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- Standards of Carbon Steel Balls
| Grade | Size Range | Diameter Tolerance (µ m) |
Sphericity (µ m) | Batch Diameter Tolerance (µ m) | |
| 10 | 1/16" ~ 1" | 0.25 | 0.25 | 0.50 | |
| 28 | 1/16" ~ 1" | 0.7 | 0.7 | 1.40 | |
| 40 | 1/16" ~ 1" | 1 | 1 | 2.00 | |
| 60 | 1/16" ~ 1" | 1.5 | 1.5 | 3.00 | |
| 100 | 1/16" ~ 1" | 3.0 | 3.0 | 6.00 | |
| 200 | 1/16" ~ 1" | 5.00 | 5.00 | 10.00 | |
| 300 | 1/16" ~ 1" | 7.62 | 7.62 | 15.20 | |
| 500 | 1/16" ~ 1" | 13.0 | 13.0 | 26.0 | |
| 1000 | 1/16" ~ 1" | 25.40 | 25.40 | 50.80 |
| Grade | Size Range | Size Interval (µ m) |
Preferred Size Interval (µ m) |
|---|---|---|---|
| 10 | 1/16" ~ 1" | 1 | -10, ....., -1, 0, +1, ....., +9 |
| 28 | 1/16" ~ 1" | 2.00 | -12, ....., -2, 0, +2, ....., +12 |
| 40 | 1/16" ~ 1" | 4.00 | -16, ....., -4, 0, +4, ....., +16 |
| 60 | 1/16" ~ 1" | 5.00 | -25, ....., -5, 0, +5, ....., +25 |
| 100 | 1/16" ~ 1" | 10.00 | -40, ....., -10, 0, +10, ....., +40 |
| 200 | 1/16" ~ 1" | 15.00 | -60, ....., -15, 0, +15, ....., +60 |
| 300 | 1/16" ~ 1" | - | - |
| 500 | 1/16" ~ 1" | - | - |
| 1000 | 1/16" ~ 1" | - | - |
Definitions:
- Steel Ball Grade: A specific combination of measurement parameters, including surface roughness, sphericity, and gauge values. Steel ball grades are represented by numerical values.
- Steel Ball Diameter Tolerance (Variation): The difference between the maximum and minimum diameter values of a single steel ball of the same size.
- Sphericity: The distance between the maximum radial deviation of the spherical surface of a steel ball and the radial plane, measured around the spherical surface and at any point on the surface.
- Surface Roughness: The deviation in shape caused by irregular undulations on segmented areas of the spherical surface of a steel ball. Ra: Arithmetic mean deviation.
- Batch Diameter Tolerance: The difference between the maximum and minimum average diameter values within the same batch.
- Steel Ball Gauge Interval: The average diameter of a batch should differ from the standard steel ball diameter by a specified amount, which should be confirmed over several consecutive batches.
- The gauge value of each batch of steel balls is determined by the interval between multiple standard sizes, and this specification must be confirmed according to the steel ball grade.
- The gauge value is determined by the combination of the steel ball grade and standard diameter. Special steel ball sizes should be considered based on customer orders and application requirements.