Autoround

Autoround logo 3

Autoround——Auto Parts Wholesale

Autoround——Auto Parts Wholesale

Bearing Steel Ball Grade

Steel ball grade classification:

The grades of steel balls are generally divided according to parameters such as diameter, roundness, and surface finish. Common grades include G3, G5, G10, G16, G20, G24, G28, G40, G60, G100, G200, etc. 

 

Accuracy index:

  • TDB: Diameter tolerance range: specifies the maximum and minimum deviation values ​​allowed for the steel ball diameter.
  • VDWL: Ball batch diameter variation: When a batch of steel balls is used together, this indicator measures the consistency of the diameter of the entire batch of steel balls.
  • VDWS: Ball diameter variation: This is an indicator to measure the consistency of steel ball diameter, which is crucial to ensure the stability and accuracy of the rolling element.
  • △Spn: Spherical error: refers to the degree of deviation of the steel ball from the perfect spherical shape, reflecting the roundness of the steel ball.
  • Ra: Surface roughness: describes the smoothness of the steel ball surface, which is important for reducing friction and increasing service life.

Precision standard unit: These precision indicators are usually measured in microns (μm) to ensure precise control of rolling element performance.

 

Customization service:  Autoround can customize G10 and above bearing steel balls according to customer needs to meet the high precision requirements of special applications.

 

ISO 3290 2001
Level Ball diameter TDB VDWL VDWS △Spn Ra
G3 1/16″~40mm

 

 

 

 

 

 

 

 

 

 

±5 0.13 0.08 0.08 0.01
G5 ±5 0.25 0.13 0.13 0.014
G10 ±9 0.5 0.25 0.25 0.02
G16 ±10 0.8 0.4 0.4 0.025
G20 ±10 1 0.5 0.5 0.032
G24 ±12 1.2 0.6 0.6 0.04
G28 ±12 1.4 0.7 0.7 0.05
G40 ±16 2 1 1 0.06
G60 ±18 3 1.5 1.5 0.08
G100 ±40 5 2.5 2.5 0.1
G200 ±60 10 5 5 0.15

 

American AFBMA 10 1989
Level Ball diameter TDB VDWL VDWS △Spn Ra
G3 1/16″~40mm

 

 

 

 

 

 

 

 

 

±0.76 0.13 0.08 0.08 0.012
G5 ±1.27 0.25 0.13 0.13 0.02
G10 ±2.54 0.5 0.25 0.25 0.025
G16 ±2.54 0.8 0.4 0.4 0.032
G24 ±2.54 1.2 0.6 0.6 0.05
G48 ±5.08 2.4 1.2 1.2 0.08
G100 ±12.7 5 2.5 2.5 0.125
G200 ±25.4 10 5 5 0.2
G500 ±50.8 25 13 13 ……
G1000 ±127 50 25 25 ……
G2000 ±127 100 50 50 ……

 

Japan JIS B 1501 198
Level Ball diameter TDB VDWL VDWS △Spn Ra
G3 1/16″~40mm

 

 

 

 

 

 

 

 

 

±5 0.13 0.08 0.08 0.012
G5 ±5 0.25 0.13 0.13 0.02
G10 ±9 0.5 0.25 0.25 0.025
G16 ±10 0.8 0.4 0.4 0.032
G20 ±10 1 0.5 0.5 0.04
G28 ±12 1.4 0.7 0.7 0.05
G40 ±16 2 1 1 0.008
G60 ±25 3 1.5 1.5 0.095
G100 ±40 5 2.5 2.5 0.125
G200 ±60 10 5 5 0.2
G200 ±60 10 5 5 0.15

 

German DIN  5401  2002
Level Ball diameter TDB VDWL VDWS △Spn Ra
G3 1/16″~1/2″

 

±5.32 0.13 0.08 0.08 0.01
G5 ±5.63 0.25 0.13 0.13 0.014
G10 1/16″~1″

 

±9.75 0.5 0.25 0.25 0.02
G16 ±11.4 0.8 0.4 0.4 0.025
G20 1/16″~1 1/2″ ±11.5 1 0.5 0.5 0.032
G28 1/16″~40mm

 

 

 

±13.7 1.4 0.7 0.7 0.05
G40 ±19 2 1 1 0.06
G100 ±47.5 5 2.5 2.5 0.1
G200 ±72.5 10 5 5 0.15
G300 1/16″~1″ ±70 —- 10 10 0.2
G300 1″~40mm ±+105 —- 15 15 0.2
G500 1/16″~1″ ±75 —- 25 25 0.2
G500 1″~40mm ±112.5 —- 25 25 0.2
G600 1/16″~40mm ±200 —- —- —- —-
G700 ±1000 —- —- —- —-