OpeningThis is a CNC machined auto lathe 25 type external thread extended collet, made to your drawing. We machine it from solid stock, cut the external thread to class 6g, and verify the taper angle
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OpeningThis is a CNC machined auto lathe 25 type external thread extended collet, made to your drawing. We machine it from solid stock, cut the external thread to class 6g, and verify the taper angle
This is a CNC machined auto lathe 25 type external thread extended collet, made to your drawing. We machine it from solid stock, cut the external thread to class 6g, and verify the taper angle before shipment. Every piece is checked for runout and concentricity. No exceptions.
At a glance: Tolerance ±0.005 mm on bore and taper, surface finish Ra 0.4, lead time 7–10 working days, no MOQ. Custom CNC collet chuck, made in China, shipped with an inspection report per batch.
| Parameter | Value |
|---|---|
| Material options | 20CrMnTi (carburized), 40Cr, 65Mn, 9Cr18, SUS440C, brass, aluminum bronze |
| Hardness | 58–62 HRC (case hardened), 45–50 HRC (through hardened) |
| Thread type | External, metric or inch, class 6g (or per drawing) |
| Taper angle | 16° or 20° (or per drawing), verified with air gauge |
| Bore tolerance | H6, H7, or custom |
| Runout (TIR) | ≤ 0.005 mm at nose, ≤ 0.008 mm at 50 mm from nose |
| Surface finish | Ra 0.4 on bore and taper, Ra 0.8 elsewhere |
| Machining process | CNC turning, CNC grinding, wire EDM for slots |
| Heat treatment | Carburizing, quenching, tempering, cryogenic treatment optional |
| Inspection | 100% dimension check, 100% hardness test, taper gauge test per batch |
| Batch size | 1 piece to 100,000 pieces |
| Lead time | 7–10 working days for prototypes, 15–20 days for production |
| Packaging | Anti-rust oil, individual foam slot, export carton |
We use CNC grinding for the bore and taper after heat treatment. This gives consistent geometry. We do not skip the grinding step. If you need a special slot, keyway, or ejection hole, we cut it with wire EDM after grinding.
1. Batch-traceable quality. Each batch gets a heat number, a material lot number, and a process card. If a problem shows up in your assembly line, we trace it back to the exact heat treatment cycle and grinding wheel. You get a full traceability report with the shipment.
2. Inspection report per batch. We do not just say "we check." You receive a dimensional report with actual measured values for bore, taper, thread pitch diameter, and runout. The report is signed by the QC engineer. For critical dimensions, we include Cpk values. If you need a third-party inspection (SGS, TÜV), we arrange it at cost.
3. One factory for CNC + stamping + spring + heat sink. Your collet is not the only part. You may also need a spring for the collet closer, a stamped retainer plate, or a heat sink for the spindle motor. We make all of them under one roof. One purchase order, one quality system, one shipping date. This shortens your supply chain and reduces your inspection workload.
The 25 type external thread extended collet is used in automatic lathes (Swiss-type and sliding headstock) for gripping bar stock. Typical applications:
In all these cases, the extended nose reaches deep into the guide bushing area, reducing bar vibration and improving concentricity. The external thread lets you mount the collet directly onto the spindle nose without a separate adapter.
Looking for a different part? We also machine Custom CNC Machined Auto Lathe Collet Set 630 640 643 650 700 Jumbo | BQUQ in the same Dongguan factory.
Q: What is your MOQ? A: No MOQ. We make one piece for prototype testing. For production, we suggest ordering at least 50 pieces to amortize the grinding wheel setup, but we accept 10 pieces if that is your need.
Q: How do you control tolerance and quality? A: We grind the bore and taper after heat treatment. We measure with a bore gauge and a calibrated taper ring. Runout is checked on a precision spindle with a dial indicator. Each batch gets an inspection report. If a dimension is out of spec, the piece is scrapped, not reworked.
Q: What is your lead time? A: 7–10 working days for prototypes (1–10 pieces). 15–20 working days for production quantities. If you need faster, we can split the batch and ship the first 20% in 5 days. Air freight is on you, but we handle the booking.
Q: Do you provide material certificates? A: Yes. We provide a mill certificate for the raw material, a heat treatment certificate with hardness values, and a plating certificate if you specify plating. All certificates are in English and included in the shipment.
Send us your drawing in PDF, STEP, or IGES format. We will reply with a firm quote within 12 hours. The quote includes unit price, tooling cost (if any), lead time, and shipping options. We do not charge for quoting. We do not ask for a minimum order. We do not add hidden fees.
Email: sc@bquq.com WhatsApp: +86 13713157787
Precision manufacturing is our only business. Let us quote your custom CNC collet chuck today.
| 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 |
