Type A short-taper 4-jaw independent chuck for manual lathe workholding.
4-Jaw Independent Chuck, Type A
KORRETTO 4-Jaw Independent Chuck Type A is a manual lathe chuck with four independently adjustable jaws and a short-taper mounting interface. It is used when the workpiece cannot be held properly by a self-centering chuck, or when offset adjustment, irregular profiles or precise individual jaw setting are required.
Product Overview
The Type A 4-jaw independent chuck allows each jaw to be adjusted separately. This makes it suitable for square parts, rectangular parts, non-round workpieces, castings, forgings and parts that need deliberate offset positioning.
Selection should confirm the chuck size, short-taper spindle interface, mounting dimensions, workpiece shape, clamping range, required runout adjustment and machine compatibility.
Key Features
| Feature | Description |
|---|---|
| Independent jaw adjustment | Each jaw can be set separately for irregular or offset workpieces. |
| Type A mounting interface | Designed for short-taper spindle mounting arrangements. |
| Manual lathe operation | Suitable for manual adjustment and flexible setup work. |
| Strong workpiece adaptability | Useful for round, square, rectangular and non-standard parts. |
| Separate from self-centering chucks | Selected when synchronized jaw movement is not suitable. |
Typical Applications
- Irregular workpieces
- Square and rectangular parts
- Castings and forgings
- Offset turning setups
- Manual lathe workholding
- Workpieces requiring individual jaw adjustment
Technical Data and Dimensions
Use the drawing and parameter table to check chuck size, spindle interface, mounting dimensions, jaw travel, net weight and machine compatibility.
| Size D | Short-Taper No. | D1 | D2 | D3 | H | H1 | h | h1 | h2 | d1 | z-d | Net Weight (kg) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 160 | 4 | 63.513 | 82.6 | 45 | 93 | 65 | 13 | 10 | 6.5 | 14.7 | 4-M10 | 9 |
| 200 | 4 | 63.513 | 82.6 | 56 | 107 | 75 | 13 | — | 6.5 | 14.7 | 4-M10 | 15 |
| 250 | 4 | 63.513 | 82.6 | 61 | 120 | 80 | — | 10 | 6.5 | 14.7 | 4-M10 | 23 |
| 320 350 | 4 | 63.513 | 82.6 | 61 | 134 | 90 | — | 10 | 6.5 | 14.7 | 4-M10 | 40, 53 |
| 200 | 5 | 82.563 | 104.8 | 56 | 107 | 75 | 15 | 12 | 6.5 | 16.3 | 4-M10 | 15 |
| 250 | 5 | 82.563 | 104.8 | 75 | 120 | 80 | 15 | 12 | 6.5 | 16.3 | 4-M10 | 23 |
| 320 350 | 5 | 82.563 | 104.8 | 79 | 134 | 90 | — | 12 | 6.5 | 16.3 | 4-M10 | 40, 53 |
| 400 | 5 | 82.863 | 104.8 | 79 | 143 | 95 | — | 12 | 6.5 | 16.3 | 4-M10 | 58 |
| 200 | 6 | 106.375 | 133.4 | 56 | 107 | 75 | 16 | 13 | 6.5 | 19.5 | 4-M12 | 15 |
| 250 | 6 | 106.375 | 133.4 | 75 | 120 | 80 | 16 | 13 | 6.5 | 19.5 | 4-M12 | 23 |
| 320 350 | 6 | 106.375 | 133.4 | 95 | 134 | 90 | 16 | 13 | 6.5 | 19.5 | 4-M12 | 40, 53 |
| 400 | 6 | 106.375 | 133.4 | 95 | 143 | 95 | 16 | 13 | 6.5 | 19.5 | 4-M12 | 58 |
| 500 | 6 | 106.375 | 133.4 | 103 | 161 | 106 | — | 13 | 6.5 | 19.5 | 4-M12 | 102 |
