Rolling Bearing Steel Balls

Specifications

How to choose Ball

Points to check when selecting, with the values for this product (Rolling Bearing Steel Balls).

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

   This product: Grade (Precision Grade) 3~200

   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 0.3~4 1/8 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

   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

Gauge interval, lot diameter variation, sphericity and surface roughness are specified for each grade. Materials are SUJ2 to SUJ5 high-carbon chromium bearing steel. Nominal diameters range from 0.3 mm to 4 1/8 inch, and non-standard dimensions and accuracies are available upon consultation.

FAQ

Q. If there is no model number for rolling bearing steel balls, which grade and nominal diameter can I choose from?

A. Grades 3 to 200 are available, and nominal diameter Dw is supported from 0.3 to 4 1/8 mm. Non-standard dimensions and accuracies are available upon consultation.

Q. What are the material and hardness of rolling bearing steel balls?

A. The material is SUJ2 to SUJ5 high-carbon chromium bearing steel, with a hardness of HRC 61 to 67.

Q. What applications can rolling bearing steel balls be used for?

A. They are used in bearings for automobiles, motorcycles, machine tools and home appliances. Key features are high load capacity, high precision and low noise.

Q. Which standard do rolling bearing steel balls comply with?

A. They comply with JIS B1501. Gauge interval, lot diameter variation, sphericity and surface roughness are specified for each grade.

Q. What is the range of surface roughness for rolling bearing steel balls?

A. Surface roughness Ra ranges from 0.010 to 0.150 mm Ra.

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

Source documents

• Catalog ツバキ・ナカシマ精密ボール 製品カタログ 25 pages Open page 13
  Found on: https://azuma-eg.com/catalogue/