PEEK Machined Parts

PEEK (polyether ether ketone) is one of the highest-performing thermoplastics available for precision machined parts — rated for continuous service to 480°F (250°C), resistant to nearly all industrial chemicals, and dimensionally stable under sustained mechanical load. When you need a plastic machined part that can substitute for metal in demanding thermal, chemical, or structural environments, PEEK is the first material to evaluate.

Federal Materials machines PEEK to customer prints in prototype and production quantities. Our CNC turning and milling cells hold ±0.0005" on critical features, and we stock multiple PEEK grades — including unfilled, glass-filled, and carbon-filled — to match your application requirements.

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What We Machine in PEEK

Bearing rings and bushings — unfilled or carbon-filled; dry-run and lubricated applications
Valve seats and plug bodies — chemical-process and semiconductor industry
Seals and backup rings — high-pressure, high-temperature service
Wear pads and wear strips — glass-filled and carbon-filled grades for sliding contact
Structural brackets and housings — metal replacement in aerospace and medical device
Insulators and stand-off fasteners — PEEK's inherent dielectric properties
Semiconductor tooling components — ultra-clean, outgassing-controlled
Pump components — impellers, diffusers, retaining rings
Custom prototypes — from rod, plate, or tube stock with short lead times

Typical Tolerances

Dimension type	Production tolerance
Critical turned dims (OD/ID)	±0.0005"
General machined dims	±0.003"
Hole location (CNC milled)	±0.002"
Flatness (plates ≤ 12")	±0.002"
Surface finish	63 µin Ra standard; finer on request

PEEK is one of the most dimensionally stable engineering plastics under thermal and mechanical load. Parts should be allowed to equilibrate to ambient temperature after machining before final inspection — especially for close-tolerance bore work.

Finish Options

Finish	Description
As-machined	Smooth PEEK surface, deburred, edges broken — no treatment required
Polished bores	Lapped or honed to 32 µin Ra or better for seal and bearing applications
Anodizing / coating	Not applicable — PEEK does not require surface treatment
Passivation	Not required; PEEK is chemically inert

PEEK parts require no post-machining treatment for most applications. Specify bore finish requirements (Ra target) on your drawing.

Standard Turnaround

Stage	Lead time
Quote response	Same business day
Prototype / first article (1–5 pcs)	3–5 business days
Short run (6–50 pcs)	5–10 business days
Production run (50+ pcs)	10–15 business days

PEEK stock is maintained on-site. Lead times assume standard grades; specialty grades (carbon-filled, bearing grade) confirmed at quoting.

Materials We Stock (PEEK Stock Shapes)

Form	Grade	Sizes
Rod	Unfilled (natural/black)	¼" – 6" diameter
Rod	30% Glass-filled	¼" – 4" diameter
Rod	Carbon-filled (bearing grade)	¼" – 4" diameter
Plate	Unfilled, glass-filled	0.250" – 4.000" thick; up to 24" × 48"
Tube	Unfilled	Selected OD/wall; call for availability

All PEEK stock is extruded or compression-molded per ASTM D6262. Material certifications and RoHS documentation available on request.

Quality & Inspection

Dimensional inspection — in-process and final to print; CMM first-article available
Material certification — grade and lot traceability per ASTM D6262
Thermal annealing verification — stress-relieved stock used for close-tolerance work
Visual inspection — voids, surface defects, surface finish verification
Clean-room packaging — available for semiconductor and medical applications on request