OpeningYour BT40 ER20 collet chuck starts as a drawing. It ends as a verified tool holder with a runout of 0.005 mm or better. We machine each unit to your exact taper angle and pull-back dimensions,
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OpeningYour BT40 ER20 collet chuck starts as a drawing. It ends as a verified tool holder with a runout of 0.005 mm or better. We machine each unit to your exact taper angle and pull-back dimensions,
Your BT40 ER20 collet chuck starts as a drawing. It ends as a verified tool holder with a runout of 0.005 mm or better. We machine each unit to your exact taper angle and pull-back dimensions, then check it on a CMM before it leaves our Dongguan floor.
At a glance: BT40 taper, ER20 collet seat, runout ≤ 0.005 mm TIR, hardness HRC 58-60, lead time 7-12 days, no MOQ. Precision manufacturing, not off-the-shelf approximation.
We do not buy blanks and re-brand them. We turn, mill, grind, and nitride in-house. The table below shows what you can expect when you send us your drawing.
| Parameter | Value |
|---|---|
| Material | 20CrMnTi or 8620 steel (per drawing) |
| Taper | BT40 (MAS BT-403) |
| Collet seat | ER20, tolerance ISO 15488 |
| Runout (TIR) | ≤ 0.005 mm at nose |
| Hardness | HRC 58-60 case hardened, 0.8-1.2 mm depth |
| Surface finish | Ra 0.4 µm on taper, Ra 0.8 µm elsewhere |
| Balancing | G2.5 at 15,000 rpm (optional G1.0) |
| Keyway / drive slots | Milled to drawing, ±0.01 mm |
| Inspection | 100% CMM report per batch |
| Lead time | 7 days for prototypes, 12 days for production |
| MOQ | No MOQ. One piece or one thousand |
| Origin | Made in China, Dongguan factory |
Every custom CNC collet chuck is deburred, cleaned, and anti-rust treated before packing. We do not ship chips or grinding dust inside the taper.
1. Batch-traceable quality. Each heat number and batch gets a unique code. If you find an issue six months later, we can trace it back to the machine, the operator, and the raw material cert. No guesswork.
2. Inspection report per batch. You do not have to ask for it. Every shipment includes a dimensional report with CMM data for the taper angle, collet seat diameter, and runout. We also include hardness test results. If a dimension is out, we do not ship it.
3. One factory for CNC, stamping, springs, and heat sinks. Your collet chuck is not an isolated part. If your assembly needs a stamped cover, a compression spring, or a heat sink for the spindle motor, we make those too. One purchase order, one shipping point, one responsible supplier. That is precision manufacturing without the supply chain headache.
A BT40 ER20 collet chuck is a workhorse in CNC milling. You will find our parts in:
The ER20 collet range covers 1 mm to 13 mm tool shanks. That makes this holder suitable for both micro-drilling and moderate roughing. If your spindle is BT40 and your tools are under 13 mm, this is the interface you need.
Looking for a different part? We also machine Custom CNC Machined ER16 Collet Chuck & Nut | Precision Made in China in the same Dongguan factory.
What is your MOQ? No MOQ. We make one custom CNC collet chuck for a prototype or 500 pieces for a production line. The price per piece drops with quantity, but the quality standard stays the same.
What tolerance and runout can you hold? Standard runout is 0.005 mm TIR at the nose. If your drawing calls for 0.003 mm, we can grind it, but we will confirm the price and lead time first. Taper angle is checked with a precision air gauge, not a go/no-go plug.
What is your lead time? 7 days for a prototype or small batch. 12 days for production quantities. If you need it faster, tell us when you send the drawing. We will tell you honestly if it is possible.
Do you provide material certificates and inspection reports? Yes. Every batch includes a material certificate (mill cert) and a dimensional inspection report. Hardness test data is included. If your customer requires a full PPAP, we can provide that for production orders.
Stop adapting your design to a catalog part. Send us your drawing and get a firm quote for a custom CNC collet chuck that meets your taper, runout, and hardness requirements.
Email your drawing to sc@bquq.com or message us on WhatsApp at +86 13713157787. We will review the geometry, confirm the material, and send you a price and lead 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 |
