4. 4. Evaluate rotational quality by sphericity and surface roughness

   Sphericity (2.5 to 25 μm for listed products) and surface roughness Ra (0.01 to 0.15 μm) directly affect vibration, noise and wear. When used as valve seals or reference spheres for measurement, confirm that these two values meet the required accuracy.

5. 5. Check hardness and operating temperature

   This product: Maximum Operating Temperature 800 ℃

   Hardness relates to wear resistance and resistance to indentation, and is indicated in HRC or HV. For high-temperature use, check the maximum operating temperature (288 to 1000 °C for listed products) and hot hardness. Cemented carbide and ceramics tend to retain hardness at high temperatures.

6. 6. Confirm whether secondary processing is possible

   Standard hardened steel balls are very hard, making drilling and welding difficult. For applications such as ball joints, where a shaft is welded to the ball or holes are drilled, select machinable products such as lightly carburized steel balls with shallower case depth, or cut balls with flat surfaces for retention.

This guide was written by AI based on the listed products' documents and specification items.

About Ball and all products

Description

Ball made of silicon nitride ceramics, offering high heat resistance (800 ℃), high rigidity, and usability under ultra-high vacuum. Approximately 40% of the mass of bearing steel, making it lightweight. Used in jigs, tools, gauges, solenoid valves, check valves, various valves, automotive parts, and similar applications. Grades comply with JIS B 1501, and the designation is expressed as "nominal diameter grade symbol material symbol." Mass is calculated using a density of 3.23 g/cm3.

FAQ

Q. What is the upper limit of the operating temperature for the Ceramic Ball (Silicon Nitride)?

A. It has high heat resistance, with a maximum operating temperature of 800 ℃.

Q. What applications can the Ceramic Ball (Silicon Nitride) be used for?

A. It is used in jigs, tools, gauges, solenoid valves, check valves, various valves, high-end bicycle parts, automotive parts, machine parts, and similar applications.

Q. What is the range of nominal diameters and the grade standard for the Ceramic Ball (Silicon Nitride)?

A. Nominal diameter Dw is available from 0.8 to 38.1 mm (1.5 inches). Grades comply with JIS B 1501, and the designation is expressed as "nominal diameter grade symbol material symbol."

Q. Is the Ceramic Ball (Silicon Nitride) lightweight? What are its weight and density?

A. It is lightweight, with a mass of approximately 40% of bearing steel. Its specific gravity (density) is 3.23 g/cm3, and the mass per ball is 0.866 mg.

Q. Can the Ceramic Ball (Silicon Nitride) be used under ultra-high vacuum or in environments involving magnetism or electricity?

A. It can be used under ultra-high vacuum. It is non-magnetic and also has insulating properties.

Written by AI based on the content of the source documents.

Source documents

• Catalog 特殊環境用軸受シリーズ セラミック軸受 Open page 16
  Found on: https://koyo.jtekt.co.jp/support/catalog-download/