OpeningThis is a 640 type round bore collet chuck, machined to your exact drawing. We hold the bore concentricity to 0.005 mm TIR. Every unit is verified on a CMM before shipment.
Custom CNC Collet Chuck 640 Type Auto Lathe Round Bore | BQUQ
OpeningThis is a 640 type round bore collet chuck, machined to your exact drawing. We hold the bore concentricity to 0.005 mm TIR. Every unit is verified on a CMM before shipment. No exceptions.We are
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Send us your drawing / quantity / material — reply within 24h.
This is a 640 type round bore collet chuck, machined to your exact drawing. We hold the bore concentricity to 0.005 mm TIR. Every unit is verified on a CMM before shipment. No exceptions.
We are BQUQ, a precision manufacturing factory in Dongguan, China. We have run CNC lines for 20 years. This collet chuck is a standard product for us, but we treat it as a custom part. Send us your print, and we will match your material, hardness, and geometry.
At a glance: Tolerance ±0.005 mm on bore, surface finish Ra 0.4, lead time 7–10 days, no MOQ.
Specifications
Parameter
Value
Type
640 type round bore collet chuck
Bore diameter range
3 mm – 60 mm (as per drawing)
Material options
20CrMnTi, 40Cr, 9SiCr, GCr15, 65Mn
Hardness
58–62 HRC (carburized or through-hardened)
Heat treatment
Carburizing, quenching, tempering
Bore tolerance
±0.005 mm
Concentricity (TIR)
≤ 0.005 mm
Surface finish
Ra 0.4 on bore, Ra 0.8 on outer surfaces
Slots
Wire-cut EDM, full depth, no burr
Keyway / drive slots
Milled or broached per drawing
Process
CNC turning, CNC milling, wire-cut, grinding
Inspection
100% dimensional check, CMM report per batch
Batch size
1 piece to 10,000 pieces
Lead time
7 days for prototypes, 10 days for production
MOQ
No MOQ
All material certs are available. We keep batch records for 3 years.
Three reasons buyers send us their drawings
1. Batch-traceable quality. Each lot gets a unique batch number. We record heat treatment curves, grinding wheel specs, and final inspection data. If you have a problem in your line, we can trace back to the exact heat treat furnace and operator. That is not common for collet chucks made in China.
2. Inspection report per batch. You get a dimensional report with every shipment. It lists bore diameter, TIR, surface roughness, and hardness. We do not send a generic certificate. You get real numbers from our CMM and Rockwell tester. If you need a full material certificate, we include that too.
3. One factory for CNC, stamping, springs, and heat sinks. You are not just buying a collet chuck. You are buying a supplier who can also make your spring collets, stamped washers, and heat sink plates. One purchase order, one quality system, one shipping point. That saves you time and freight cost.
Where these parts are used
The 640 type round bore collet chuck is used in automatic lathes, especially Swiss-type and sliding headstock machines. It grips round bar stock from 3 mm to 60 mm. Common applications:
High-volume turning of pins, shafts, and bushings for automotive fuel systems.
Medical device machining: bone screws, dental implants, small instrument shafts.
Electronics hardware: connector pins, standoffs, and precision spacers.
Fastener manufacturing: collets for screw blanks and rivets.
Hydraulic and pneumatic fittings where round stock needs repeatable concentric gripping.
In each case, the collet chuck must hold the bar without marking it, release quickly, and maintain grip over thousands of cycles. Our hardened and ground bore does exactly that. The wire-cut slots give even clamping force across the full length of the collet.
Q: What is your MOQ?
A: No MOQ. We make one piece for prototype validation. For production, we can run 10,000 pieces per month on our auto lathe line. You decide the quantity.
Q: How do you control tolerance and quality?
A: We machine to ±0.005 mm on the bore. After heat treatment, we grind the bore and OD. Final inspection is done on a CMM with a calibrated probe. Every piece is checked for bore diameter and TIR. We send you the report.
Q: What is your lead time for custom CNC collet chucks?
A: 7 days for a prototype, 10 days for production quantities. If you need faster, we can split the order and ship partial lots. We also keep common sizes (8 mm, 10 mm, 12 mm, 20 mm) in semi-finished stock.
Q: Do you provide material certificates?
A: Yes. We provide mill certificates for the raw material, heat treatment reports, and hardness test results. All are traceable to the batch number. If your customer requires a specific standard (ASTM, DIN, JIS), we can source that material.
Send your drawing
Send us your drawing for a firm quote. We reply within 12 hours with price, lead time, and a technical review of your part. If your drawing is incomplete, we will tell you exactly what is missing.
Email: sc@bquq.com
WhatsApp: +86 13713157787
Precision manufacturing is our only business. Custom CNC collet chuck, made in China, no MOQ, verified before shipment. Send the print.
