Silicon Nitride Ceramic Ball (G5 NCR)

Specifications

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How to choose Ball

Points to check when selecting, with the values for this product (5/32 G5 NCR).

1. 1. Select the material to suit the application

   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

   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

   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 from silicon nitride ceramics. Weighs approximately 40% of high carbon chromium bearing steel, and is non-magnetic and electrically insulating. Used in jigs, tools, solenoid valves, check valves, and various other valves.

FAQ

Q. What are the material and main features of 5/32 G5 NCR?

A. It is a ball made of silicon nitride ceramics. It weighs approximately 40% of high carbon chromium bearing steel and is non-magnetic and electrically insulating. High heat resistance and high corrosion resistance are also key features.

Q. What applications is 5/32 G5 NCR used for?

A. It is used in jigs and tools, solenoid valves and check valves, and various other valves. It is also used in automotive parts and machine parts.

Q. What is the mass of one 5/32 G5 NCR ball?

A. The mass per ball is 1.691 mg.

Q. What is the diameter range of the silicon nitride ceramic ball (G5 NCR)?

A. The product range covers diameters from approximately 0.8 mm to 38.1 mm.

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 軸受・セラミック軸受 (EXSEV Bearings and CERAMIC Bearings for Extreme Special Environments) Open page 51
  Found on: https://koyo.jtekt.co.jp/support/catalog-download/