| 250 | 8 | 139.719 | 171.4 | 75 | 120 | 80 | 18 | 14 | 8.0 | 24.2 | 4-M16 | 23 |
| 320 350 | 8 | 139.719 | 171.4 | 95 | 134 | 90 | 18 | 14 | 8.0 | 24.2 | 4-M16 | 40, 53 |
| 400 | 8 | 139.719 | 171.4 | 125 | 143 | 95 | 18 | 14 | 8.0 | 24.2 | 4-M16 | 55 |
| 500 | 8 | 139.719 | 171.4 | 136 | 161 | 106 | — | 14 | 8.0 | 24.2 | 4-M16 | 102 |
| 320 350 | 11 | 196.869 | 235.0 | 95 | 134 | 90 | 20 | 16 | 10.0 | 29.4 | 4-M20 | 40, 53 |
| 400 | 11 | 196.869 | 235.0 | 125 | 143 | 95 | 20 | 16 | 10.0 | 29.4 | 4-M20 | 58 |
| 500 | 11 | 196.869 | 235.0 | 160 | 161 | 106 | 20 | 16 | 10.0 | 29.4 | 4-M20 | 102 |
| 630 | 11 | 196.869 | 235.0 | 180 | 180 | 118 | 20 | 16 | 10.0 | 29.4 | 4-M20 | 159 |
| 800 | 11 | 196.869 | 235.0 | 185 | 202 | 132 | 20 | 16 | 10.0 | 29.4 | 8-M20 | 255 |
| 1000 | 11 | 196.869 | 235.0 | 182 | 252.5 | 150 | 20 | 16 | 10.0 | 29.4 | 8-M20 | — |
| 500 | 15 | 285.775 | 330.2 | 160 | 161 | 106 | 21 | 17 | 10.0 | 35.7 | 4-M24 | 102 |
| 630 | 15 | 285.775 | 330.2 | 180 | 180 | 118 | 21 | 17 | 10.0 | 35.7 | 4-M24 | 159 |
| 800 | 15 | 285.775 | 330.2 | 210 | 202 | 132 | 21 | 17 | 10.0 | 35.7 | 8-M24 | 255 |
| 1000 | 15 | 285.775 | 330.2 | 280 | 230 | 150 | 21 | 17 | 10.0 | 35.7 | 8-M20 | — |
| 1000 | 15 | 285.775 | 330.2 | 280 | 230 | 150 | 21 | 17 | 10.0 | 35.7 | 8-M24 | 418 |
| 630 | 20 | 412.775 | 463.6 | 180 | 180 | 118 | 23 | 19 | 10 | 42.1 | 8-M24 | 159 |
| 800 | 20 | 412.775 | 463.6 | 305 | 360 | 132 | 23 | 19 | 10 | 42.1 | 8-M24 | — |
| 1000 | 20 | 412.775 | 463.6 | 305 | 360 | 150 | 23 | 19 | 10 | 42.1 | 8-M24 | — |
| 1250 | 20 | 412.775 | 463.6 | 305 | 360 | 165 | 23 | 19 | 10 | 42.1 | 8-M24 | — |
| 1400 | 20 | 412.775 | 463.6 | 305 | 360 | 155 | 23 | 19 | 10 | 42.1 | 8-M24 | — |
| 1600 | 20 | 412.775 | 463.6 | 305 | 360 | 175 | 23 | 19 | 10 | 42.1 | 8-M24 | — |
| 2000 | 20 | 412.775 | 463.6 | 305 | 290 | 190 | 23 | 19 | 10 | 42.1 | 8-M24 | — |
Related Manual Chuck Pages
FAQ
What is a 4-jaw independent chuck used for?
It is used for holding workpieces that require individual jaw adjustment, such as irregular, square, rectangular or offset parts.
Is this the same as a 4-jaw self-centering chuck?
No. A 4-jaw independent chuck has separately adjustable jaws. A self-centering chuck moves the jaws together.
What does Type A mean on this chuck?
Type A refers to the short-taper mounting style. The spindle interface and mounting dimensions must be checked before selection.
When should I choose Type A instead of a plain-back chuck?
Choose Type A when the machine spindle and mounting arrangement require a short-taper chuck interface.
Can this chuck be used for offset turning?
Yes. Because each jaw can be adjusted separately, it can be used for controlled offset setup when the workpiece and process allow it.
What information is needed for selection?
Provide the chuck size, spindle nose or short-taper number, workpiece drawing, clamping range, machine model and accuracy requirement.