OpeningYour drawing becomes a finished collet in days, not weeks. We machine it, quench it, and grind the bore to your exact print. Every unit is verified before shipment. No exceptions.Tolerance: 0.0
Your drawing becomes a finished collet in days, not weeks. We machine it, quench it, and grind the bore to your exact print. Every unit is verified before shipment. No exceptions.
This is a 25 type round bore collet, quenched for wear resistance. It fits standard auto lathe spindles. We make it from your drawing, not from a catalog.
| Parameter | Value |
|---|---|
| Material | 20CrMnTi or 65Mn (per your spec) |
| Bore diameter | 3 mm – 25 mm, ground after quenching |
| Outer diameter | 25 mm (type 25) |
| Hardness | HRC 58–62, case-hardened depth 0.8–1.2 mm |
| Tolerance (bore ID) | ±0.005 mm |
| Tolerance (OD) | ±0.01 mm |
| Surface finish | Ra 0.4 µm on bore, Ra 0.8 µm on OD |
| Slot width | 0.5–1.5 mm, wire-cut EDM |
| Process | CNC turning, milling, heat treat, centerless grinding, EDM slotting |
| Inspection | 100% bore gauge check, CMM report on request |
| Batch size | 1 to 10,000 pieces |
| Lead time | 7 days (prototype), 15 days (production) |
We use CNC lathes for the blank, then quench in a vacuum furnace to avoid decarburization. Final bore grinding is done on a jig grinder with a 0.005 mm resolution. Slots are cut after hardening to prevent distortion.
1. Batch-traceable quality. Every heat number and batch is recorded. If you need to trace a part back to its material lot, we can do that in minutes. We keep records for 5 years.
2. Inspection report per batch. You get a dimensional report with every shipment. Bore ID, OD, hardness, and slot width are all measured and documented. No surprises at your incoming QC.
3. One factory for CNC + stamping + spring + heatsink. Your collet chuck is not the only part you buy. We also make springs, stampings, and heatsinks under one roof. Fewer suppliers, fewer emails, one quality standard.
A 25 type round bore collet is a workhorse in high-volume turning. You will find it in:
In all these cases, the collet is the last thing between the raw bar and the finished part. If it fails, you scrap the whole batch. That is why we quench and grind, not just turn and ship.
Looking for a different part? We also machine Custom CNC Collet Chuck Auto Lathe Spring Round Bore Pin Slot in the same Dongguan factory.
Q: What is your MOQ? A: No MOQ. We make one piece for prototypes and scale to 10,000 pieces without changing the process. You pay a small setup fee for single units, but the per-piece price drops sharply at 100+ pieces.
Q: How do you guarantee 0.005 mm tolerance after quenching? A: We grind the bore after heat treatment, not before. The blank is turned with 0.2 mm stock left on the bore. After quenching, we grind to final size. This removes distortion from the heat treat step. Each bore is checked with an air gauge.
Q: What is your typical lead time? A: 7 working days for prototypes, 15 working days for production batches. If you need a rush, we can do 5 days for standard materials like 65Mn. We do not quote faster than we can deliver.
Q: Can you provide material certificates? A: Yes. We supply mill certificates for the raw material and our own heat treat report showing the quench temperature and hardness curve. Both are included free with every order.
Send us your PDF, STEP, or even a hand sketch. We will reply with a firm quote in 12 hours. No vague estimates.
Tell us the bore size, material, and annual quantity. We will confirm the tolerance and lead time before you commit. Precision manufacturing is our only business. Your custom CNC collet chuck is made in China, but the quality is checked to international standards. No MOQ, no minimum order hassle. Just send the drawing.
| 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 |
