Rear-actuated passive diaphragm chuck unit for compact front-end precision clamping.
Rear-Actuated Passive Diaphragm Chuck
KORRETTO rear-actuated passive diaphragm chuck is a complete diaphragm chuck unit in which rear-side pneumatic or hydraulic actuation applies axial force to deform the diaphragm and clamp or release the workpiece at the front. The front clamping area can remain compact, making this structure suitable for precision fixtures and machine layouts with limited front-end space. This page covers the rear-actuated passive diaphragm chuck, not a fixed diaphragm chuck and not a diaphragm collet.
Product Overview
The rear-actuated passive diaphragm chuck is selected when the actuation mechanism is arranged behind the chuck or fixture, while the front clamping area needs to stay compact. It is suitable for high-precision external clamping, thin-wall parts, deformation-sensitive workpieces and repeated batch loading.
Multiple chuck units may be arranged on a base plate for multi-station fixtures, sequential machining, simultaneous clamping of several workpieces or batch production. Selection should confirm workpiece diameter, clamping surface, actuation method, axial force, fixture layout, repeatability and machine interface.
Key Features
| Feature | Description |
|---|---|
| Rear-side actuation | Pneumatic or hydraulic force is applied from behind the chuck unit. |
| Compact front clamping area | Useful when front-end installation space is limited. |
| Passive diaphragm clamping | The diaphragm deforms elastically to clamp and release the workpiece. |
| Suitable for repeat loading | Used for batch production and multi-station fixture layouts. |
| Separate from fixed diaphragm chuck | This page covers the rear-actuated passive type. |
Typical Applications
- Thin-wall precision workpieces
- High-repeatability finishing setups
- Compact front-end fixture layouts
- Multi-station diaphragm chuck fixtures
- Deformation-sensitive external clamping
- Batch production requiring consistent loading
Technical Data and Dimensions
Use the drawing and parameter table to check chuck size, clamping range, rear actuation interface, connection dimensions, repeatability, maximum speed and fixture compatibility.
| Model | ΦA | ΦB | ΦC | ΦD | ΦE | F | ΦG | L | I | II | ΦH | Working Pressure (kg/cm²) | Clamping Stroke (mm) | Compatible Collet |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| JP4-60 | 116 | 72 | M12×1.5 | 45 | 60 | 5 | 100 | 41 | 6-M5 CSK | 6-M4 TAP | 52 | 2～7 | 0.1 | JD-60 |
| JP5-70 | 147 | 125 | M32×1.5 | 50 | 70 | 5 | 106 | 51 | 6-M6 CSK | 6-M5 TAP | 60 | 2～7 | 0.3 | JD-70 |
| JP6-100 | 177 | 155 | M55×2 | 80 | 100 | 5 | 133.4 | 51 | 6-M8 CSK | 8-M5 TAP | 90 | 2～7 | 0.3 | JD-100 |
| JP8-150 | 220 | 190 | M80×2 | 120 | 150 | 5 | 171.4 | 57 | 8-M8 CSK | 8-M6 TAP | 135 | 2～7 | 0.3 | JD-150 |
Related Diaphragm Chuck Pages
FAQ
What is a rear-actuated passive diaphragm chuck?
It is a complete diaphragm chuck unit actuated from the rear. Rear-side force deforms the diaphragm to clamp and release the workpiece at the front.
Is this the same as a fixed diaphragm chuck?
No. A fixed diaphragm chuck uses a different installation and actuation arrangement. This page covers the rear-actuated passive type.
Is this a diaphragm collet?
No. This is a complete chuck unit. A diaphragm collet is a separate clamping element.
When should I choose rear-side actuation?
Choose it when the front clamping area must remain compact or when the fixture layout requires the actuation mechanism behind the chuck.
Can several units be mounted together?
Yes, multiple units can be arranged on a base plate for multi-station fixtures if the workpiece, fixture and actuation layout allow it.
What information is needed for selection?
Provide the workpiece drawing, clamping diameter, clamping surface, actuation method, fixture layout, machine interface and required repeatability.