Replaceable rubber-flex clamping element for round, square, hex and profile workpieces.
Rubber-Flex Collet
KORRETTO rubber-flex collet is the replaceable clamping element used in rubber-flex chuck systems. It supports round, square, hex and selected profile workpieces depending on the collet specification. This page covers the rubber-flex collet body itself, not the chuck body, not the inner-stop assembly and not the changeover or bore tooling.

Product Overview
Rubber-flex collets provide distributed clamping contact around the workpiece. They are used when the workpiece shape and size match the collet range and when uniform support, reduced marking and repeat clamping are required.
Selection should confirm the collet type, code, length, outside diameter, workpiece clamping shape, clamping diameter and matching chuck system.
Key Features
| Feature | Description |
|---|---|
| Replaceable collet body | Used as the clamping element inside a compatible rubber-flex chuck system. |
| Multiple clamping shapes | Can be selected for round, square, hex or specified profiles. |
| Uniform contact | Supports the workpiece around the clamping area. |
| Mark reduction | Helps reduce point-contact marks compared with jaw clamping. |
| Separate from tooling pages | Bore tools and changeover tools are handled separately. |
Typical Applications
- Rubber-flex chuck systems
- Round, square and hex workpieces
- Precision turned parts
- Workpieces requiring reduced clamping marks
- Replacement collet selection
- Stable repeat clamping
Technical Data and Dimensions
Use the drawing and parameter table to check type, code, length, outside diameter and clamping range for round, square or hex workpieces.

| Type | Code | L (mm) | D (mm) | d (Round) (mm) | d (Square) (mm) | d (Hex) (mm) |
|---|---|---|---|---|---|---|
| 32 | 32S | 44 | 57.7 | 6–32 | 7–27 | 7–22 |
| 32 | 32R | 44 | 57.7 | 8–32 | 8–27 | 8–22 |
| 42 | 42S | 53 | 70.5 | 10–42 | 12–36 | 12–30 |
| 42 | 42R | 53 | 70.5 | 14–42 | 14–36 | 14–30 |
| 52 | 52S | 63 | 84.5 | 16–52 | 16–46 | 16–39 |
| 65 | 65S | 78 | 105 | 20–65 | 20–58 | 20–50 |
Related Rubber-Flex Pages
FAQ
What is a rubber-flex collet?
It is the replaceable rubber-flex clamping element used inside a compatible rubber-flex chuck system.
Is this a complete chuck?
No. This page covers the collet body itself. Complete chuck assemblies are listed separately.
What shapes can it clamp?
Depending on the specification, rubber-flex collets can be selected for round, square, hex or profile workpieces.
How should I select the correct collet?
Confirm the workpiece shape, clamping diameter, tolerance, collet code and compatible chuck model.
Is this the same as an expanding collet?
No. This page covers the external clamping rubber-flex collet body. Internal expansion rubber-flex collets are separate products.
What information is needed for selection?
Provide the workpiece drawing, shape, clamping diameter, tolerance, material, matching chuck model and required clamping accuracy.