OpeningThis is a precision-machined auto lathe 20-type spring collet with a hex bore, made to your exact drawing. We do not stock generic blanks. Every collet is cut, heat-treated, and ground in our D
This is a precision-machined auto lathe 20-type spring collet with a hex bore, made to your exact drawing. We do not stock generic blanks. Every collet is cut, heat-treated, and ground in our Dongguan factory, then verified for bore geometry and spring tension before shipment.
If your drawing specifies a hex bore for a 20-type auto lathe spindle, we hold the internal hex to tight angular and dimensional limits. The result is a collet that grips the workpiece without deformation and releases cleanly.
At a glance: Tolerance ±0.005 mm on bore and hex, lead time 7–12 days, no MOQ, material certs included.
| Parameter | Value |
|---|---|
| Material options | 65Mn spring steel, 60Si2MnA, 9Cr18 stainless, or per drawing |
| Hardness | HRC 42–48 (spring temper), optional HRC 50–55 for wear resistance |
| Bore type | Hex, square, round, or custom profile per drawing |
| Bore tolerance | ±0.005 mm on hex across flats |
| Concentricity | ≤0.01 mm TIR to taper seat |
| Surface finish | Ra 0.4 µm on bore, Ra 0.8 µm on taper |
| Process | CNC turning, milling, wire EDM for hex, heat treatment, centerless grinding |
| Heat treatment | Oil quench + temper, batch furnace with soak time log |
| Inspection | 100% dimensional check, 5% CMM sampling per batch |
| Batch size | 1 to 10,000 pieces, no setup charge for small lots |
| Lead time | 7 days for prototype, 12 days for production batch |
| Packaging | Anti-rust oil, individual foam sleeve, export carton |
All collets are made in China under ISO 9001:2015 process control. We use the same fixtures for a 1-piece sample and a 10,000-piece run, so the first article matches the last.
1. Batch-traceable quality. Each heat treatment batch gets a unique code. We record furnace temperature curves and hardness readings for that code. If you need to trace a failure, we can show you the exact process data for your collet's batch. No mixing of batches, no lost records.
2. Inspection report per batch. You get a dimensional report with actual measured values, not just a pass/fail stamp. For hex bores, we measure across flats at three depths and report angular error. For taper seats, we check contact area with a master gauge. The report is emailed with your shipment.
3. One factory for CNC, stamping, springs, and heat sinks. Your collet chuck assembly often needs a spring, a stamped retainer, or a heat sink for the spindle motor. We run all four lines under one roof. You send us the whole assembly drawing, we coordinate the parts internally, and you receive one shipment with one set of documents. Fewer suppliers, shorter lead time, no finger-pointing.
The 20-type hex bore collet is standard for Swiss-type automatic lathes and small CNC turning centers that drive hex bar stock. Typical applications:
If your spindle uses a 20-type taper, this collet fits standard 20-type collet chucks. We can also modify the taper angle or head style per your chuck's specification.
Looking for a different part? We also machine Custom CNC Collet Chuck with Spanner Wrench Set | Precision Manufacturing in the same Dongguan factory.
Q: What is the minimum order quantity? A: No MOQ. We make one piece for prototyping at the same per-piece quality as a production run. Tooling and setup are included in the unit price, not charged separately.
Q: How do you guarantee tolerance on the hex bore? A: We cut the hex with wire EDM, then grind the bore if your drawing requires it. Every collet is checked with a calibrated hex plug gauge at three depths. The inspection report shows the actual measured values.
Q: What is the lead time for a custom collet? A: Prototype in 7 days, production batch in 12 days from drawing approval. For urgent orders, we can expedite to 5 days at a 15% surcharge.
Q: Do you provide material certificates? A: Yes. Each batch includes a mill certificate for the raw material and our heat treatment report. For aerospace or medical applications, we can provide full traceability documentation at no extra cost.
Send us your drawing in PDF, STEP, or IGES format. We will review the hex dimensions, taper angle, and material specification, then send you a firm quote within 12 hours. No obligation, no design fee for standard 20-type collets.
Email: sc@bquq.com WhatsApp: +86 13713157787
We are a precision manufacturing factory in Dongguan, China, with 20 years of experience in CNC machining, stamping, springs, and heat sinks. Your custom CNC collet chuck is made to your drawing, verified before shipment, and backed by a batch-traceable quality record.
| Parameter | Capability |
|---|---|
| Materials | AL6061/7075, SUS303/304/316, 45# steel, T2 copper, H59 brass, POM, PEEK, nylon |
| Tolerance | ±0.005mm standard, ±0.003mm on request |
| Machines | 3/4/5-axis CNC, turn-mill, Swiss lathe |
| Surface | Anodizing, nickel, zinc, passivation, sandblast, polish |
| Size Range | Max 400 x 300 x 200 mm |
| Prototype | 72 hours, no MOQ on samples |
| Inspection | Full report per batch, CMM data on request |
