Internal expansion rubber-flex collet body for blind-hole and semi-through-hole workpieces.
Rubber-Flex Expanding Collet for Blind Holes
KORRETTO rubber-flex expanding collet for blind holes is the replaceable internal expansion element used for blind-hole and semi-through-hole workpieces. It expands inside the bore to support and clamp the part from the inside diameter. This page covers the expanding collet body only, not the complete blind-hole expanding chuck assembly.
Product Overview
This rubber-flex expanding collet is used when the workpiece must be held from the inside and the bore is blind or only partly open. It works as the expanding element within a matched chuck or mandrel assembly.
Selection should confirm the expansion range, bore tolerance, maximum length, workpiece material, support length and matching chuck or actuator structure.
Key Features
| Feature | Description |
|---|---|
| Blind-hole internal expansion | Designed for blind-hole and semi-through-hole workpieces. |
| Replaceable expanding element | Used as the collet body within a matched expanding chuck system. |
| Rubber-flex contact | Provides distributed contact inside the bore. |
| Separate from chuck assembly | The complete blind-hole chuck assembly is handled on another page. |
| Bore-based selection | Bore diameter, tolerance and depth must be checked before selection. |
Typical Applications
- Blind-hole workpieces
- Semi-through-hole workpieces
- Bore-located parts
- Internal expansion clamping
- Workpieces requiring outside-surface machining
Technical Data and Dimensions
Use the parameter table to check model, expansion range, recommended workpiece tolerance and maximum length.
| Model | Expansion Range (mm) | Recommended Workpiece Tolerance (mm) | Maximum Length (mm) |
|---|---|---|---|
| SB2A0 | 8–13 | ±0.2 | 6–12.9 |
| SB2A1 | 13–19 | ±0.25 | 14 |
| SB2A2 | 19–26 | ±0.25 | 20 |
| SB2A3 | 26–38 | ±0.3 | 25 |
| SB2A4 | 38–50 | ±0.35 | 30 |
Related Rubber-Flex Pages
FAQ
What is a rubber-flex expanding collet for blind holes?
It is a replaceable internal expansion rubber-flex element used to clamp workpieces from blind holes or semi-through holes.
Is this a complete chuck?
No. This page covers the expanding collet body. The complete blind-hole expanding chuck assembly is handled separately.
How is it different from a through-hole expanding collet?
This product is for blind-hole or semi-through-hole workpieces. Through-hole expanding collets are selected for open-through bores.
What should be checked before selection?
Check bore diameter, bore depth, expansion range, workpiece tolerance, maximum length and matching chuck system.
Can this be used when the outside surface needs machining?
Yes. Internal expansion clamping is often selected when outside surfaces must remain accessible.
What information is needed?
Provide the workpiece drawing, bore size, bore depth, tolerance, material, support length and matching chuck or mandrel system.