Collets & Collet Fixtures
Machined collets and collet holders for accurate, repeatable small-part workholding.
Collets that grip a diameter evenly rather than at three points, which is what you need on a finished or thin-walled part. Made to the part diameter, not to a nominal size.
How we make it: Custom CNC parts service →
2–4 weeks
1 piece
ISO 9001:2015
Technical Specifications
| Parameter | Value | Unit |
|---|---|---|
| Bore range | Ø1–Ø60 | mm |
| Concentricity | ≤0.01 | mm TIR |
| Hardness | 48–55 | HRC |
| Slots | 3 or 4 | - |
| Repeatability | 0.01 | mm |
| Bore finish | Ground / lapped | - |
Available Materials
- Spring steel C67S
- Stainless 1.4310
- Brass (non-marking)
- Aluminium (soft)
Typical Applications
- Small turned parts
- Second-operation work
- Thin-wall holding
- Tool holding
- Inspection holding
Surface Finishes
- Hardened + ground
- Polished bore
- Nylon-lined (non-marking)
- Laser marked size
Industries Served
- Medical
- Instrumentation
- Automotive & EV
- Aerospace
- Consumer Electronics
What drives the price of this part
Derived from the callouts on this page. Where a driver is not on the drawing, it is not on this list.
- Tolerance
- Concentricity at ≤0.01 mm TIR is the tightest callout this family carries. Tightening a callout is a process decision, not a machining decision: below the standard ±0.005 mm the work moves to grinding or jig boring, and the price moves with it.
- Part size
- Bore range at Ø1–Ø60 mm decides which machine the part lands on and how many setups it needs. Size is the driver buyers most often leave out of a first enquiry, and it is the one that changes the quote fastest.
- Order size
- Minimum order is 1 piece, so on a first order setup and programming are spread over very few parts and they are most of the price. Repeat orders at the same quantity are cheaper without anything on the drawing changing.
See how cycle time is calculated in the machining time calculator and what else moves a price in the cost driver reference.
How these parts are inspected
Matched to the callouts above and the instruments actually on the floor.
- Coordinate measuring machine (Zeiss CONTURA G2, two machines, GR&R 8.4% on the critical feature)
- Dimensional report against the drawing, with a 100% check on critical features rather than a sample
- Certificate of conformance and the mill certificate with every shipment
- Rockwell hardness tester on the part, not only against the mill certificate
- Bore gauges and an optical comparator for hole position and edge form
The full equipment list, with counts, is on the capability page; the inspection sequence is on quality and inspection.
Questions buyers ask
- Why make a collet to the part diameter instead of buying a standard one?
- Because standard collets have a small clamping range and grip unevenly outside it. On a thin wall you see that as an out-of-round part, which no amount of straightening fixes.
Related part families
Soft Jaws & Chuck Jaws
Soft jaws machined to your part profile, for holding finished or odd-shaped work without marking.
Workholding Fixtures
Machining fixtures that locate on the casting or forging datum, repeatable to 0.02 mm.
Inspection Fixtures & Gauges
CMM fixtures, check gauges and go/no-go tooling built from your CAD and certified dimensionally.