Dimensions for the various models.
NOTE: As of September 1st , 2024 ER11, ER16 and ER20 models have the same pocket spacing, width, length & height. ER 25 models remain the same.
Check the table below for length and pocket spacing for your model.
Note: the width of the servo housings has changed from 29.6mm to 28.5mm
| Model | Pocket Spacing | Basic Length | Premium Length |
| New 4 Pocket ER11,16 & 20 | 45mm | 218mm | 275mm |
| New 6 Pocket ER11,16 & 20 | 45mm | 308mm | 365mm |
| New 8 Pocket ER11,16 & 20 | 45mm | 398mm | 455mm |
| Old ER11 4 | 38mm | 197mm | 256.2mm |
| Old ER11 6 | 38mm | 273mm | 332.2mm |
| Old ER11 8 | 38mm | 349mm | 408.2mm |
| Old ER16 4 | 42mm | 210mm | 269.2mm |
| Old ER16 6 | 42mm | 294mm | 353.2mm |
| Old ER16 8 | 42mm | 378mm | 437.2mm |
| Old ER20 4 | 45mm | 212mm | 271.2mm |
| Old ER20 6 | 45mm | 302mm | 361.2mm |
| Old ER20 8 | 45mm | 392mm | 451.2mm |
| ER25 4 | 52mm | 258mm | 315mm |
| ER25 6 | 52mm | 362mm | 419mm |
Model and Mounting Pattern Downloads
3D Mock up models in STEP format and DXF format mounting patterns are available for download before purchase, if you would like to check the fit for your machine.
Find the ER collet size and number of pockets you desire. There is a .step and .dxf file of the premium model in each of the zip files. Disregard the housings if you are looking for the basic model.
| New 4 Pocket ER11,16 & 20 | |
| New 6 Pocket ER11,16 & 20 | |
| New 8 Pocket ER11,16 & 20 | |
| Old ER11-4 | |
| Old ER11-6 | |
| Old ER11-8 | |
| Old ER16-4 | |
| Old ER16-6 | |
| Old ER16-8 | |
| Old ER20-4 | |
| Old ER20-6 | |
| Old ER20-8 | |
| ER25-4 | |
| ER25-6 |