| D100 separation µm | API screen number | D100 separation µm | API screen number | |
| > 780,0 to 925,0 | API 20 | > 165,0 to 196,0 | API 80 | |
| > 655,0 to 780,0 | API 25 | > 137,5 to 165,0 | API 100 | |
| > 550,0 to 655,0 | API 30 | > 116,5 to 137,5 | API 120 | |
| > 462,5 to 550,0 | API 35 | > 98,0 to 116,5 | API 140 | |
| > 390,0 to 462,5 | API 40 | > 82,5 to 98,0 | API 170 | |
| > 327,5 to 390,0 | API 45 | > 69,0 to 82,5 | API 200 | |
| > 275,0 to 327,5 | API 50 | > 58,0 to 69,0 | API 230 | |
| > 231,0 to 275,0 | API 60 | > 49,0 to 58,0 | API 270 | |
| > 196,0 to 231,0 | API 70 | > 41,5 to 49,0 | API 325 |
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Shale shakers are components of drilling equipment used in many industries, such as coal cleaning, mining, oil and gas drilling. They are the first phase of a solid controls system on a drilling rig, and are used to remove large solids (cuttings) from the drilling fluids (“mud”).