ER40 Collet - 20 mm - DARMET
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Description
Properties and application:
- ER40 collet for tools with a cylindrical shank.
- Collets fit ER40 clamping holders.
- ER40 nuts are used for wedging and clamping the collet.
- Grooves allow the collet to spring.
- The ER collet holder is characterized by a long service life.
- Clamping range: 20.0 - 19.0 mm.
Technical data:

| Parameter | Value | Unit |
|---|---|---|
| d | 20 | 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 |
Assembly of collets in nuts:
|
| ||
| Assembly of the collet in the holder nut | Collet properly installed | Disassembly of the collet |
To properly install the ER collet in the holder, you should:
- Insert the collet at an angle into the nut
- Hook the collet groove onto the eccentric or cylindrical projection of the nut (fig. A)
- Press the collet into the nut (fig. B)
- Thread the nut with the pressed collet onto the holder so that the tool to be machined can be clamped
Maximum clamping diameters depending on the type of ER collet:



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