OpeningYour drawing defines the part. We machine it. Every collet is made to your exact dimensions, not a stock approximation. Before shipment, each unit is verified against your file with a CMM repor
Your drawing defines the part. We machine it. Every collet is made to your exact dimensions, not a stock approximation. Before shipment, each unit is verified against your file with a CMM report. You get a part that fits your spindle and holds your triangle bar stock without chatter.
This is a 25-type collet for auto lathes, designed for feeding triangle (hexagonal or square) bar stock. The internal profile matches your stock geometry. The external taper matches your spindle nose. We cut it, heat-treat it, and grind it in one facility.
| Parameter | Value | Notes |
|---|---|---|
| Type | 25-type auto lathe collet | Fits standard 25 mm spindle taper |
| Stock shape | Triangle, hex, square | Custom profile per drawing |
| Material | 20CrMnTi, 40Cr, or 65Mn | Case-hardened or through-hardened |
| Hardness | HRC 58–62 | Case depth 0.3–0.8 mm |
| Bore tolerance | ±0.005 mm | Ground after heat treatment |
| Slot width | ±0.01 mm | EDM wire-cut, burr-free |
| Taper angle | ±0.02° | Verified with optical comparator |
| Surface finish | Ra 0.4 µm on bore, Ra 0.8 µm on taper | No grinding burns |
| Balancing | G2.5 at 6000 rpm | Available on request |
| Batch size | 1–10,000 pieces | No MOQ, tooling cost shared |
| Inspection | 100% dimensional check | CMM report per batch |
| Lead time | 7 days prototype, 15 days production | Faster for repeat orders |
Process: CNC turning of the blank, milling the slot, heat treatment, then centerless grinding of the OD and internal grinding of the bore. We do not outsource any critical step. This keeps tolerances tight and traceability simple.
1. Batch-traceable quality. Each batch gets a unique heat number and a dimensional report. If you need to trace a part back to its raw material lot, we have the records. No mixing of batches, no guessing which heat treatment cycle a part went through. This matters when a collet fails at 8000 rpm — you want to know exactly why.
2. Inspection report per batch. You do not have to trust us. We send a CMM inspection report with every shipment. It lists bore diameter, slot width, taper angle, and hardness for each sampled unit. For critical orders, we do 100% inspection and mark each collet with a serial number. You can verify everything on your end.
3. One factory for CNC + stamping + spring + heatsink. Your collet is not the only part you need. If your assembly also uses a stamped retainer, a compression spring, or a heatsink for a motor driver, we make all of them under one roof. You get one supplier, one quality system, one shipping invoice. Fewer vendors means fewer delays and less paperwork.
Looking for a different part? We also machine Custom CNC Collet Chuck 630 Type Auto Lathe Round Bore | BQUQ in the same Dongguan factory.
Q: What is your MOQ? A: No MOQ. We make one piece for prototyping or 10,000 for production. Tooling cost is quoted separately and amortized over your order volume. For repeat orders, tooling is free after the first batch.
Q: How do you guarantee tolerance on the bore and slot? A: We grind the bore after heat treatment, not before. This removes distortion from hardening. The slot is wire-cut after grinding, so it does not affect the bore geometry. Every part is measured with a CMM and the report is included in the shipment.
Q: What is your lead time? A: Prototypes ship in 7–10 working days. Production runs of 500+ pieces ship in 15 working days. If you need faster, we can split the batch and ship partial orders. We keep common materials like 20CrMnTi in stock.
Q: Can you provide material certificates? A: Yes. We supply mill certificates for raw material, heat treatment reports, and hardness test results. For aerospace or medical applications, we can provide full traceability with batch numbers and chemical composition analysis.
Send us your PDF or STEP file. We will check the taper angle, bore profile, and slot width against our standard tooling. If we need a custom grinding wheel or wire electrode, we will tell you the cost before you commit. You get a firm quote within 12 hours.
Email: sc@bquq.com WhatsApp: +86 13713157787
Precision manufacturing, made in China, with no MOQ and verified quality. Your drawing, our machines, your parts.
| 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 |
