ER40 Collet - 12 mm - DARMET
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Description
Properties and Applications:
- ER40 collet for tools with cylindrical shanks.
- Collets fit ER40 collet chucks.
- ER40 nuts are used for wedging and clamping the collet body.
- Slots allow the collet to act as a spring.
- The ER collet body features a long service life.
- Clamping range: 12.0 - 11.0 mm.
Technical Data:

| Parameter | Value | Unit |
|---|---|---|
| d | 12 | mm |
| D | 40 | mm |
| D1 | 41 | mm |
| D2 | 36.2 | mm |
| L | 46 | mm |
| L1 | 7.66 | mm |
| L2 | 7 | mm |
| L3 | 4.1 | mm |
Installing Collets in Nuts:
|
| ||
| Installing the collet in the chuck nut | Collet properly installed | Removing the collet |
To properly install the ER collet in the chuck, you should:
- Insert the collet at an angle into the nut
- Engage the collet groove with the eccentric or cylindrical protrusion of the nut (fig. A)
- Push the collet into the nut (fig. B)
- Screw the nut with the pressed collet onto the chuck so that the tool can be clamped
Maximum clamping diameters depending on ER collet type:



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