Jaw-type diaphragm chuck for precision finishing, thin-wall parts and repeatable elastic clamping.
BD-P Jaw-Type Diaphragm Chuck
KORRETTO BD-P jaw-type diaphragm chuck uses the elastic deformation of a diaphragm body to drive jaw-type clamping contact. It is selected for precision finishing, thin-wall workpieces, low-deformation clamping, reduced jaw marks and repeatable location where ordinary jaw chucks may apply uneven force. This page covers the BD-P jaw-type diaphragm chuck, not a diaphragm collet and not the general diaphragm chuck collection page.
Product Overview
The BD-P jaw-type diaphragm chuck is designed for workpieces that need stable location and controlled clamping force during finishing or light machining. The diaphragm structure provides elastic movement, while the jaw-type contact allows the chuck to hold the workpiece in a familiar external clamping format for precision diaphragm workholding.
Selection should confirm the workpiece diameter, clamping surface, wall thickness, required repeatability, machining process, jaw contact form, actuation method and machine interface.
Key Features
| Feature | Description |
|---|---|
| Jaw-type diaphragm clamping | Combines elastic diaphragm movement with jaw-style workpiece contact. |
| Low-deformation holding | Suitable for thin-wall or easily marked workpieces. |
| Repeatable finishing setup | Used where consistent clamping and repeat location are important. |
| Customizable contact area | Jaw contact can be matched to the workpiece surface. |
| Separate from diaphragm collets | This is a chuck-style product, not a collet body. |
Typical Applications
- Thin-wall workpieces
- Precision finishing after rough machining
- Low-deformation external clamping
- Rings, sleeves and round precision parts
- Workpieces requiring repeat location and reduced jaw marks
Technical Data for BD-P Jaw-Type Diaphragm Chucks
Use the drawings and parameter tables to check chuck size, clamping range, jaw interface, connection dimensions, repeatability, maximum speed and machine compatibility.
| Model | Interface | A | B | C | D | E | F | Gmax | Gmin | H | I | J1 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| BD-P138-76 | A2-4 | 165 | 63.513 | 138 | 86 | 18 | 70.5 | 29 | 27.5 | 24 | 15 | 38.5 |
| BD-P138-76 | A2-5 | 165 | 82.563 | 138 | 86 | 15 | 70.5 | 29 | 27.5 | 24 | 15 | 38.5 |
| BD-P213-143 | A2-5 | 192 | 83.563 | 213 | 97 | 18 | 81.5 | 19 | 17.5 | 30 | 18 | 37 |
| BD-P213-143 | A2-6 | 192 | 106.375 | 213 | 97 | 17 | 81.5 | 19 | 17.5 | 30 | 18 | 37 |
| BD-P251-181 | A2-6 | 235 | 106.375 | 251 | 107 | 22 | 88 | 19 | 17.5 | 36 | 20 | 48 |
| BD-P251-181 | A2-8 | 235 | 139.719 | 251 | 107 | 18 | 88 | 19 | 17.5 | 36 | 20 | 48 |
| BD-P327-148 | A2-8 | 285 | 139.719 | 327 | 114.5 | 18 | 95.5 | 34 | 32.5 | 36 | 20 | 48 |
| BD-P327-148 | A2-11 | 285 | 196.869 | 327 | 114.5 | 48 | 95.5 | 34 | 32.5 | 36 | 20 | 48 |
| Model | J2 | K1 | K2 | L | M1 | M2 | M3 | M4 | N (H6) | O | P |
|---|---|---|---|---|---|---|---|---|---|---|---|
| BD-P138-76 | 12 | 45 | 14 | 104.8 | M16 | 3-M6 | 3-M6 | 3-2XM5 | 110 | 5 | 3-φ4.5 |
| BD-P213-143 | 16 | 82 | 20 | 133.4 | M20 | 3-M12 | 3-M8 | 6-2XM8 | 185 | 6 | 3-φ4.5 |
| BD-P251-181 | 19 | 99 | 22 | 171.4 | M24 | 3-M16 | 3-M10 | 6-2XM8 | 220 | 6 | 3-φ4.5 |
| BD-P327-148 | 19 | 135 | 30 | 171.4 | M24 | 3-M16 | 3-M10 | 6-2XM10 | 300 | 7 | 3-φ4.5 |
| Model | Interface | Jaw Stroke (diameter) mm | Jaw Count | Clamping Range mm | Maximum Draw Force kN (kgf) | Maximum Speed r/min | Weight kg |
|---|---|---|---|---|---|---|---|
| BD-P138-76 | A2-4 | 0.45 | 3 | 6.4–76 | 19.6 (2000) | 4500 | 9.3 |
| BD-P138-76 | A2-5 | 0.45 | 3 | 6.4–76 | 19.6 (2000) | 4500 | 8.8 |
| BD-P213-143 | A2-5 | 0.5 | 6 | 76–143 | 34.3 (3500) | 4000 | 20 |
| BD-P213-143 | A2-6 | 0.5 | 6 | 76–143 | 34.3 (3500) | 4000 | 19.5 |
| BD-P251-181 | A2-6 | 0.5 | 6 | 114–181 | 42.6 (4380) | 3500 | 30.5 |
| BD-P251-181 | A2-8 | 0.5 | 6 | 114–181 | 42.6 (4380) | 3500 | 29 |
| BD-P327-148 | A2-8 | 0.5 | 6 | 150–248 | 54.9 (5600) | 3000 | 50 |
| BD-P327-148 | A2-11 | 0.5 | 6 | 150–248 | 54.9 (5600) | 3000 | 57.5 |
Related Diaphragm Chuck Pages
FAQ
What is a BD-P jaw-type diaphragm chuck used for?
It is used for precision diaphragm clamping of workpieces that need elastic, repeatable and low-deformation holding with jaw-type contact.
How is it different from a standard hydraulic chuck?
A jaw-type diaphragm chuck relies on elastic diaphragm deformation to help control clamping force and workpiece distortion. It is usually selected for precision finishing, thin-wall parts or workpieces where ordinary rigid jaw clamping may be too aggressive.
Is this the same as a diaphragm collet?
No. This is a jaw-type diaphragm chuck. A diaphragm collet is a different clamping element and should be selected separately.
When should I choose a jaw-type diaphragm chuck?
Choose it when the part needs more controlled clamping force and better repeatability than a standard jaw chuck can provide.
Is this suitable for heavy roughing?
It is mainly used for precision finishing and controlled clamping. Heavy roughing should be reviewed separately based on cutting load and workpiece structure.
What machine or spindle interface should be confirmed before installation?
The spindle nose, pull-rod interface, available actuation stroke, machine envelope and cooling or sealing conditions should be checked before confirming the chuck model.
What should be checked during daily inspection?
Watch for unusual clamping noise, repeatability drift or sudden changes in draw resistance. If these appear, the chuck and actuation path should be inspected before continued production.
What information is needed for selection?
Provide the workpiece drawing, clamping diameter, wall thickness, clamping surface, machining process, accuracy requirement and machine interface.