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 pu
Custom CNC Collet Chuck BT40 ER20 Tool Holder Precision Manufacturing Made in China
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,
Get a Fast Quote for This Part
Send us your drawing / quantity / material — reply within 24h.
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.
Specifications
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.
Three reasons buyers send us their drawings
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.
Where these parts are used
A BT40 ER20 collet chuck is a workhorse in CNC milling. You will find our parts in:
Die and mold shops – finishing electrodes and hardened steel inserts where runout directly affects surface finish.
Aerospace bracket machining – thin-wall aluminum and titanium parts that need consistent tool holding at high spindle speeds.
Automotive prototype lines – quick changeovers between ER20 collets for drilling, reaming, and light milling.
General job shops – where one machine runs many small batches and the operator needs a reliable, repeatable tool holder.
Medical device machining – small stainless parts where tool deflection and chatter are unacceptable.
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.
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.
Send your drawing
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.
Firm quote in 12 hours – we reply during working hours, China time.
No MOQ – one piece is fine.
Made in China – with the inspection data to prove it.
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.
