OpeningYour 25 Type square bore spring collet is machined to your exact drawing. We verify every critical dimension before shipment. No guesswork, no mismatched tapers.This is a pr
Custom CNC Machined Auto Lathe 25 Type Square Bore Spring Collet
OpeningYour 25 Type square bore spring collet is machined to your exact drawing. We verify every critical dimension before shipment. No guesswork, no mismatched tapers.This is a precision part. It hol
Get a Fast Quote for This Part
Send us your drawing / quantity / material — reply within 24h.
Your 25 Type square bore spring collet is machined to your exact drawing. We verify every critical dimension before shipment. No guesswork, no mismatched tapers.
This is a precision part. It holds your workpiece concentric to the spindle. If the bore is off by a few microns, your parts drift. We do not let that happen.
At a glance: Tolerance ±0.005 mm on bore and taper, surface finish Ra 0.4, lead time 7–10 working days, no MOQ.
Specifications
We run these collets on our own CNC Swiss-type lathes and CNC milling machines. The process is stable, repeatable, and documented.
Parameter
Value
Material options
65Mn spring steel, 60Si2MnA, 9Cr18 stainless, 40CrMo
Hardness
HRC 42–48 (spring steel), HRC 50–55 (stainless)
Bore tolerance
±0.005 mm
Taper angle tolerance
±0.005 mm over gauge line
Surface finish
Ra 0.4 on bore, Ra 0.8 on OD
Slit width
0.3–1.0 mm, per drawing
Square bore size range
2.0–25.0 mm
Concentricity
≤0.008 mm TIR
Batch size
1 piece to 10,000 pieces
Lead time
7–10 working days for standard sizes
Inspection
100% dimensional check, report per batch
We use wire-cut EDM for the slits. This gives a clean, burr-free cut with consistent slot width. No hand filing, no variation between slots.
Heat treatment is done in-house with vacuum furnaces. We control the quench and temper cycle to hit your specified hardness exactly. Then we grind the bore and taper on a CNC internal grinder.
Three reasons buyers send us their drawings
1. Batch-traceable quality. Every collet gets a unique batch number. We record material heat number, heat treatment parameters, and final inspection data. If you have a problem in production, we trace it back to the exact process step. You get full traceability, not a vague "we checked it."
2. Inspection report per batch. You receive a dimensional inspection report with every order. We measure bore size, taper angle, concentricity, and hardness. The report shows actual values, not just "pass/fail." Your QC team can verify our numbers against their own.
3. One factory for CNC + stamping + springs + heat sinks. You are not dealing with a trading company. We own the machines. If your collet needs a spring-loaded ejector pin, we make the spring in-house. If your assembly needs a stamped retainer plate, we stamp it. If your spindle needs a heat sink, we machine it. One purchase order, one responsible party, no coordination headaches.
Where these parts are used
The 25 Type square bore spring collet is standard on many automatic lathes, including Citizen, Star, and Tsugami machines. The square bore is designed for holding square or hex bar stock without marking the surface.
Typical applications:
Watch and instrument manufacturing. Small square brass or steel bars for pinions, gears, and shafts.
Medical device components. Stainless square wire for surgical instruments and implants.
Fastener production. Square stock for bolts, screws, and custom fasteners.
Electronic connector pins. Precision square pins for high-density connectors.
Automotive fuel injector parts. Small square blanks that need tight concentricity.
The collet closes around the square bar, gripping on the flats. This prevents rotation and keeps the part centered. Our bore tolerance ensures the bar is held firmly without deformation.
Q: What is your MOQ?
A: No MOQ. We make one piece for prototype validation or 10,000 pieces 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 the tolerance and quality?
A: We use CNC grinding and wire-cut EDM, not manual processes. Every collet is measured on a coordinate measuring machine (CMM) and a hardness tester. The inspection report is included with the shipment. If a dimension is out of spec, we rework or replace it at no cost.
Q: What is your lead time?
A: Standard sizes ship in 7–10 working days. Custom bore shapes or special materials may take 12–15 working days. We confirm the exact lead time when you send your drawing.
Q: Can you provide material certificates?
A: Yes. We provide mill certificates for the raw material, heat treatment reports, and hardness test certificates. All documents are in English and can be notarized if your customer requires it.
Send your drawing
Send us your drawing or a sample part. We will review the material, tolerance, and quantity, and give you a firm quote within 12 hours.
We are a precision manufacturing factory in Dongguan, China, with 20 years of experience. Your custom CNC collet chuck is made in China, but with the quality and traceability you expect from a tier-one supplier.
Email your drawing to sc@bquq.com or message us on WhatsApp at +86 13713157787.
No MOQ. No pressure. Just a clear quote and a part that fits.
