PEEK CNC Machining Services

From multi-stage annealing to stress relief to complex 5-axis geometries, our CNC-machined PEEK parts maintain dimensional stability even in the harshest environments.

One-Stop PEEK Machining Solution

Precision PEEK machining demands more than just standard CNC equipment; it requires a deep integration of material science and thermal engineering. At XTPROTO, we provide a one-stop solution that takes your project from raw high-performance polymer to mission-critical finished part. We manage the entire process under one roof: from initial DFM optimization to reduce material waste, to proprietary multi-stage annealing cycles that guarantee long-term dimensional stability. By combining elite 5-axis precision with industry-specific compliance and specialized contamination control, we eliminate the risks of warping and failure that define this “king of plastics.” We don’t just deliver parts; we deliver fully stress-relieved, high-tolerance PEEK solutions engineered to perform in the world’s most unforgiving environments.

Our Facility

XTPROTO operates a 160,000 sq. ft. state-of-the-art manufacturing facility staffed with over 500 professionals, including 120+ engineers dedicated to precision CNC machining and advanced component production. Fully AS9100:2016 Rev. D certified and ISO-compliant, our facility combines milling, turning, 5-axis machining, and precision PEEK and plastic processing under one roof. By integrating engineering expertise, process control, and end-to-end project management, we deliver high-precision, reliable, and durable components for aerospace, medical, and industrial applications, ensuring every part meets rigorous quality standards while optimizing cost and efficiency.

Our PEEK Machining Material

Selecting the correct PEEK grade is critical to component performance. We provide a full spectrum of high-performance PEEK variants, each backed by comprehensive material certification and optimized through our proprietary stress-relief processes.

Unfilled PEEK (Virgin)

Engineered for maximum chemical inertness and electrical insulation, Virgin PEEK provides a versatile solution for high-vacuum and FDA-regulated environments. It offers the highest elongation and impact resistance of all grades, maintaining its structural integrity and minimal outgassing properties at continuous operating temperatures up to 250°C (480°F).

Glass-Filled PEEK (GF30)

Reinforced with 30% glass fibers, GF30 is the definitive choice for structural applications requiring extreme dimensional stability. This grade drastically reduces the coefficient of linear thermal expansion (CLTE), ensuring precision tolerances and superior creep resistance under heavy static loads at temperatures reaching 315°C (600°F).

Carbon-Filled PEEK (CF30)

The pinnacle of mechanical strength, CF30 integrates carbon fiber to achieve the highest stiffness-to-weight ratio and enhanced thermal conductivity. It is specifically designed to dissipate heat and resist fatigue in high-vibration, dynamic-stress environments, providing unmatched performance for high-performance aerospace and automotive engine housings.

Medical-Grade PEEK (USP Class VI)

Optimized for life-critical healthcare applications, this biocompatible and radiolucent grade ensures clear diagnostic imaging while providing a high-strength alternative to metal implants. It is engineered to sustain repeated sterilization cycles, including autoclave, Gamma, and ETO, without compromising its mechanical properties or USP Class VI compliance.

Bearing-Grade PEEK (HPV)

Formulated with carbon fiber, PTFE, and graphite, Bearing-grade PEEK delivers exceptional tribological mastery in high-friction environments. Its self-lubricating properties achieve the lowest coefficient of friction and eliminate the risk of lubricant contamination, ensuring maintenance-free operation for high-speed bushings and dynamic seals in both dry and submerged conditions.

PEEK Material Performance Matrix

Property (Test Method)	PEEK Grade	Performance Values
Tensile Strength (ASTM D638)	Virgin / GF30 / CF30 / HPV	16k / 15k / 19k / 11k (psi)
Flexural Modulus (ASTM D790)	Virgin / GF30 / CF30 / HPV	0.6M / 1.0M / 1.25M / 1.1M (psi)
Heat Deflection (ASTM D648)	Virgin / GF30 / CF30 / HPV	320° / 600° / 550° / 383° (°F)
Expansion Coeff. (CLTE)	Virgin / GF30 / CF30 / HPV	2.6 / 1.2 / 1.1 / 1.7
Flammability (UL94)	All PEEK Grades	V-0 (Non-flammable)

XTPROTO PEEK Capability

High-performance PEEK components demand precision, repeatability, and full process control—challenges many shops cannot consistently meet. XTPROTO addresses this with a vertically integrated system that combines 5-axis CNC machining, multi-stage annealing, strict contamination control, and rigorous quality checks under one roof. By managing every critical step, we deliver stress-relieved, high-tolerance PEEK parts with consistent performance and complete traceability, making them ideal for medical, aerospace, and semiconductor applications.

