OpeningYour drawing defines the part. We make it exactly to that geometry, then verify every critical dimension before the box leaves our floor. This is not a catalog product. It is a custom CNC colle
Your drawing defines the part. We make it exactly to that geometry, then verify every critical dimension before the box leaves our floor. This is not a catalog product. It is a custom CNC collet chuck machined from your spec, with a hardened dark oxide finish for wear resistance and chip shedding.
| Parameter | Value |
|---|---|
| Material options | 65Mn spring steel, GCr15 bearing steel, 20CrMnTi carburizing steel |
| Hardness | HRC 58–62 (through-hardened or case-hardened) |
| Tolerance (bore) | ±0.005 mm |
| Tolerance (taper angle) | ±0.5 arcmin |
| Surface finish | Ra 0.4 µm on bore, Ra 0.8 µm on OD |
| Surface treatment | Quenched dark (black oxide), thickness 1–3 µm |
| Machining process | CNC Swiss-type auto lathe, then centerless grind |
| Grinding allowance | 0.15–0.25 mm on bore and taper |
| Roundness | ≤0.003 mm |
| Concentricity (bore to taper) | ≤0.005 mm |
| Batch size | 1–50,000 pcs |
| Inspection equipment | CMM, optical comparator, air gauge |
| Documentation | Material cert, dimensional report, hardness report |
Every collet starts as a precision ground blank. We turn the profile on a CNC auto lathe, then grind the bore and taper on a dedicated internal grinder. The dark oxide layer is applied after hardening, which adds corrosion resistance without changing critical dimensions. For high-volume orders, we use multi-spindle autos to keep cycle times under 30 seconds per piece.
1. Batch-traceable quality. Each heat of material gets a unique lot number. That lot number follows the steel from the incoming inspection to the final hardness test. If you ever need to trace a failed part back to its raw material, we can show you the exact mill cert and heat treatment curve. No guesswork.
2. Inspection report per batch. You do not have to ask for quality data. We send it automatically. Every batch ships with a dimensional report covering bore size, taper angle, roundness, and concentricity. Hardness readings from three positions on each sample are included. If you need full 100% inspection with SPC charts, we do that too—just mark it on the PO.
3. One factory for CNC, stamping, springs, and heat sinks. Your collet chuck does not exist in isolation. It sits in a spindle, often with a spring pusher or a stamped retainer. We make all of those parts under one roof. That means one purchase order, one shipping date, one quality standard. You avoid the headache of coordinating three suppliers who do not talk to each other.
Custom CNC collet chucks from this series are specified for high-speed, high-precision workholding in:
The quenched dark finish is not cosmetic. It reduces friction between the collet and the spindle taper, which prevents seizure during high-speed indexing. It also sheds coolant and chips better than a plain ground surface, extending the life of your spindle nose.
Looking for a different part? We also machine Custom CNC Collet Chuck Auto Lathe 60 Type Round Bore in the same Dongguan factory.
Q: Is there really no MOQ? A: Yes, no MOQ. We regularly ship single prototype pieces for fit testing. The price per piece is higher for one-off orders because setup and inspection time dominate. But if you send us a drawing, we will quote it honestly—whether you need one piece or fifty thousand.
Q: How do you guarantee tolerance on a custom collet? A: We machine to your drawing, but we also check the part against the actual spindle taper you specify. If you give us the taper angle and the mating part number, we verify our bore and taper with an air gauge and a CMM. The inspection report shows the measured values, not just a pass/fail stamp.
Q: What is your typical lead time? A: For a standard material like GCr15 with a dark oxide finish, prototypes ship in 7–12 working days. Production runs of 500+ pieces take 15–20 working days. If you need faster, we can expedite with a 3-day prototype service at a 20% surcharge.
Q: Do you provide material certificates? A: Yes. Every batch includes a mill certificate for the raw steel, plus our own hardness and chemical composition test results. For aerospace or medical orders, we can provide full traceability documentation with lot numbers and heat treatment records.
Stop comparing quotes from suppliers who cannot hold a tenth. Send us your part drawing and we will respond with a firm price and lead time within 12 hours. We are a precision manufacturing factory in Dongguan, China, with 20 years of experience in CNC machining, stamping, springs, and heat sinks. Custom CNC collet chucks are our daily work, not a side project.
Email your drawing to sc@bquq.com WhatsApp: +86 13713157787 We reply within 12 hours, Monday to Saturday, China time.
| 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 |
