Pull-Back Hydraulic Chuck
The pull-back action helps pull the workpiece toward the locating surface during clamping. It is used when axial position consistency matters.
Special hydraulic chuck solutions for pull-back clamping, floating compensation, face clamping and pipe-thread workholding.
Special Hydraulic Chucks
KORRETTO special hydraulic chucks are designed for workpieces that cannot be held reliably by standard hydraulic jaw chucks. This range includes pull-back hydraulic chucks, ball-joint hydraulic chucks, compensating hydraulic chucks with floating jaws, finger / face-clamping chucks and oil pipe thread chucks. They are used when the process requires axial pull-down, end-face location, compensation for irregular surfaces, long-shaft support, reduced outside-diameter interference or pipe-thread machining.
Ball-Joint Hydraulic Chuck
The ball-joint structure helps support workpieces where standard radial clamping cannot provide stable alignment alone.
Compensating Hydraulic Chuck with Floating Jaws
Floating jaws allow the clamping points to adapt to uneven or irregular surfaces, helping support castings, forged blanks and out-of-round workpieces more evenly.
Finger / Face-Clamping Chuck
Finger-type clamping holds the part from the end face or limited contact areas, reducing interference with the outer profile.
Oil Pipe Thread Chuck
This product is used for oil pipe thread machining. “Front-mounted pneumatic” describes the structure; “oil pipe thread chuck” describes the application.
How to Select a Special Hydraulic Chuck
- Start from the clamping problem
Use this category when a standard 3-jaw or 4-jaw hydraulic chuck cannot provide the required location, compensation, contact surface or access. - Confirm the locating method
Check whether the workpiece should be located by outside diameter, inside diameter, end face, center support or pipe-end reference. - Check axial force and stroke
Pull-back, draw-down and face-clamping structures require careful review of drawbar stroke, cylinder force and locating surface. - Review workpiece shape and contact area
Irregular castings, forged blanks, long shafts and thin parts often require a special contact structure or compensating jaw layout. - Confirm spindle nose and cylinder data
Provide spindle nose, through-hole size, drawbar thread, drawbar stroke and rotary cylinder data before selecting the chuck.
Quick Selection Table
| Requirement | Start with |
|---|---|
| Need axial pull-down or length control | Pull-Back Hydraulic Chuck |
| Long shaft or center-supported workpiece | Ball-Joint Hydraulic Chuck |
| Irregular casting or out-of-round blank | Compensating Hydraulic Chuck with Floating Jaws |
| End-face clamping or limited outside-diameter access | Finger / Face-Clamping Chuck |
| Oil pipe or tube thread machining | Oil Pipe Thread Chuck |
| Standard round workpiece production | Hydraulic Chucks |
FAQ
What is the difference between a special hydraulic chuck and a standard hydraulic chuck?
A standard hydraulic chuck is usually selected by jaw number, through-hole size and clamping range. A special hydraulic chuck solves a specific workholding problem, such as pull-back location, floating compensation, face clamping, pipe-thread machining or long-shaft support.
Are pull-back chucks and draw-down chucks the same type of solution?
They are often used to describe similar axial seating concepts. The exact structure should be confirmed by the chuck drawing, drawbar stroke and locating method.
When should I use a compensating chuck?
A compensating chuck is used when the workpiece surface is uneven, irregular or out of round. The floating jaw mechanism helps the jaws adapt to the workpiece surface.
Is this the same as a floating-jaw chuck?
Some suppliers may describe this type of workholding as a floating-jaw chuck. On this page, we use “compensating hydraulic chuck with floating jaws” to describe the structure more clearly: the jaws can adapt to uneven or irregular workpiece surfaces during clamping.
What is a finger chuck used for?
A finger chuck is used when the part must be held by limited contact points or by the end face, especially when outside-diameter clamping causes interference.
What information should I send for special hydraulic chuck selection?
Send the workpiece drawing, material, clamping surface, locating method, spindle nose, through-hole requirement, drawbar stroke, rotary cylinder force and machining process.