Stress Management And Annealing

Internal stress control is a cornerstone of high-performance PEEK CNC machining. At XTPROTO, we employ a proprietary multi-stage annealing process integrated with precise thermal management to eliminate warping, residual stress, and micro-defects. This specialized focus on stress relief ensures that every PEEK CNC machined part maintains superior dimensional integrity and mechanical reliability. By neutralizing material tension at every stage of production, we deliver high-stability components capable of withstanding continuous thermal cycling, high-pressure sealing, and aggressive chemical exposure without failure.

Industry-specific Compliance

For medical and semiconductor applications, material purity is non-negotiable. We maintain a dedicated, metal-free contact production environment to prevent cross-contamination from metallic residues or aggressive industrial fluids. By utilizing specialized plastic-only filtration systems and medical-grade cleaning protocols, we ensure that every PEEK part retains its biocompatibility and high-purity characteristics, meeting the most rigorous USP Class VI and aerospace compliance standards.

Precision 5-axis Geometry

The high toughness of PEEK requires specialized high-frequency cutting techniques to prevent tool deflection and burring, especially in complex designs. Leveraging simultaneous 5-axis CNC technology and PCD diamond tooling, we successfully manufacture intricate geometries and thin-wall structures down to 0.5mm. Our process stability allows us to consistently achieve surface finishes of Ra 0.4 um, delivering mirror-like precision directly from the machine without the need for manual secondary finishing.

DFM And Cost Optimization

Given that PEEK material can cost up to 50 times more than aerospace aluminum, material yield is a critical factor in your project’s success. We act as your engineering consultants, providing deep Design for Manufacturing (DFM) analysis to optimize nesting strategies and tool paths. By refining geometries to suit PEEK’s specific machining behavior, we routinely reduce material waste by up to 20%, significantly lowering your procurement costs while maintaining absolute part performance.

Our CNC Machining Technology

CNC Machining

XTPROTO CNC machining delivers high-precision parts across metals and engineering plastics. From prototypes to production, we ensure tight tolerances and consistent quality for demanding applications.

CNC Turning

Our CNC turning services produce accurate cylindrical components with smooth finishes. Ideal for shafts, connectors, and precision prototypes with tight dimensional control.

CNC Milling

XTPROTO CNC milling handles complex geometries and multi-surface features. 3-, 4-, and 5-axis capabilities deliver precise pockets, slots, and contoured surfaces efficiently.

CNC Threading

CNC threading for internal and external threads, metric or imperial. We provide precise, repeatable threads for metal and plastic parts, suitable for medical, aerospace, and industrial applications.

CNC Tapping

High-accuracy CNC tapping supports blind and through holes. Fast turnaround and tight tolerances make it perfect for functional prototypes and high-volume production runs.

5-Axis Machining

Our 5-axis CNC machining enables complex multi-angle features in a single setup. Achieve high precision, eliminate multiple fixture errors, and produce intricate components with superior surface quality.

Quality Inspection

PEEK is a demanding material, highly sensitive to thermal stress, warping, and contamination. At XTPROTO, quality inspection is fully integrated into every stage of PEEK CNC machining to ensure that every part meets stringent dimensional, structural, and surface requirements. Our multi-layered approach combines in-process monitoring, first-article inspection, and final verification using advanced metrology tools, including coordinate measuring machines (CMMs), optical comparators, surface profilometers, and high-precision gauges. Each component is checked for dimensional accuracy, geometric tolerances, surface finish, and material integrity, with specialized protocols for stress-relieved and contamination-free PEEK parts. Statistical process control (SPC) and real-time data analysis detect deviations early, preventing defects from reaching downstream operations. All results are fully documented, traceable, and integrated into our ISO-compliant quality management system, ensuring PEEK components are delivered stable, reliable, and ready for critical applications in medical, aerospace, and semiconductor industries.

Workshop Equipment

XTPROTO’s workshop is equipped with advanced CNC machining centers designed for precision work with PEEK, plastics, and engineering metals. Our facility features a mix of 3-, 4-, and 5-axis CNC mills and turning centers, high-frequency cutting tools, and specialized PCD tooling, enabling the accurate production of complex geometries, thin-wall structures, and multi-surface components. Temperature-controlled workstations, dedicated plastic-only machining areas, and integrated in-process monitoring ensure that sensitive materials like PEEK maintain dimensional stability and surface integrity throughout production. Combined with automated material handling, precision measuring instruments, and real-time process feedback, our workshop setup allows high-volume and prototype production to meet tight tolerances, consistent quality, and repeatable results for critical aerospace, medical, and semiconductor applications.

