Four-jaw through-hole hydraulic chuck for square parts and four-point CNC lathe clamping.
4-Jaw Hollow Hydraulic Chuck
KORRETTO 4-jaw hollow hydraulic chuck provides synchronized four-jaw hydraulic clamping for square parts, four-sided workpieces and applications where four-point contact is preferred. The hollow structure supports through-spindle passage when tube, bar or long workpiece clearance is required. Selection should check workpiece shape, through-hole size, spindle nose, drawbar stroke, cylinder thrust, jaw stroke and cutting load.
Product Overview
The 4-jaw hollow hydraulic chuck is used when the workpiece benefits from four-point support rather than standard three-jaw clamping. It can be used for square or four-sided parts and selected round parts where contact distribution is important.
This page only covers the 4-jaw hollow hydraulic chuck. No confirmed 4-jaw solid hydraulic chuck data is included in this page.
Key Features
| Feature | Description |
|---|---|
| 4-jaw synchronized clamping | Provides four-point contact for square or four-sided workpieces. |
| Hollow structure | Supports through-spindle passage for suitable bar, tube or long parts. |
| Hydraulic actuation | Works with compatible rotary hydraulic cylinder and drawbar. |
| CNC production use | Suitable for repeat clamping and stable production cycles. |
| Workpiece-specific jaw setup | Jaw selection should follow the workpiece shape and cutting conditions. |
Typical Applications
- Square parts
- Four-sided workpieces
- Tube or bar parts requiring through-hole clearance
- CNC lathe batch turning
- Workpieces requiring four-point support
Technical Data and Dimensions
Use the drawing and parameter table to check chuck size, through-hole diameter, mounting dimensions, jaw stroke, speed, clamping force and compatible cylinder conditions.
Use this drawing to confirm main dimensions, through-hole size and mounting details.
| Model | Spindle Nose | A | B | C (H6) | D | D1 | D2 | E | E1 | F | G max | G min | H | J |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 4K-04 | 110 | 59 | 85 | 70.6 | 4 | 26 | 3.5 | -6.5 | 17.5 | 12 | ||||
| 4K-05 | A4 | 135 | 60 / 71 | 110 | 82.6 | 63.51 | 96 | 4 | 15 | 45 | 26 | -1 / 14 | 20 | 12 |
| 4K-06 | A5 | 169 | 81 / 91 | 140 | 104.8 | 82.56 | 116 | 5 | 23 | 1 | 16 | -9 / 6 | 19 | 20 |
| 4K-08 | A5 | 210 | 91 / 109 | 170 | 133.4 | 82.56 | 104.8 | 5 | 23 | 52 | 37.5 | -1.5 / 21.5 | 20.5 | 30 |
| 4K-08 | A6 | 210 | 91 / 103 | 170 | 133.4 | 106.38 | 150 | 5 | 17 | 52 | 31.5 | -1.5 / 15.5 | 20.5 | 30 |
| 4K-10 | A6 | 254 | 100 / 120 | 220 | 171.4 | 106.38 | 133.4 | 5 | 25 | 75 | 33.5 | -10.5 / 14.5 | 25 | 45 |
| 4K-10 | A8 | 254 | 100 / 113 | 220 | 171.4 | 139.72 | 190 | 5 | 18 | 75 | 26.5 | -10.5 / 7.5 | 25 | 45 |
| 4K-12 | A8 | 304 | 110 / 122 | 220 | 171.4 | 139.72 | 190 | 6 | 18 | 91 | 26 | -15 / 3 | 28 | 50 |
| 4K-15 | A8 | 381 | 133 / 160 | 300 | 235 | 171.4 | 171.4 | 6 | 33 | 120 | 44 | -12 / 21 | 39 | 60 |
| 4K-15 | A11 | 381 | 133 / 149 | 300 | 235 | 196.87 | 260 | 6 | 22 | 120 | 33 | -12 / 10 | 39 | 60 |
| 4K-18 | A11 | 450 | 133 / 149 | 300 | 235 | 196.87 | 260 | 6 | 22 | 120 | 33 | -12 / 10 | 39 | 60 |
| Model | Spindle Nose | Plunger Stroke (mm) | Jaw Stroke (Diameter, mm) | Max. Pull kN (kgf) | Max. Clamping kN (kgf) | Max. Speed (r/min) | Clamping Range (mm) | Moment of Inertia (kg·m²) | Weight (kg) | Matching Cylinder | Max. Pressure MPa (kgf/cm²) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 4K-04 | 10 | 5.4 | 13.7(1400) | 28.4(2900) | 8000 | 7-110 | 0.01 | 4 | 428 | 2.1(21) | |
| 4K-05 | A4 | 10 | 5.4 | 17.1(1750) | 35.8(3650) | 7000 | 12-135 | 0.02 | 6.7 / 7.5 | 536 | 2.6(26) |
| 4K-06 | A5 | 12 | 5.5 | 21.5(2200) | 56.8(5800) | 6000 | 15-168 | 0.06 | 11.9 / 13.7 | 646 | 2.5(25) |
| 4K-08 | A5 | 16 | 7.4 | 34.3(3500) | 85.8(8750) | 5000 | 13-210 | 0.18 | 22.5 / 25.4 | 852 | 2.8(28) |
| 4K-08 | A6 | 16 | 7.4 | 34.3(3500) | 85.8(8750) | 5000 | 13-210 | 0.18 | 22.5 / 23.6 | 852 | 2.8(28) |
| 4K-10 | A6 | 19 | 8.8 | 42.6(4380) | 110.7(11300) | 4200 | 31-254 | 0.33 | 34.5 / 41.65 | 1075 | 2.6(26) |
| 4K-10 | A8 | 19 | 8.8 | 42.6(4380) | 110.7(11300) | 4200 | 31-254 | 0.33 | 34.5 / 40 | 1075 | 2.6(26) |
| 4K-12 | A8 | 23 | 10.6 | 54.9(5600) | 143.6(14650) | 3300 | 34-304 | 0.77 | 56.6 / 59.5 | 1291 | 2.6(26) |
| 4K-15 | A8 | 23 | 10.6 | 71(7250) | 179.8(18350) | 2500 | 50-381 | 2.47 | 120 / 134 | 1512 | 2.4(24) |
| 4K-15 | A11 | 23 | 10.6 | 71(7250) | 179.8(18350) | 2500 | 50-381 | 2.39 | 120 / 127 | 1512 | 2.4(24) |
| 4K-18 | A11 | 23 | 10.6 | 71(7250) | 179.8(18350) | 2000 | 50-450 | 4.78 | 164 / 178 | 1512 | 2.4(24) |
FAQ
What is a 4-jaw hollow hydraulic chuck used for?
It is used for CNC lathe clamping of square, four-sided or special workpieces that benefit from four-point support and may require through-spindle clearance.
Is this the same as a 4-jaw independent chuck?
No. This is a hydraulic power chuck with synchronized jaw movement. A 4-jaw independent chuck is manually adjusted jaw by jaw.
Is this page for hollow or solid 4-jaw hydraulic chucks?
This page is only for the 4-jaw hollow hydraulic chuck. It does not include 4-jaw solid hydraulic chuck data.
What should be checked before selection?
Check workpiece shape, through-hole requirement, spindle nose, mounting dimensions, drawbar stroke, cylinder thrust, jaw stroke, clamping force and maximum speed.
When should I choose a 4-jaw hydraulic chuck instead of a 3-jaw hydraulic chuck?
Choose a 4-jaw hydraulic chuck when the workpiece shape or clamping requirement needs four-point contact or better support for square or four-sided parts.