Preface
What is the size of the alumina balls? First of all, it should be known that there are various types of alumina balls, such as inert alumina ceramic balls, grinding ceramic balls, and activated alumina balls, and their specifications are also different. The specific details are as follows:
What is the size of the alumina balls?
Inert alumina ceramic balls: Common sizes include Φ1-2mm, Φ3mm, Φ6mm, Φ8mm, Φ10mm, Φ13mm, Φ16mm, Φ20mm, Φ25mm, Φ30mm, Φ40mm, Φ50mm, etc.
Pressed and ground ceramic balls: Common sizes include Φ30mm, Φ40mm, Φ50mm, Φ60mm, and Φ70mm
Inert open-hole ceramic ball sizes: Φ10mm, Φ13mm, Φ16mm, Φ20mm, Φ25mm, Φ30mm, Φ40mm, Φ50mm, etc.
Activated alumina balls: Generally, they are spherical particles with uniform particle size. Common sizes include 3mm, 4mm, 5mm, 6mm, 8mm, etc. There are also some special specifications that can be customized according to requirements.

Size tolerance:
Diameter Ф | 3 | 6 | 8 | 10 | 13 | 16 | 20 | 25 | 30 | 38 | 50 | 75 |
Size tolerance | ±1.0 | ±1.5 | ±2.0 | ±3.0 |
Table of Dimensions and Strength of Inert Ceramic balls
Size / | Crush Strength | |||
Nominal Size | (lbs) | (kg) | (N/pc) | |
mm | inch | min. | min. | min. |
3 | 1/8″ | 115 | 52 | 510 |
6 | 1/4″ | 230 | 105 | 1030 |
10 | 3/8″ | 440 | 200 | 1961 |
13 | 1/2″ | 1355 | 615 | 6031 |
16 | 5/8″ | 1720 | 780 | 7650 |
19 | 3/4″ | 3344 | 1520 | 14896 |
25 | 1″ | 3432 | 1560 | 15288 |
38 | 1-1/2″ | 4034 | 1830 | 17946 |
50 | 2″ | 4960 | 2250 | 22065 |

Inert alumina ceramic ball size