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
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.
| 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.
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.
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:
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.
Looking for a different part? We also machine Custom CNC Collet Chuck 36 Type Hex Bore Auto Lathe Parts in the same Dongguan factory.
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 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.
| 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 |
