KORRETTO · CLAMPING HEAD SYSTEMS
Segmented Clamping Bushing for Blind-Hole Clamping
The Segmented Clamping Bushing for Blind-Hole Clamping (SB2 series) is the replaceable gripping element for a matching Blind-Hole Segmented Mandrel System. Also called an internal expanding rubber-flex collet, it grips the bore and leaves the outside surface available for machining.
How It Works
The mandrel moves against the bushing to expand its steel segments against the workpiece bore. Vulcanized rubber connects the separated segments for parallel expansion. Match the SB2 bushing to the mandrel size, usable bore depth and workpiece tolerance.
Selection should confirm the expansion range, bore tolerance, maximum length, workpiece material, support length and matching chuck or actuator structure.
Key Features
Blind-hole clamping
For internal gripping where usable bore depth matters.
Replaceable SB2 bushing
Select the bushing and matching mandrel as a compatible pair.
Steel gripping segments
Hardened steel contacts the bore; rubber joins the segments.
Eleven catalog sizes
Compare SB2A0-SB270 using the complete size table.
Typical Applications
- Blind-hole workpieces
- Semi-through-hole workpieces
- Bore-located parts
- Internal expansion clamping
- Workpieces requiring outside-surface machining
Technical Data: Segmented Clamping Bushing for Blind-Hole Clamping
Use the parameter table to check model, expansion range, recommended workpiece tolerance and maximum length.
| Model | Clamping diameter / range (mm) | Recommended workpiece tolerance (mm) | Maximum clamping length (mm) | Size increment (mm) |
|---|---|---|---|---|
| SB2A0 | 8 | ±0.2 | 6 | 0.5 |
| SB2A0 | 8.5 | ±0.2 | 6.7 | 0.5 |
| SB2A0 | 9 | ±0.2 | 7.4 | 0.5 |
| SB2A0 | 9.5 | ±0.2 | 8.1 | 0.5 |
| SB2A0 | 10 | ±0.2 | 8.8 | 0.5 |
| SB2A0 | 10.5 | ±0.2 | 9.4 | 0.5 |
| SB2A0 | 11 | ±0.2 | 10.1 | 0.5 |
| SB2A0 | 11.5 | ±0.2 | 10.8 | 0.5 |
| SB2A0 | 12 | ±0.2 | 11.5 | 0.5 |
| SB2A0 | 12.5 | ±0.2 | 12.2 | 0.5 |
| SB2A0 | 13 | ±0.2 | 12.9 | 0.5 |
| SB2A1 | 13–19 | ±0.25 | 14 | 0.5 |
| SB2A2 | 16–21 | ±0.25 | 15 | 0.5 |
| SB200 | 20–28 | ±0.25 | 21 | 0.5 |
| SB210 | 26–38 | ±0.25 | 25 | 0.5 |
| SB220 | 36–54 | ±0.25 | 40 | 0.5 |
| SB230 | 50–80 | ±0.35 | 44.5 | 0.5 |
| SB240 | 69–100 | ±0.4 | 52.5 | 0.5 |
| SB250 | 100–130 | ±0.5 | 53 | 1 |
| SB260 | 130–160 | ±0.5 | 61 | 1 |
| SB270 | 160–190 | ±0.5 | 63 | 1 |
Download the product datasheet (PDF)
The size increment is the catalog "By" value. It describes available size steps, not the expansion stroke of an individual bushing.
What to Provide Before Quotation
- SB2 code or existing mandrel model
- Bore diameter, tolerance and usable depth
- Gripping length, material and outside machining area
Related Clamping Head Systems
FAQ
What is the Segmented Clamping Bushing for Blind-Hole Clamping used for?
The Segmented Clamping Bushing for Blind-Hole Clamping (SB2 series) is the replaceable gripping element for a matching Blind-Hole Segmented Mandrel System. It grips the bore and leaves the outside surface available for machining.
Is this a complete chuck?
No. It is a replaceable segmented clamping bushing. It must be installed on the corresponding expanding mandrel with the correct connection and locating components.
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.