OpeningYour drawing defines the part. We make it exactly to that geometry, then verify it before shipment.This is a BT40 ER16 collet chuck for CNC milling. It holds ER16 collets, fits BT40 spindles, a
Your drawing defines the part. We make it exactly to that geometry, then verify it before shipment.
This is a BT40 ER16 collet chuck for CNC milling. It holds ER16 collets, fits BT40 spindles, and runs true. We machine it from your print, not from a stock catalog.
| Parameter | Value |
|---|---|
| Material | 20CrMnTi, 8620, or 42CrMo (per your spec) |
| Hardness | Case-hardened 58–62 HRC, core 30–40 HRC |
| Taper tolerance | AT3 per ISO 7388/2 (BT40) |
| Concentricity (nose) | ≤0.005 mm TIR |
| Runout (with ER16 collet) | ≤0.01 mm at 4× diameter |
| Surface finish | Ra 0.4 µm on taper, Ra 0.8 µm on body |
| Coating option | TiN, TiAlN, or black oxide (on request) |
| Key process | CNC turning, CNC milling, cylindrical grinding, centerless grinding |
| Inspection | CMM report, runout gauge test, hardness test per batch |
| Batch size | 1 to 5,000 pieces |
| Lead time | 10–15 days (prototype), 20–25 days (production) |
We grind the BT40 taper on a Junker or Studer cylindrical grinder. The ER16 collet pocket is precision bored and honed. Every unit is checked on a runout gauge before packing.
1. Batch-traceable quality. Each heat of material gets a unique lot number. We record hardness, grinding parameters, and final runout per batch. If you need to trace a failure, we can show you the exact process data for that serial number.
2. Inspection report per batch. You get a CMM report, runout certificate, and material test certificate with every shipment. No extra charge. The report shows actual measured values, not just a pass/fail stamp.
3. One factory for CNC, stamping, springs, and heat sinks. Your collet chuck is not an isolated part. If your assembly also needs a stamped cover, a compression spring, or an aluminum heat sink, we make all of them under one roof. One purchase order, one quality system, one shipping date.
BT40 ER16 collet chucks are standard in vertical machining centers and CNC milling machines. Typical applications:
The BT40 taper is common on 40-taper spindles from Mazak, Haas, Okuma, and DMG MORI. Our chuck works in any of those machines, provided the pull stud matches your drawbar. We can supply the pull stud as a separate part or integrated per your print.
Looking for a different part? We also machine Custom CNC Collet Chuck Machining | Precision Manufacturing Made in China in the same Dongguan factory.
Q: What is your MOQ? A: No MOQ. We accept single-piece orders for prototypes. Production pricing starts at 50 pieces, but you can order one piece at prototype pricing.
Q: How do you guarantee tolerance and quality? A: We grind the taper to AT3 and check concentricity on a runout gauge. Each batch gets a CMM report and hardness certificate. If a part fails your incoming inspection, we replace it at no cost.
Q: What is your lead time for a custom CNC collet chuck? A: Prototype: 10–15 working days after drawing approval. Production: 20–25 working days. For urgent orders, we can expedite to 7 days for an extra fee.
Q: Can you provide material certificates? A: Yes. We supply mill test certificates for the raw material, heat treatment reports, and final hardness test results. All documents are in English and traceable to the batch number.
Send us your PDF or STEP file. We will review the geometry, check for manufacturability, and give you a firm quote within 12 hours. No hidden costs, no vague estimates.
Email: sc@bquq.com WhatsApp: +86 13713157787
Precision manufacturing, made in China, with no MOQ and full traceability. Your drawing, our machines, verified results.
| 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 |
