OpeningWe machine your ER20 spring collet chuck to your drawing, not to a stock catalog. Every chuck is verified for runout and taper fit before it leaves our floor. You send the print, we handle the
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- sc@bquq.com
OpeningWe machine your ER20 spring collet chuck to your drawing, not to a stock catalog. Every chuck is verified for runout and taper fit before it leaves our floor. You send the print, we handle the
We machine your ER20 spring collet chuck to your drawing, not to a stock catalog. Every chuck is verified for runout and taper fit before it leaves our floor. You send the print, we handle the rest.
At a glance: ER20 taper tolerance within 0.005 mm, concentricity ≤ 0.01 mm TIR, lead time 7–12 days, no MOQ, made in China.
| Parameter | Value |
|---|---|
| Material options | 20CrMnTi, 42CrMo, 65Mn, or per your drawing |
| Hardness | 58–62 HRC (carburized) or 40–45 HRC (quenched) |
| Taper accuracy | AT3 per DIN 6499, runout ≤ 0.005 mm |
| Concentricity (collet seat to taper) | ≤ 0.01 mm TIR |
| Surface finish | Ra 0.4 µm on taper, Ra 0.8 µm on body |
| Process | CNC turning, CNC milling, internal grinding, heat treatment |
| Inspection | 100% taper gauge check, 100% runout check, batch sample for CMM |
| Batch size | 1 piece to 10,000 pieces, no MOQ |
| Lead time | 7 days for prototypes, 12 days for production |
| Marking | Laser engraving per your spec (part number, date code, logo) |
We use 5-axis CNC mills and cylindrical grinders for the taper seat. Heat treatment is done in-house with a vacuum furnace for consistent hardness. Each batch gets a full dimensional report, not a sample check.
1. Batch-traceable quality. Every chuck gets a unique batch number. We keep material certificates, heat treatment records, and inspection data for 5 years. If a problem shows up in your assembly line, we trace it back to the exact heat and machine shift.
2. Inspection report per batch. You get a PDF with actual measured values for taper angle, runout, hardness, and surface finish. We do not send a generic "passed" sheet. The report shows the numbers, and you can verify them with your own gauge.
3. One factory for CNC + stamping + springs + heatsinks. Your collet chuck is not an orphan part. If your assembly needs a spring, a stamped retainer, or a heat sink for the spindle motor, we machine all of them under one roof. One purchase order, one quality system, one shipping point. No third-party coordination.
Custom CNC collet chucks with ER20 tapers are used in:
The ER20 size is common because it balances grip range (1–13 mm) with a compact body. When you pair it with a carbide end mill, the chuck's concentricity determines whether your tool cuts true or wobbles.
Looking for a different part? We also machine Custom CNC Collet Chuck Extension Bar Long Reach Precision Manufacturing in the same Dongguan factory.
Q: What is your MOQ? A: No MOQ. We make one piece for prototype validation and scale to thousands. The unit price drops as quantity increases, but the quality standard stays the same.
Q: How do you guarantee taper and runout tolerance? A: We grind the taper after heat treatment, not before. Then we check every chuck with a calibrated taper gauge and a dial indicator at the collet seat. The inspection report lists the actual measured runout, typically under 0.01 mm TIR.
Q: What is the lead time for a custom design? A: 7 days for a prototype after drawing approval. Production batches take 12 days. If you need faster, tell us your deadline and we will schedule your job on the right machine.
Q: Do you provide material certificates? A: Yes. Every batch comes with a mill certificate for the raw material, heat treatment report, and our dimensional inspection report. All documents are in English and traceable to the batch number.
Email your PDF or STEP file to sc@bquq.com. We reply with a firm quote within 12 hours, including unit price, tooling cost (if any), and delivery date. For urgent questions, WhatsApp +86 13713157787. We are a precision manufacturing factory in Dongguan, China, with 20 years of CNC machining experience. Your drawing is safe with us – we sign NDAs on request.
| 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 |
