4K Four-Jaw Hollow Power Chuck
The 4K is a four-jaw hollow power chuck, built for shops that need power clamping on work that is not round. Four jaws close together under hydraulic pressure, so square, rectangular and irregular parts are held securely inside an automatic cycle instead of being set by hand in an independent chuck. The hollow body let...
What This Machine Does
The 4K is a four-jaw hollow power chuck, built for shops that need power clamping on work that is not round. Four jaws close together under hydraulic pressure, so square, rectangular and irregular parts are held securely inside an automatic cycle instead of being set by hand in an independent chuck. The hollow body lets bar and tube pass through the spindle, so long stock can still be fed on a machine equipped for it. Clamping force is high and repeat positioning accuracy is close, which is what keeps the part in the same place cycle after cycle and lets tool offsets hold through a batch. The chuck is stable at high speed and built for continuous running. Sizes run from 4K-06 with a 169mm body through 4K-08, 4K-10, 4K-12 and 4K-15 to 4K-18 at 450mm, with mountings from A5 to A11 to match the lathe spindle nose.
Why Buyers Choose This Machine
- Four jaws under power clamping hold irregular and square parts inside an automatic cycle
- Hollow body allows bar and tube to pass through the spindle
- High clamping force grips securely without crushing thin-walled parts at three points
- High repeat positioning accuracy keeps tool offsets valid across a production batch
- Stable at high speed so workholding does not limit the spindle speed you can run
- Sizes from 4K-06 at 169mm to 4K-18 at 450mm with A5 to A11 mountings
Where 4K Four-Jaw Hollow Power Chuck Earns Its Place
Problems It Solves
- Self-centring three-jaw chucks cannot grip square or irregular parts securely
- Independent four-jaw chucks are set by hand which rules out automatic cycles
- Three-point clamping pulls thin-walled rings out of round
- Manual clamping force varies between operators and shifts
- Loss of repeat position between cycles means resetting tool offsets
Who It Is For
- CNC turning shops running non-round production parts
- Manufacturers machining castings in repeat batches
- Machine tool rebuilders and integrators fitting power workholding
- Distributors supplying chucks to production machine shops
Application Scenarios
- Production turning of square and rectangular components
- Holding irregular shaped castings and forgings in repeat batches
- Thin-walled ring and tube work needing four-point support
- Automatic and unattended machining cycles on non-round parts
- Second operation work where part position must repeat between cycles
Technical Detail
Technical Features
- Four-jaw hollow hydraulic power chuck
- Specially suited for irregular shaped workpieces
- High speed stability
- High accuracy of repeat positioning
- Large clamping force
- Strong and durable construction
- Through bore machined to H6 tolerance
- Mounting sizes A5 A6 A8 and A11 across the range
Specifications
| Machine type | Four-jaw hollow hydraulic power chuck |
|---|---|
| Models | 4K-06 4K-08 4K-10 4K-12 4K-15 4K-18 |
| Body diameter A | 169mm 4K-06 210mm 4K-08 254mm 4K-10 304mm 4K-12 381mm 4K-15 450mm 4K-18 |
| Mounting | A5 A6 A8 and A11 according to model |
| Body height B | 81mm 4K-06 91mm 4K-08 100mm 4K-10 110mm 4K-12 133mm 4K-15 |
| Through bore C | 91mm 4K-06 103mm to 109mm 4K-08 113mm to 120mm 4K-10 122mm 4K-12 149mm to 160mm 4K-15 in H6 |
| Jaw count | Four jaws |
| Application | Power clamping of irregular shaped workpieces |
Figures above are taken from the product information we hold. Send us your application and we will confirm the exact specification for the model quoted.
How It Is Built and What Can Be Changed
Operations Performed
- Turning
- Boring
- Facing
Quality Control
- Through bore machined and checked to H6 tolerance
- Jaw repeat positioning accuracy verified on assembly
- Clamping force checked on the assembled chuck
- Mounting face and register run-out checked
- Chuck run at speed to confirm stability before packing
Customisation Options
- Chuck size selected from 4K-06 to 4K-18 by part size
- Mounting specified for your spindle nose from A5 to A11
- Soft or hard jaws quoted and shaped for your workpieces
- Draw tube adapter specified for your machine cylinder
How It Compares With the Alternatives
| 3K three-jaw hollow power chuck | The 3K self-centres on round stock and loads faster; the 4K takes square and irregular work that a three-jaw chuck cannot hold safely |
|---|---|
| K72 four-jaw independent chuck | The K72 is set jaw by jaw for one-off and eccentric work; the 4K clamps all four jaws under power and repeats position for production batches |
| Clamping on a faceplate or fixture | A dedicated fixture holds one part well but has to be made and set; the 4K handles a range of irregular parts with soft jaws shaped to the work |
Running the Machine
Step 1
Check the part size and any bar diameter against the chuck bore
Step 2
Mount the chuck to the matching spindle nose and check run-out on the register
Step 3
Connect the draw tube to the machine cylinder and set clamping pressure
Step 4
Shape soft jaws to the part profile so the clamping load is spread over the faces
Step 5
Clamp a test part and check repeat position across several clamping cycles
Step 6
Grease the jaw slots and wedge mechanism to the maintenance schedule
Step 7
Recheck the clamping pressure after any jaw or part change
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Questions About 4K Four-Jaw Hollow Power Chuck
Which 4K size do I need?
Choose by part size and spindle nose. Body diameters run from 169mm on the 4K-06 to 450mm on the 4K-18. Send us your lathe model and a part drawing and we will confirm.
Will the 4K fit my lathe?
Mountings cover A5, A6, A8 and A11 across the range. Tell us your spindle nose designation and we will match the chuck.
Why choose four jaws over three?
Four jaws are specially suited to irregular shapes and spread the clamping load over four faces, which matters on square parts and on thin-walled work that would distort at three points.
Can I still feed bar through it?
Yes, within the through bore of the size you choose. Check the bore figure for your model against the bar diameter you intend to feed.
What clamping force can I expect?
It depends on the chuck size and the draw bar pull from your machine cylinder. Send us the size and your cylinder data and we will confirm the working figures.
Are soft jaws available?
Yes. Tell us the parts you hold and we will quote soft or hard jaws with the chuck.
What are your trade and payment terms?
FOB CFR and CIF. Payment is 30 percent by T/T on order and 70 percent before shipment, or an irrevocable L/C at sight.
Request a Quote on the 4K Four-Jaw Hollow Power Chuck
Send us the work you need it to do, the voltage on your site and the port you ship to. We will come back with the model, the tooling and the lead time.