OpeningYour 643 type round bore spring collet chuck is machined to your exact drawing. We verify every dimension before shipment. No guesswork, no tolerance drift.This is a precisi
Custom CNC Auto Lathe 643 Type Round Bore Spring Collet Chuck | BQUQ
OpeningYour 643 type round bore spring collet chuck is machined to your exact drawing. We verify every dimension before shipment. No guesswork, no tolerance drift.This is a precision manufacturing pro
Get a Fast Quote for This Part
Send us your drawing / quantity / material — reply within 24h.
Your 643 type round bore spring collet chuck is machined to your exact drawing. We verify every dimension before shipment. No guesswork, no tolerance drift.
This is a precision manufacturing product for auto lathe spindles. It holds round stock firmly, releases cleanly, and repeats within microns.
Tolerance: ±0.005 mm on bore and taper
Lead time: 7–12 working days for standard sizes
No MOQ — order one piece or one thousand
Material: 20CrMnTi or 65Mn, case-hardened to HRC 58–62
Made in China, inspected per batch, shipped with a report
Specifications
Parameter
Value
Type
643 type round bore spring collet chuck
Bore diameter range
Ø3 mm – Ø42 mm (custom per drawing)
Taper angle
30° (standard), custom on request
Material options
20CrMnTi, 65Mn, 9SiCr, 40CrMo
Hardness
Case-hardened HRC 58–62, core HRC 38–42
Surface finish
Ra 0.4 µm on bore, Ra 0.8 µm on taper
Concentricity (TIR)
≤0.005 mm
Repeatability
≤0.003 mm
Slit width
0.5 mm – 1.2 mm, laser-cut, burr-free
Heat treatment
Carburizing + quenching + tempering
Machining process
CNC turning, internal grinding, wire EDM slitting
Inspection
100% dimensional check, CMM report per batch
Batch size
No MOQ — from 1 pc to 10,000 pcs
Lead time
7–12 days for prototypes, 15–20 days for production
Three reasons buyers send us their drawings
1. Batch-traceable quality.
Every collet chuck gets a unique batch number. We record material heat number, heat treatment curve, and final inspection data. If a problem appears in your spindle, you can trace it back to our furnace. That is not common for custom CNC collet chuck suppliers.
2. Inspection report per batch.
You get a CMM report with every shipment. It lists bore diameter, taper angle, concentricity, and hardness. We do not send parts without data. If you need a full material certificate, it is included free.
3. One factory for CNC + stamping + springs + heat sinks.
Your collet chuck is not an isolated part. It works with springs, washers, or a heat sink in the same assembly. We make all of them under one roof. You send one drawing package, we coordinate the whole job. Fewer vendors, fewer tolerance stack-ups, faster delivery.
Where these parts are used
The 643 type round bore spring collet chuck is standard on Swiss-type auto lathes and CNC sliding-head lathes. It grips round bar stock for high-speed turning, drilling, and threading.
Real applications we have supplied:
Watch and medical pin manufacturing — holding Ø2–Ø8 mm stainless steel or titanium bars, cycle times under 10 seconds.
Automotive fuel injector nozzles — clamping Ø10–Ø20 mm hardened steel stock, concentricity critical for nozzle seat geometry.
Electronic connector pins — brass and phosphor bronze bars, requiring burr-free slits to avoid scratching plated surfaces.
Hydraulic valve spools — holding Ø25–Ø40 mm ground bars, with taper angle matched to the spindle nose for zero runout.
In each case, the collet chuck is the first point of contact with the workpiece. If it is off by a micron, the finished part is off by a micron. That is why we grind the bore and taper in one setup, on the same machine, without unclamping.
Q: What is your MOQ?
A: No MOQ. We make one prototype for your trial run, or 5,000 pieces for production. The price per piece drops with quantity, but the first piece gets the same inspection rigor.
Q: How do you guarantee tolerance and quality?
A: We use CNC grinding for the bore and taper, then measure with a CMM. Hardness is verified on a Rockwell tester. Each batch gets a report. If a dimension is out of spec, we scrap it — we do not send it.
Q: What is your lead time?
A: 7–12 working days for standard steel grades and sizes. For non-standard materials or special heat treatment, add 3–5 days. We ship by DHL or FedEx, door to door.
Q: Can you provide material certificates?
A: Yes. Every batch comes with a mill certificate for the raw material, plus our heat treatment record. If your customer requires a third-party test (SGS or BV), we arrange it at cost.
Send your drawing
Send us your 2D or 3D drawing. We will check the taper angle, bore size, and slit geometry against our standard tooling. You get a firm quote in 12 hours.
Email: sc@bquq.com
WhatsApp: +86 13713157787
No MOQ, no minimum order value. One piece or one thousand — the quote is the same speed. Made in China, verified before shipment.
