OpeningYour drawing becomes a finished collet in days, not weeks. We machine it to your exact dimensions, then verify every critical feature before shipment. No surprises at your incoming inspection.T
Your drawing becomes a finished collet in days, not weeks. We machine it to your exact dimensions, then verify every critical feature before shipment. No surprises at your incoming inspection.
This is a 28 type collet for automatic lathes with round bar stock. It grips 3–28 mm bar, holds concentricity within 0.01 mm TIR, and repeats within 0.005 mm. We make it from solid bar, not castings, so grain structure stays dense and predictable.
| Parameter | Value |
|---|---|
| Type | 28 type (DIN 6343 compatible) |
| Bar stock range | 3–28 mm round |
| Material options | 20CrMnTi, 40Cr, 9SiCr, 65Mn |
| Hardness | 58–62 HRC case-hardened |
| Bore tolerance | +0.005 / 0 mm |
| Taper tolerance | ±0.005 mm (mating angle 30°) |
| Concentricity (TIR) | ≤0.01 mm |
| Surface finish | Ra 0.4 µm on bore, Ra 0.8 µm on body |
| Slots | Wire-cut, burr-free, full depth |
| Heat treatment | Carburized or induction hardened |
| Batch size | 1–10,000 pieces |
| Inspection | 100% critical dimension check per batch |
| Lead time | 7–12 working days (standard) |
We run these on Citizen and Star Swiss-type lathes for the body, then wire-cut the slots in-house. Hard turning and grinding happen on the same line, so you get one source of truth for geometry.
1. Batch-traceable quality. Every collet gets a unique batch number. We record material heat number, heat treatment furnace log, and final inspection data for that batch. If you ever need to trace a problem, you have the full chain in one PDF.
2. Inspection report per batch. You do not have to trust us. Each shipment includes a dimensional report with actual measured values for bore, taper, concentricity, and hardness. We use a CMM and a hardness tester calibrated every quarter. The report is signed by the QC lead, not a machine.
3. One factory for CNC + stamping + spring + heatsink. Your collet is often part of a larger assembly. We machine the collet, stamp the retainer plate, wind the return spring, and cut the heatsink for the spindle motor—all under one roof. Fewer vendors, less logistics, faster root-cause analysis when something goes wrong.
In each case, the collet is the last thing between the spindle and the part. If it wobbles, your part wobbles. That is why we hold TIR to 0.01 mm and check it on every piece.
Looking for a different part? We also machine Custom CNC Collet Chuck Set 36 46 Type Precision Made in China in the same Dongguan factory.
Q: What is your MOQ? A: No MOQ. We make one piece for a prototype or 10,000 for production. The unit price drops with quantity, but the first piece is never a penalty.
Q: How do you guarantee tolerance and quality? A: We cut the bore and taper on a CNC grinder with in-process gauging. After heat treatment, we re-grind to final size. Each collet is measured on a CMM, and the report ships with the batch. If a dimension is out, we scrap it—we do not rework and ship.
Q: What is your lead time for a custom collet? A: Standard materials (20CrMnTi, 40Cr) ship in 7–12 working days. If you need a hardened collet with special slot geometry, add 3–5 days for wire-cutting and inspection. Rush orders are possible—call us to check current capacity.
Q: Do you provide material certificates? A: Yes. Every batch comes with a mill certificate for the raw bar, plus our own heat treatment report. If you need a third-party lab test (e.g., SGS), we can arrange it at cost.
Email your PDF or STEP file to sc@bquq.com. We reply with a firm quote in 12 hours—price, lead time, and a technical review of any risky dimensions.
Prefer chat? WhatsApp +86 13713157787. We answer in English, and we are awake during your working hours.
Your drawing is safe with us. We sign NDA on request, and we never share your part geometry with anyone.
Send it now. Get a quote today.
| 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 |
