We machine PEEK parts for engineers who cannot tolerate swelling, outgassing or a failed seal. Tight tolerances, clean handling and documented inspection from our Dongguan and Singapore plants.
Most failures start before the first cut. These are the four we see most often.
PEEK absorbs moisture slowly. A part cut with heavy coolant and no stress relief can move after it leaves the machine. The seal then leaks at pressure, and nobody finds out until the assembly is tested. Drying and stress relief before the finish pass fix most of this.
PEEK stock runs well above aluminum or acetal. One wrong toolpath, one tool that rubs instead of cuts, and you lose a blank worth more than the labor. We program conservative feeds for the first article and confirm dimensions before running the rest.
Medical and semiconductor customers ask for low extractables and no embedded chips. Cutting with the wrong coolant or blending the surface traps contamination in the pores. We keep PEEK on separate tooling and clean the parts before packing.
Filled grades and unfilled grades behave differently. A shop that treats every polymer the same will burn the edges on 30% glass-filled PEEK and cut the unfilled grade too slowly. We ask which grade you specified before quoting.
Two things decide whether a PEEK part works: how the material is held and how the cutter engages it.
Unfilled PEEK expands roughly three times as fast as aluminum with temperature. A groove measured at 20 °C will read differently at 60 °C in service. Before we quote a tolerance, we ask the operating temperature and whether the drawing was dimensioned at room temperature.
For most parts we hold ±0.005 mm on critical features and note which dimensions are functional, so inspection focuses where it matters.
PEEK is soft enough to compress under a clamp and stiff enough to spring back when you release it. We use soft jaws or vacuum fixturing on thin walls, and take light finish passes so the part does not relax after the last cut.
Where a spec calls for low particle shedding, we finish with sharp carbide and avoid aggressive tumbling that would embed media in the surface.
This is a starting point, not a substitute for your material spec.
| Grade | Best for | Watch out for |
|---|---|---|
| Unfilled PEEK | Seals, bushings, insulators | Highest thermal expansion |
| 30% glass-filled | Structural brackets, wear parts | Abrasive to tooling, burrs |
| 30% carbon-filled | Stiff, low-creep parts | Conductive, not for insulation |
| Medical grade | Implant and instrument parts | Requires documented handling |
| Semiconductor grade | Wafer handling, fluid parts | Low extractables needed |
| Food grade | Pump and valve components | Cleaning validation applies |
One shop for the operations your part needs, from first article to production.
Complex PEEK geometry in one setup. 16 simultaneous 5-axis centers handle contoured seals and angled ports without re-fixturing.
Bushings, sleeves and seal rings turned to diameter and face runout. Mill-turn centers cut cross holes without a second operation.
Plates, manifolds and housings. 27 three-axis and 12 four-axis machines cover simple profiles at volume.
One-off PEEK prototypes to test fit and chemical compatibility before you commit to a production run.
Bead blasting, brushing and polishing where the spec allows. We avoid processes that embed media in PEEK.
100% inspection before shipment. Raw material check, in-process monitoring and final reports on request.
Numbers from our current equipment list.
| Item | Range |
|---|---|
| Achievable tolerance | ±0.005 mm (±0.0002 in) |
| Fine finish | Ra 0.2–0.8 μm |
| Standard finish | Ra 0.8–1.6 μm |
| Maximum part size | 4,000 mm |
| Rotary table | Ø400 mm |
| Order quantity | One prototype to 10,000+ parts |
The equipment matters less than how it is used on PEEK.
Fifteen years of cutting engineering plastics and metals in Dongguan, with a second plant in Singapore.
Sixteen simultaneous 5-axis centers, twelve four-axis mills, twenty-seven three-axis machines and sixteen mill-turn centers.
Held on critical features after we agree which dimensions are functional and which are reference.
Quotation and a free DFM analysis within 12 hours of receiving a usable drawing.
Parts that pass inspection on the first submission, backed by 100% inspection before shipment.
We run a single prototype or a 10,000-part batch on the same process and inspection plan.
Instrument housings and implant-grade components. The spec asks for documented material traceability and clean handling.
Wafer-contact and fluid-path parts. The spec asks for low extractables and no embedded media.
Bushings and insulators where weight and chemical resistance both matter. The spec asks for repeatable dimensions across batches.
Seal rings and wear components in drivetrain assemblies. The spec asks for PPAP documentation and stable processes at volume.
PEEK is a semi-crystalline thermoplastic in the polyaryletherketone family. It holds strength at high temperature, resists acids, bases and most solvents, and burns with low smoke and low toxicity.
Molding makes sense at high volume with simple geometry. Machining makes sense for prototypes, low to mid volume, tight tolerances and features a mold cannot pull, such as undercuts and deep cross holes.
We hold ±0.005 mm on critical features when the part geometry and wall thickness allow it. Thin walls and large unsupported spans will move, so we agree on which dimensions are functional before cutting.
Because PEEK expands about three times as much as aluminum, we also need the temperature at which the part will be measured and used.
Yes. Unfilled PEEK takes on a small amount of moisture over time, and the part grows slightly. In a seal groove or a press fit, that movement can change the fit.
We dry blanks before machining and, where the application is sensitive, cut to a target that accounts for service conditions rather than room-temperature numbers alone.
Yes. Filled grades are more abrasive to tooling, so we adjust speeds, feeds and tool material. Glass-filled PEEK also burrs more, which changes how we plan the finish pass.
Tell us the exact grade and supplier if you have one. The difference between unfilled and 30% glass-filled is large enough to change the whole program.
We reach Ra 0.8–1.6 μm as a standard machined finish, and Ra 0.2–0.8 μm on fine-finish features. The practical limit depends on the geometry and the grade.
For medical and semiconductor parts, we avoid bead blasting and tumbling because the media can lodge in the surface. Sharp cutting tools and light finish passes leave a cleaner surface.
PEEK runs on tooling that is kept separate from metal work, and we clean parts before packing. Coolant choice is made with the cleanliness spec in mind, not just tool life.
We operate under ISO 13485:2016 and ISO 9001:2015 and can supply inspection reports on request. Uploads are kept confidential and an NDA is available if you need one.
Quotation and a free DFM analysis come back within 12 hours. Production can start within 24 hours of approval, and parts typically ship in 3–5 days.
There is no minimum order quantity. We run one prototype or a run of 10,000+ parts on the same process plan.
Send a 3D model or a dimensioned 2D drawing, the PEEK grade, the quantity and any cleanliness or documentation requirements. If you know the operating temperature and chemical exposure, include those too.
If a dimension is functional rather than reference, say so. That single note often decides whether the part passes inspection.
Upload a model or print and we will come back with a price, a DFM note and a lead time.
12-hour quote100% inspectionNo minimum order quantityNDA on request
Trusted by engineers and manufacturers worldwide
Upload your 3D model or 2D drawing and get a quotation with a free DFM analysis. Maximum processing size 4,000 mm.
CNC Metals 13 grades
CNC Plastics 10 grades
Machines & processes 12 options
Surface & post-processing 10 options
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