OpeningThis is a square bore spring collet for 32-type auto lathes, machined to your exact drawing. We do not sell off-the-shelf approximations. We cut, heat treat, and grind each unit to your specifi
This is a square bore spring collet for 32-type auto lathes, machined to your exact drawing. We do not sell off-the-shelf approximations. We cut, heat treat, and grind each unit to your specified dimensions, then verify critical tolerances before shipment.
At a glance: tolerance ±0.005 mm on bore and slot width, surface finish Ra 0.4, lead time 7–12 working days, no MOQ.
| Parameter | Value |
|---|---|
| Material options | 65Mn spring steel, 60Si2MnA, 9SiCr, or per your drawing |
| Hardness | HRC 45–52 (after heat treatment) |
| Bore tolerance | ±0.005 mm on square width and corner radius |
| Slot width tolerance | ±0.01 mm |
| Concentricity | ≤0.01 mm TIR to taper seat |
| Surface finish | Ra 0.4 on bore, Ra 0.8 on outer taper |
| Process | CNC turning, milling, wire EDM slotting, heat treatment, centerless grinding |
| Batch size | 1 piece to 10,000 pieces, no MOQ |
| Inspection | 100% dimensional check on bore, slot, and taper; material cert on request |
| Lead time | 7 working days for prototypes, 10–12 days for production runs |
All collets are manufactured in our Dongguan factory. We use CNC lathes for the taper and bore, wire EDM for the slot, and a heat treatment line that gives consistent hardness across the batch. Final grinding is done on a centerless grinder to hold the outer taper concentric to the bore.
Batch-traceable quality. Every collet gets a unique batch number. We record heat treatment furnace logs, grinding wheel specs, and inspection results against that number. If you have a problem six months later, we can pull the records and tell you exactly what happened.
Inspection report per batch. You get a dimensional report for every batch, not just a sample. We measure bore width, slot width, taper angle, and hardness on each piece. The report is sent with the shipment. No surprises.
One factory for CNC + stamping + springs + heat sinks. Your collet is not a standalone part. You may also need a spring pusher, a stamped retainer, or a heat sink for the spindle motor. We make all of these under one roof. You deal with one engineer, one quality system, one shipping document. Fewer emails, fewer delays.
Square bore collets are used in automatic lathes (Swiss-type and cam-type) where the workpiece is not round. Typical applications:
In each case, the collet's job is to grip the square section firmly without deforming it, and to release it cleanly for the next cycle. Our grinding process ensures the bore corners are sharp and the slot opens evenly, so the part does not wobble or slip.
Looking for a different part? We also machine Custom CNC Auto Lathe Collet Set 25-32 Mid Series | BQUQ Precision Manufacturing in the same Dongguan factory.
What is your MOQ? No MOQ. We make one piece for testing or 10,000 for production. The unit price drops with quantity, but we do not force you to buy more than you need.
How do you guarantee tolerance and quality? We hold ±0.005 mm on the square bore and ±0.01 mm on slot width. Every piece is measured with a bore gauge and a profile projector. We send the inspection report with the shipment. If a piece is out of spec, we replace it at no cost.
What is the lead time for a custom collet? Prototypes take 7 working days from drawing approval. Production runs of up to 1,000 pieces take 10–12 working days. Larger orders are quoted individually. We ship via DHL or FedEx, door to door.
Can you provide material certificates? Yes. We supply mill certificates for the raw material and our own heat treatment report. If you need third-party testing, we can arrange it at cost.
Send us your drawing in PDF, STEP, or IGES format. We will review the material, hardness, and tolerance requirements, and give you a firm quote within 12 hours. No MOQ, no hidden tooling charges.
Email: sc@bquq.com WhatsApp: +86 13713157787
We are a precision manufacturing factory in Dongguan, China, with 20 years of experience in CNC machining, stamping, springs, and heat sinks. Your custom CNC collet chuck is made to your drawing, verified before shipment, and backed by a real inspection report.
| 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 |
