OpeningYour drawing defines the part. We machine it. Every ER40 spring collet chuck is made to your exact geometry, heat treatment, and runout spec. Before shipment, each unit is c
Precision ER40 Spring Collet Chuck CNC Lathe Custom Made in China
OpeningYour drawing defines the part. We machine it. Every ER40 spring collet chuck is made to your exact geometry, heat treatment, and runout spec. Before shipment, each unit is checked on a calibrat
Get a Fast Quote for This Part
Send us your drawing / quantity / material — reply within 24h.
Your drawing defines the part. We machine it. Every ER40 spring collet chuck is made to your exact geometry, heat treatment, and runout spec. Before shipment, each unit is checked on a calibrated test arbor. Runout is verified, not assumed.
Tolerance: 0.005 mm on OD and taper
Runout: ≤ 0.008 mm TIR at nose
Material: 20CrMnTi or 8620, case-hardened to 58–62 HRC
Lead time: 15–20 working days for custom batches
No MOQ: order 1 piece or 1,000 pieces
We are a precision manufacturing factory in Dongguan, China, with 20 years of CNC machining experience. You send the drawing. We return a firm quote and a part that fits your spindle.
Specifications
Parameter
Value
Material options
20CrMnTi, 8620, 42CrMo, 9Cr18
Hardness
Case-hardened 58–62 HRC, core 30–40 HRC
Taper accuracy
AT3 per DIN 55026 or better
Runout (TIR)
≤ 0.008 mm at nose, ≤ 0.005 mm at 10 mm from nose
Surface finish
Ra 0.4 µm on taper, Ra 0.8 µm on OD
Keyway / drive slots
Milled or wire-cut, ± 0.01 mm
Threads
M16, M20, or custom per drawing
Slots
6-slot or 8-slot, width ± 0.02 mm
Balancing
G2.5 or better for high-speed use
Process
CNC turning, grinding, wire EDM, heat treatment
Inspection
100% dimensional check, CMM report per batch
Batch size
1 to 5,000 pieces, no MOQ
Lead time
15 days for prototypes, 20 days for production
All custom CNC collet chucks are machined from solid bar or forged blank, then ground on the taper and bore. Heat treatment is done in-house with batch tracking. Hardness is tested on every batch, not every tenth part.
Three reasons buyers send us their drawings
1. Batch-traceable quality.
Each heat lot gets a unique code. We record material cert, heat treatment curve, and final inspection data. If a problem appears in your line, we trace it to the exact batch and date. No guesswork.
2. Inspection report per batch.
You get a dimensional report for every batch, not a sample. CMM data for taper angle, runout, and slot width. Hardness test results. Material certs from the mill. This is standard, not an extra-cost option.
3. One factory for CNC + stamping + springs + heat sinks.
Your collet chuck is not the only part you buy. If your assembly also needs a spring, a stamped retainer, or a heat sink, we make them under one roof. Fewer suppliers, fewer logistics headaches, one quality standard.
Where these parts are used
ER40 spring collet chucks are not just for toolholders. Our customers use them in:
CNC lathes and turning centers – bar work, secondary operations, and short-run precision parts.
Swiss-type machines – where runout and concentricity directly affect part quality.
Grinding machines – holding cylindrical workpieces for OD or ID grinding.
Rotary transfer machines – high-volume production of small metal components.
Automotive and aerospace – valve stems, fuel injector bodies, and hydraulic fittings.
Medical device manufacturing – small titanium and stainless steel parts requiring repeatable clamping.
In every case, the chuck is the last thing between your spindle and your part. If it is off by a micron, your part is off by a micron. We do not let that happen.
Q: Is there really no MOQ?
A: Yes, no MOQ. We machine one prototype for testing or 5,000 pieces for production. The unit price for one piece is higher, but the quality standard is identical.
Q: What tolerance and runout can you guarantee?
A: Standard is 0.005 mm on taper and 0.008 mm TIR at the nose. For high-precision jobs, we can hold 0.003 mm on taper and 0.005 mm TIR. This is verified on a test arbor before shipment.
Q: What is the lead time for a custom collet chuck?
A: 15 working days for prototypes, 20 working days for production batches. If you need faster, we can split the batch and ship the first part in 10 days.
Q: Do you provide material certificates?
A: Yes. Every batch comes with mill test certificates, heat treatment reports, and hardness test data. We keep records for 5 years.
Send your drawing
Send us your PDF, STEP, or IGES file. We will check the geometry, confirm the material, and give you a firm quote within 12 hours. No vague estimates. No hidden costs.
Email: sc@bquq.com
WhatsApp: +86 13713157787
Your custom CNC collet chuck, made in China, machined to your drawing, verified before shipment. No MOQ, no excuses.
