OpeningYour drawing defines the tolerances. Our job is to hit them exactly. We machine your ER50 spring collet chuck and collet nut from solid bar stock, not from cast blanks with hidden porosity. Eve
Your drawing defines the tolerances. Our job is to hit them exactly. We machine your ER50 spring collet chuck and collet nut from solid bar stock, not from cast blanks with hidden porosity. Every thread is cut, every taper is ground, and every concentricity is verified before the part leaves our floor.
We do not ship parts we would not mount on our own spindles. If the print says it, we measure it. If the print does not say it, we ask first.
| Parameter | Value |
|---|---|
| Material options | 20CrMnTi (case-hardened), 42CrMo (quenched & tempered), 9Cr18 (stainless) |
| Hardness | 58–62 HRC case depth 0.8–1.2 mm (alloy steel) |
| Machining process | CNC turning, CNC milling, internal grinding, thread grinding |
| Concentricity (taper to bore) | ≤ 0.005 mm TIR |
| Runout at 3×D from nose | ≤ 0.010 mm TIR |
| Thread class | 6H (nut), 6g (chuck body) |
| Surface finish | Ra 0.4 µm on critical taper, Ra 0.8 µm elsewhere |
| Keyway / drive slots | Wire-cut, ±0.01 mm |
| Balancing | Optional G2.5 at 20,000 RPM (dynamic balance report available) |
| Batch size | 1 to 10,000 pieces |
| Inspection | 100% critical dimensions, CMM report per batch |
| Country of origin | Made in China, Dongguan factory |
We use Mazak and Doosan CNC lathes with live tooling for the body, then finish the taper on a Studer internal grinder. Threads are cut on a CNC thread grinder, not chased with a die. This is the difference between a collet chuck that grips true and one that wobbles.
1. Batch-traceable quality Each batch gets a unique heat number and work order. We record material certs, machine settings, and operator initials. If a problem appears in your assembly line six months later, we can trace it back to the exact shift and tool insert. You cannot do that with a trading company.
2. Inspection report per batch You get a dimensional report with every shipment. It lists measured values for taper angle, thread pitch, concentricity, and hardness. We do not just say "it is within tolerance." We show you the numbers. For critical aerospace or medical runs, we include CMM point-cloud data on request.
3. One factory for CNC + stamping + springs + heatsinks Your collet chuck is not an island. It works with a drawbar spring, a stamped retainer plate, or a heatsink in a high-speed spindle housing. We make all of those in the same building. You send one drawing package, we coordinate the processes, and you receive one consolidated shipment. Fewer vendors, fewer excuses, fewer delays.
Our custom CNC collet chucks are running in production environments that punish cheap tooling:
If your application involves gripping round stock, pushing coolant through the bore, or spinning at 10,000+ RPM, this is the part.
Looking for a different part? We also machine Custom CNC Machined ER20 Collet Chuck with Carbide End Mill in the same Dongguan factory.
Q: What is your MOQ? A: No MOQ. We machine one prototype for you to test, then scale to 5,000 pieces when you are confident. The per-piece price drops with quantity, but the quality process does not change.
Q: How do you guarantee tolerance and quality? A: We grind the taper and bore on the same setup to eliminate stacking errors. Every chuck is checked on a Marposs gauge for taper angle and concentricity. We send the inspection report with the shipment. If any dimension is out, we replace the part at our cost.
Q: What is the lead time? A: Standard custom batch is 15-20 working days from drawing approval. If you need a sample for fit testing, we can rush one in 7 days. Production repeat orders are faster because we keep your tooling and program files on file.
Q: Can you provide material certificates? A: Yes. We supply mill test certificates for the raw material, heat treatment reports, and hardness test results. For stainless or high-alloy steel, we can also provide a chemical composition analysis from an independent lab.
Stop guessing if a standard catalog chuck will fit your spindle. Send us your drawing and we will tell you exactly what we can hold, what it costs, and when you will have it.
Email your PDF or STEP file to sc@bquq.com Or message us directly on WhatsApp: +86 13713157787
Precision manufacturing is not a slogan. It is a measurement. Send us the drawing and we will prove it.
| 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 |
