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Self-Centering Workholding
Four-Jaw Floating Chuck for Irregular & Round Parts
P150 / P220 floating four-jaw chucks that find the workpiece center on their own — one hex-key turn clamps X and Y together
When the part is irregular, asymmetric, or simply round, dial-in time is usually the slowest step of the setup. The floating jaws on this chuck adapt to the part shape, locate its geometric center automatically, and clamp with evenly distributed force — no manual alignment, no indicator passes.
Compared with the two-jaw self-centering vise — the right call for prismatic blanks — this four-jaw floating chuck is built for shapes a parallel-jaw vise can't reference: castings, forgings, housings, and turned parts that need centering in both X and Y.
0.02 mm
Repeatability
40,000 N
Max Clamping Force
0–220 mm
Jaw Adjustment Range
Lead time: 15–25 days
MOQ: 1 set
Payment: T/T · L/C
ISO 9001 / 14001 / 45001
MIC Verified Supplier
Best fit
Use it when the part has no parallel faces to clamp on
Castings, forgings, housings, and round or asymmetric parts that would otherwise need slow dial-in on a conventional four-jaw chuck.
Compare first
Start with clamping range: 0–150 mm or 0–220 mm
P150 covers smaller envelopes at 30,000 N; P220 extends the range and force for larger, heavier workpieces up to 500 kg on the table.
Go next
Jump to specs, how it works, or downloads
The model matrix sizes the chuck. The clamping-sequence guide shows the X/Y self-centering action step by step.
Quick RFQ handoff
Send part shape, clamping range, and mounting plan
We confirm whether P150 or P220 fits your part family — and how the chuck should mount to your table, pallet, or zero-point base — before you spend time comparing tables.
Fast RFQ paths
Share a part photo or drawing and the rough outside dimensions so engineering can reply with the right model.
The RFQ form will prefill Four-Jaw Floating Chuck for a faster reply.
Workpiece geometry
Send part shape, outside dimensions, weight, material, and whether the clamping surfaces are rough cast or machined.
Clamping range and force
Tell us the smallest and largest parts in the family so we can confirm 0–150 mm (P150) or 0–220 mm (P220) with margin.
Mounting path
Direct T-slot mounting via the fixture mounting plate, or integration with a zero-point base for fast changeovers — include your machine model.
Key Technical SpecificationsProduct FeaturesHow Self-Centering WorksSelection & Integration GuideFAQ
Catalogue model matrix
P150 / P220 Specifications
Two body sizes cover most irregular-part work: P150 for compact parts up to 150 mm across, P220 when the family runs larger or the cuts get heavier. Both share the same floating-jaw mechanism, 20 mm clamping stroke, and 0.02 mm repeat positioning accuracy.
| Model | Item No. | Clamping force | Clamping stroke | Clamping range | Repeat accuracy | Weight |
|---|---|---|---|---|---|---|
| P150 | NT-S00P150SZ | 30,000 N | 20 mm | 0–150 mm | 0.02 mm | 21.4 kg |
| P220 | NT-S00P220SZ | 40,000 N | 20 mm | 0–220 mm | 0.02 mm | 41 kg |
Use P150 for compact parts
The lighter 21.4 kg body suits smaller machines and parts up to 150 mm across — easier to move between tables and pallets.
Use P220 for larger envelopes
0–220 mm range, 40,000 N clamping force, and up to 500 kg load capacity for bigger castings and heavier roughing.
Shared construction
Hardened stainless steel jaws and body, high-strength structure with an integrated lubrication system on both models.
How to shortlist the right size
- Measure the part family, not one part: the largest clamping diameter in the family should sit comfortably inside the range — leave margin rather than running at the limit.
- P150: compact irregular parts, lighter cuts, machines where table space and fixture weight matter.
- P220: larger castings and forgings, heavier roughing loads, and parts up to 500 kg that need the full 40,000 N.
Product Features
Self-Centering
Clamping irregular, complex, or round workpieces needs no manual alignment — the chuck locates the precise clamping center automatically and holds it with high repeat accuracy.
Adjustable Clamping Range
Floating jaw positions adjust freely to parts of different sizes and shapes. One chuck covers a mixed part family, which raises fixture utilization and cuts tooling cost.
Floating Clamping
The self-adaptive jaws distribute clamping force evenly around the part — preventing deformation, slippage, and mis-clamping on thin or uneven surfaces.
