OpeningYour drawing becomes a finished CNC collet chuck, verified before shipment. We check every critical dimension on our own CMM, not just a spot check. If it does not match you
Custom CNC Collet Chuck Auto Lathe 40 Type Round Bore | BQUQ
OpeningYour drawing becomes a finished CNC collet chuck, verified before shipment. We check every critical dimension on our own CMM, not just a spot check. If it does not match your print, it does not
Get a Fast Quote for This Part
Send us your drawing / quantity / material — reply within 24h.
Your drawing becomes a finished CNC collet chuck, verified before shipment. We check every critical dimension on our own CMM, not just a spot check. If it does not match your print, it does not ship.
Concentricity: ≤ 0.005 mm
Hardness: HRC 58–62
Lead time: 7–12 days for standard sizes
No MOQ – one piece or one thousand
Material certs included with every batch
This is a 40-type round bore spring collet chuck for auto lathes. It holds bar stock from 1 mm to 40 mm depending on your bore profile. We machine it from your print, with your tolerances, your material grade, your surface finish.
We run these on Citizen and Star auto lathes in-house. That means we test the collet on the same machine type you will use. No surprises when it arrives.
Three reasons buyers send us their drawings
1. Batch-traceable quality.
Every collet chuck gets a unique batch number. We record raw material heat number, heat treatment furnace log, and final inspection data. If you have a problem six months later, we can trace it back to the exact steel melt.
2. Inspection report per batch.
You get a dimensional report with every shipment. It lists bore diameter, taper angle, slot width, hardness, and concentricity. We use a Zeiss CMM and a Mitutoyo hardness tester. The report is signed by our QC engineer, not a machine.
3. One factory for CNC + stamping + springs + heat sinks.
You send us one drawing package. We handle the collet chuck, the spring that goes inside it, the stamped retainer plate, and the heat sink for your spindle drive. One purchase order, one shipping document, one quality standard. This cuts your supplier management time by at least 30%.
Where these parts are used
Our 40-type round bore spring collet chucks are used in:
Swiss-type auto lathes – holding Ø3–Ø20 mm bar stock for medical screw implants, watch pinions, and connector pins.
CNC turning centers – secondary clamping for shaft ends, valve stems, and hydraulic fittings.
Automatic screw machines – high-speed production of brass and aluminum parts where runout must stay under 0.01 mm.
Spring coiling machines – feeding wire through the bore for precision compression springs.
Heat sink production – holding aluminum round stock for CNC milling of pin-fin heat sinks.
In every case, the collet is the last thing between the spindle and the part. If it wobbles, the part is scrap. That is why we grind the bore after heat treatment, not before.
Q: What is your MOQ?
A: No MOQ. We make one prototype for you to test, then scale to your production volume. Many buyers start with 5 pieces for a trial run.
Q: How do you guarantee tolerance and quality?
A: We machine to your drawing tolerance, typically ±0.005 mm on bore and OD. After heat treatment, we grind the bore to final size. Every piece is measured, and you receive a CMM report per batch. If any dimension is out, we rework or replace at no cost.
Q: What is your lead time?
A: 7 days for prototypes, 12 days for production batches up to 1,000 pieces. For urgent orders, we can split the batch and ship the first 50 pieces in 5 days. We will confirm exact dates in our quote.
Q: Can you provide material certificates?
A: Yes. We supply mill certificates for the raw steel, heat treatment reports, and a RoHS/REACH declaration if required. All documents are in English and included with the shipment.
Send your drawing
Email your PDF or STEP file to sc@bquq.com. We reply with a firm quote in 12 hours. The quote includes unit price, tooling cost (if any), lead time, and shipping options.
Need a faster answer? WhatsApp us at +86 13713157787. Send a photo of your drawing, and we will confirm feasibility within the hour.
Precision manufacturing is not a slogan here. It is a 20-year habit in our Dongguan factory. Send us your drawing, and we will show you what that means in steel.
