Product details
## Opening
This is a 25-type triangle bore spring collet, machined to your drawing. We do not sell off-the-shelf approximations. We cut, heat-treat, and grind each collet to the exact bore geometry, taper angle, and slot pattern you specify. Every unit is verified before shipment. If the drawing is correct, the collet is correct.
- Tolerance: ±0.005 mm on bore diameter, ±0.01 mm on taper
- Lead time: 7–12 working days for standard steel, 15 days for hardened
- No MOQ – order one piece or one thousand
- Material: 20CrMnTi, GCr15, or 65Mn per your spec
| ## Specifications |
|---|
| Parameter | Value |
|---|
| Material options | 20CrMnTi (carburized), GCr15 (bearing steel), 65Mn (spring steel) |
| Hardness | 58–62 HRC (case-hardened), 45–50 HRC (through-hardened) |
| Bore shape | Triangle (3-point), custom angles 60°–120° |
| Bore diameter range | 3 mm – 25 mm |
| Taper angle | 30° standard, custom per drawing |
| Tolerance | ±0.005 mm bore, ±0.01 mm taper, ±0.02 mm slot width |
| Surface finish | Ra 0.4 on bore, Ra 0.8 on outer taper |
| Slot pattern | 3-slot or 6-slot, EDM wire-cut |
| Process | CNC turning, milling, heat treatment, cylindrical grinding, wire EDM |
| Inspection | 100% dimensional check, bore gauge + CMM on request |
| Batch size | 1 – 10,000 pieces |
| Lead time | 7 working days (soft), 12 working days (hardened) |
| Country of origin | Made in China, Dongguan |
We run these on CNC auto lathes and Swiss-type machines. For high-volume runs, we use multi-spindle auto lathes to hold consistent cycle times. Grinding is done on cylindrical grinders with in-process gauging. Slotting is wire EDM – no burrs, no taper error.
## Three reasons buyers send us their drawings
1. Batch-traceable quality. Each batch gets a unique heat number and work order. We record material cert, heat treatment curve, and final inspection data. If a problem shows up in your assembly line, we can trace it to the exact batch and process step. No guesswork.
2. Inspection report per batch. You get a dimensional report for every batch – not a sample. We measure bore diameter, taper angle, slot width, and hardness on each piece. For critical dimensions, we include CMM data. You do not need to re-inspect on arrival.
3. One factory for CNC + stamping + spring + heatsink. Your collet is not the only part you need. We also make stampings, compression springs, and heat sinks. Send us the whole assembly drawing. We coordinate the processes internally, so you deal with one supplier, one set of paperwork, one shipping date.
## Where these parts are used
This 25-type triangle bore collet fits automatic lathes and CNC turning centers that use 25-type collet chucks. Common applications:
- Swiss-type screw machines – holding round or hex bar stock for small precision parts like watch pins, medical screws, and connector pins.
- Automatic bar feeders – clamping stock for high-volume turning of bushings, spacers, and fasteners.
- Secondary operations – holding pre-machined parts for drilling, tapping, or milling on CNC lathes.
- Spring manufacturing – collets used to feed wire into spring coiling machines, where bore accuracy directly affects coil diameter.
- Heat sink production – holding aluminum blanks for CNC milling of pin-fin heat sinks, where runout must stay under 0.01 mm.
The triangle bore design gives three-point contact. It grips hex and triangular stock without marking the surface, and it centers better than round bores on irregular cross-sections. If you machine hex bar stock, this is the collet you need.
## Questions buyers ask before ordering
Q: What is your MOQ?
A: No MOQ. We make one piece for prototypes and thousands for production. The unit price drops with quantity, but we do not force you to buy more than you need.
Q: How do you guarantee tolerance and quality?
A: We grind the bore and taper after heat treatment. Each collet is checked with a bore gauge and taper gauge. For orders over 50 pieces, we include a CMM report on 3 samples per batch. If any dimension is out of spec, we replace the batch at no cost.
Q: What is the lead time?
A: 7 working days for soft steel, 12 working days for hardened. If you need faster, we can split the batch – ship finished pieces first, rest within 3 days. We do not quote lead times we cannot meet.
Q: Can you provide material certificates?
A: Yes. We supply mill certificates for the raw material, heat treatment reports, and hardness test results. All documents are in English. We can also provide RoHS and REACH compliance if your application requires it.
## Send your drawing
Send us your drawing in PDF, STEP, or IGES format. We will review the geometry, tolerances, and material spec, then send you a firm quote within 12 hours. No hidden costs, no vague promises.
Email: sc@bquq.com
WhatsApp: +86 13713157787
Precision manufacturing is our only business. Custom CNC collet chuck, made in China, no MOQ – that is what we do. Send the drawing, and we will handle the rest.
Looking for a different part? We also machine Custom CNC Collet Chuck with Spanner Wrench Set | Precision Manufacturing in the same Dongguan factory.
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