OpeningYour drawing defines the part. We machine it exactly to your print, then verify every critical dimension before shipment. No surprises on your spindle.This is a precision ma
OpeningYour drawing defines the part. We machine it exactly to your print, then verify every critical dimension before shipment. No surprises on your spindle.This is a precision manufacturing product
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Send us your drawing / quantity / material — reply within 24h.
Your drawing defines the part. We machine it exactly to your print, then verify every critical dimension before shipment. No surprises on your spindle.
This is a precision manufacturing product for engineers who need repeatable runout and secure tool clamping. We build ER32 spring collet chucks from solid steel or alloy, with a ground taper and hardened nut threads.
Runout: ≤ 0.005 mm at the nose (TIR)
Material: 20CrMnTi or 42CrMo, hardened to HRC 58–62
Lead time: 15–20 days for standard batches
No MOQ — order one piece or one thousand
Made in China, inspected per batch, shipped with a report
Specifications
Parameter
Value
Collet type
ER32 (compatible with standard ER32 collets)
Shank options
Straight (16/20/25 mm), CAT40, BT40, or custom
Material
20CrMnTi (case-hardened), 42CrMo (through-hardened), or 17-4PH stainless
Hardness
Core HRC 38–42, surface HRC 58–62
Machining process
CNC turning, CNC milling, then cylindrical grinding
Taper accuracy
Ground to AT3 or better
Runout (TIR)
≤ 0.005 mm at nose, ≤ 0.010 mm at 100 mm from nose
Surface finish
Ra 0.4 µm on taper, Ra 0.8 µm on body
Thread
M12 x 1.5 or custom, cut or rolled
Balance
G2.5 at 20,000 RPM (optional)
Coating
Black oxide, TiN, or none (as per drawing)
Inspection
100% critical dimensions, CMM report per batch
Batch size
1–10,000 pieces, no MOQ
We use 5-axis CNC mills and CNC lathes from Mazak and Doosan. Grinding is done on Studer cylindrical grinders. Every chuck is deburred, cleaned, and oiled before packing.
Three reasons buyers send us their drawings
1. Batch-traceable quality.
Each batch gets a unique heat number and production lot code. We keep records for 5 years. If you have a field failure, we can trace the material certificate, machine operator, and inspection data for that specific batch.
2. Inspection report per batch.
You get a dimensional report with actual measured values, not just a pass/fail sheet. We measure taper angle, runout, hardness, and thread pitch. The report is signed by our QC engineer and sent with the shipment.
3. One factory for CNC + stamping + springs + heat sinks.
Your collet chuck might need a spring, a stamped retainer, or a heat sink for a thermal test. We make all of them under one roof. You save logistics cost, avoid tolerance mismatches between suppliers, and get one point of contact for quality.
Where these parts are used
CNC milling machines — holding ER32 collets for end mills, drills, and reamers
CNC lathes — live tooling holders and static boring bar holders
Automotive production lines — high-volume drilling and tapping stations
Aerospace fixtures — custom shanks for non-standard spindle interfaces
Medical device machining — where runout below 0.005 mm is required for small-diameter tools
Prototype shops — quick-change tooling for short runs
Buyers typically send us a drawing when they need a custom shank length, a special thread, or a hardened version of a standard chuck. We also make double-angle collet chucks for high-torque applications.
Q: What is your MOQ?
A: No MOQ. We accept one-piece orders for prototypes and small batches. The unit price drops with quantity, but we don’t force you to buy more than you need.
Q: How do you guarantee tolerance and quality?
A: We grind the taper and nose after heat treatment. Runout is measured on a precision mandrel with a dial indicator. Every batch includes a CMM report. If a part fails your incoming inspection, we replace it at our cost.
Q: What is your lead time?
A: Standard ER32 chucks: 15–20 days. Custom shanks or special materials: 20–25 days. We can expedite to 10 days for urgent orders, subject to material availability.
Q: Do you provide material certificates?
A: Yes. We supply EN 10204 3.1 material certificates for steel and stainless. Hardness test reports and coating thickness certificates are available on request.
Send your drawing
Get a firm quote within 12 hours. We review your material, tolerance, and quantity, then send a price and delivery date. No obligation.
Email: sc@bquq.com
WhatsApp: +86 13713157787
Send us your PDF or STEP file. We’ll confirm manufacturability and suggest cost reductions if we see them.
