Axial draw-down hydraulic chuck for end-face seating and repeat workpiece location.
Pull-Back Hydraulic Chuck
KORRETTO pull-back hydraulic chuck is designed to pull the workpiece toward a locating surface during clamping. The pull-back or draw-down action helps improve axial seating, repeat length control and workpiece location consistency. It is used for CNC lathe applications where radial clamping alone is not enough to control the workpiece position.
Product Overview
A pull-back hydraulic chuck combines radial clamping with axial seating action. During clamping, the workpiece is pulled toward the locating face, helping reduce axial variation between repeated loading cycles.
This page only covers the pull-back hydraulic chuck. It does not cover standard hydraulic chucks, general hollow hydraulic chucks or unrelated internal expansion structures from old templates.
Key Features
| Feature | Description |
|---|---|
| Pull-back / draw-down action | Pulls the workpiece toward a locating surface during clamping. |
| Improved axial seating | Helps improve repeat length control and end-face location. |
| Hydraulic actuation | Works with compatible hydraulic chuck and machine drawbar conditions. |
| Special locating applications | Useful when axial location is more important than standard radial holding alone. |
| CNC lathe use | Suitable for repeated loading and production clamping. |
Typical Applications
- Workpieces requiring end-face seating
- Parts requiring repeat length control
- CNC lathe axial locating applications
- Flange, sleeve or disc-type workpieces
- Jobs where radial clamping alone cannot control axial position
Technical Data and Dimensions
Use the drawing and parameter tables to check spindle nose, mounting dimensions, jaw stroke, pull-back stroke, allowable drawbar force, clamping force, maximum speed, weight and pressure range.
Use this drawing to confirm installation dimensions and technical parameters.
| Model | Spindle Nose | A | B | C (H6) | D | D1 | D2 | E | E1 | F | G | H | J | J1 | K | L1 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| max | min | ||||||||||||||||
| 3PB-06 | A5 | 165 | 85 | 140 | 104.8 | 82.56 | 116 | 5 | 15 | 35 | 30 | 15 | 35 | 32 | 13 | 55 | 13 |
| 3PB-08 | A5 | 210 | 100 | 170 | 133.4 | 104.8 | 23 | 45 | 27 | 7 | 38 | 37 | 16 | 75 | 17 | ||
| A6 | 106.38 | 150 | 17 | ||||||||||||||
| 3PB-10 | A6 | 254 | 110 | 220 | 171.4 | 133.4 | 25 | 55 | 31 | 11 | 41 | 48 | 20 | 85 | 19 | ||
| A8 | 139.72 | 190 | 18 | ||||||||||||||
| Model | Spindle Nose | Wedge Stroke (mm) | Jaw Stroke (Diameter, mm) | Allowable Push/Pull Force kN (kgf) | Max. Clamping Force kN (kgf) | Max. Speed (r/min) | Clamping Range (mm) | Moment of Inertia (kg·m2) | Weight (kg) | Matching Cylinder | Max. Pressure MPa (kgf/cm²) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 3PB-06 | A5 | 15 | 7.8 | 9(910) | 25(2550) | 3500 | 22-165 | 0.05 | 16.8 | 75Q | 2.5(25) |
| 3PB-08 | A5 | 20 | 10.3 | 16(1630) | 45(4590) | 3000 | 28-210 | 0.14 | 28.9 | 100Q | 2.2(22) |
| A6 | 27.1 | ||||||||||
| 3PB-10 | A6 | 20 | 10.3 | 21(2140) | 60(6120) | 2500 | 35-254 | 0.36 | 53.5 | 125Q | 1.9(19) |
| A8 | 51.5 |
Selection Notes
- Confirm the required axial locating face.
- Check pull-back stroke and drawbar movement.
- Match chuck size, spindle nose and hydraulic cylinder force.
- Review clamping force, maximum speed and cutting load.
- Confirm whether the workpiece can be pulled safely against the locating surface.
FAQ
What is a pull-back hydraulic chuck?
It is a hydraulic chuck that pulls the workpiece toward a locating face during clamping, helping improve axial seating and repeat length control.
Is pull-back the same as draw-down?
These terms are often used for similar axial seating concepts. The exact structure should be confirmed by the chuck drawing, pull-back stroke and locating method.
When should I use a pull-back chuck?
Use it when the workpiece must seat against an end face or locating surface and standard radial clamping cannot control axial position well enough.
What information is needed for selection?
Provide the workpiece drawing, locating face, required axial position, machine model, spindle nose, drawbar stroke, hydraulic cylinder data and cutting load.
Is this a standard 3-jaw hydraulic chuck?
No. It is a special hydraulic chuck designed for pull-back or draw-down clamping applications.