Safer, Simpler Operation
Rapid positioning and one-touch clamping remove the tedious manual correction steps, lowering operator workload and improving job safety and consistency.
How the Self-Centering Action Works
One self-centering lead screw drives the floating jaws in both X and Y. Turn it with a hex wrench and the chuck finds the part's geometric center on its own — high-precision, adaptive centering with no indicator work.
STEP 1
X-direction jaws close first
Turn the self-centering lead screw on the fixture body with the hex wrench. The X-direction floating jaws move inward until they locate and pre-clamp the part at the X-axis center.
STEP 2
Y-direction jaws follow
Keep turning the same screw. The Y-direction jaws now move inward, locate the Y-axis center, and apply pre-clamping force — completing the self-centering.
STEP 3
Final tightening
With both axes pre-clamped on center, a final turn of the wrench brings the jaws to full clamping force. The part is centered and locked in one operation.
Selection & Integration Guide
A practical checklist for fitting the floating chuck into your machines and part families — and keeping its 0.02 mm repeatability over thousands of cycles.
Need faster changeovers? Mount the chuck on a zero-point clamping plate or integrate it with a zero-point clamping system so the whole fixture swaps in under a minute.
- Part geometry first: the floating jaws handle round, square, and irregular outlines — but confirm the part offers four reachable clamping points within the jaw adjustment range.
- Range with margin: pick the model whose 0–150 mm or 0–220 mm range covers the whole family with room to spare; the 20 mm clamping stroke does the final closing, not the coarse adjustment.
- Force vs cutting plan: 30,000–40,000 N covers heavy roughing on most materials — but thin-walled parts benefit more from the even force distribution than from maximum force. Clamp to the part, not to the spec sheet.
- Mounting and referencing: the fixture mounting plate bolts to T-slot tables; for multi-machine work, put the chuck on a zero-point base so the centerline carries over between setups.
- Maintenance for repeatability: keep chips off the jaw faces and lead screw, and use the integrated lubrication system on schedule — contamination, not wear, is the usual cause of accuracy drift.
- Wrench access: plan the setup so the hex-wrench port on the fixture body stays reachable when the part is loaded — especially inside 4th-axis or trunnion environments.
Frequently Asked Questions
What is the four-jaw floating chuck, and who is it for?
It is a self-centering workholding chuck with four floating jaws that adapt to the workpiece shape. It suits shops machining irregular, asymmetric, or round parts — castings, forgings, housings — where manual dial-in on a conventional four-jaw chuck is the slowest step of every setup.
How does the self-centering action work?
A single self-centering lead screw, turned with a hex wrench, drives the floating jaws in both X and Y. The X-direction jaws close and pre-clamp first, then the Y-direction jaws follow — automatically locating the part's geometric center. A final turn brings the jaws to full clamping force.
What sizes and specifications are available?
Two catalogue models: P150 (NT-S00P150SZ) with 30,000 N clamping force, 0–150 mm clamping range, and 21.4 kg weight; and P220 (NT-S00P220SZ) with 40,000 N, 0–220 mm, and 41 kg. Both have a 20 mm clamping stroke and 0.02 mm repeat positioning accuracy.
How accurate is the repeat positioning?
Both models are specified at 0.02 mm repeat positioning accuracy. Because the jaws converge on the geometric center automatically, that accuracy holds from part to part without operator skill entering the equation.
Can it really hold irregular or asymmetric parts without deforming them?
Yes — that is the point of the floating jaws. Each jaw adapts to the surface it meets, so clamping force distributes evenly around the part instead of concentrating at two points. That prevents deformation, slippage, and mis-clamping on uneven or thin-walled surfaces.
How is the chuck mounted on the machine?
The chuck body bolts to its fixture mounting plate, which mounts to standard T-slot tables. For multi-machine or pallet workflows it can sit on a zero-point clamping plate or zero-point system, so the whole chuck swaps between machines in under a minute with the centerline preserved.
What materials and maintenance keep it accurate long-term?
The jaws and body are hardened stainless steel on a high-strength structure with an integrated lubrication system. Keep chips and coolant off the jaw faces and lead screw, lubricate on schedule, and the 0.02 mm repeatability holds over thousands of cycles.
Where can I get CAD files, and what is the typical lead time?
STEP files and 2D drawings are available on request — contact us with your model choice. Catalogue models typically ship 15–25 days after PO confirmation, and every unit ships with a factory inspection report covering repeat accuracy and clamping force.
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