Team & Engineering Capabilities

XTPROTO’s engineering team comprises over 120 experienced engineers within a 500+ strong workforce, dedicated to delivering precision PEEK and advanced plastic components. Our engineers work closely with project managers and manufacturing specialists to optimize part designs for manufacturability, reduce material waste, and ensure tight tolerances from prototype to full-scale production. Leveraging deep expertise in CNC milling, turning, 5-axis machining, and high-performance polymers, the team provides end-to-end support, including DFM analysis, process planning, and quality assurance integration. This collaborative approach ensures every component is designed, manufactured, and inspected to meet demanding aerospace, medical, and industrial standards, giving clients confidence in both performance and reliability.

PEEK Machining Tolerances

Feature	Specification	Notes
Standard Tolerance	±0.01 mm (±0.0005″)	Applies to most critical CNC features
Tight Tolerance	±0.005 mm (±0.0002″)	Achievable under controlled 3-/5-axis machining
Wall Thickness	0.75–0.80 mm	Depends on geometry and aspect ratio
Maximum Part Size	500 × 450 × 55 mm	Supports small and medium-large components
ISO Compliance	ISO 2768-f / ISO 2768-m	Applied when no drawing is provided
Inspection	CMM, calipers, 3D scanning	Ensures all features meet specified tolerances

Finishing Options

Polishing

Smooths surfaces and removes micro-pores, improving clarity, cleanliness, and aesthetic appeal.

Annealing

Reduces internal stress, enhances dimensional stability, and strengthens mechanical properties of PEEK parts.

Bead Blasting

Eliminates tool marks and creates a consistent matte finish for uniform texture.

Laser Engraving

Adds custom markings for traceability, branding, or regulatory compliance.

Deburring & Edge Smoothing

Ensures clean edges and precise geometry for high-precision assemblies.

Industries Using Machined PEEK Parts

XTPROTO’s CNC-machined PEEK components are engineered for industries that demand extreme performance, precision, and reliability. Thanks to PEEK’s exceptional strength, thermal stability, chemical resistance, and biocompatibility, our machined parts perform in the most challenging environments. Key industries and applications include:

Medical Devices

Surgical instrument housings, implants, diagnostic enclosures; biocompatible, sterilizable, and compliant with stringent regulatory standards.

Aerospace

Lightweight brackets, thermal insulation components, structural assemblies; high strength, heat resistance, dimensional stability.

Defense

High-performance fittings, protective housings, structural parts; durable, thermally stable, precise under extreme conditions.

Automotive & Transportation

Metal-alternative components; high tensile strength, heat resistance, reduced weight.

Oil, Gas & Energy

Seals, valve seats, wear rings; engineered for high-pressure, high-temperature, chemically aggressive environments.

Marine & Specialized Applications

Components that withstand harsh chemical, thermal, and mechanical conditions; engineered for extreme durability.

What is PEEK CNC Machining？

PEEK CNC machining refers to the precision manufacturing of parts from high‑performance polyether ether ketone (PEEK) material using computer‑controlled milling and turning machines. Because PEEK combines excellent strength, heat resistance, and chemical stability, CNC machining is the preferred way to produce complex geometries, tight tolerances, and reliable mechanical performance for demanding applications.At XTPROTO, PEEK CNC machining combines the material’s exceptional properties with our precision manufacturing expertise, ensuring parts are ready for demanding applications across medical, aerospace, automotive, and industrial projects.

Benefits of PEEK Machined Parts

Flame Retardancy & Safety– Retains UL94 V0 rating after machining, making parts safe for fire-sensitive applications.
Biocompatibility & Food-Safe Options– Suitable for medical implants, surgical devices, and food-contact applications, fully retaining regulatory compliance after machining.
Surface Finish Versatility– Supports polishing, matte or textured finishes, and custom laser marking for both functional and aesthetic requirements.
Wear & Abrasion Resistance– Ideal for high-wear applications such as bearings, bushings, and gears, extending service life under extreme conditions.

High Strength & Mechanical Reliability – CNC machining preserves and enhances PEEK’s tensile and flexural strength, producing durable parts capable of withstanding high stress and complex loads.
Thermal Stability– Maintains structural integrity at continuous temperatures up to 250°C (482°F), making it ideal for aerospace, automotive, and industrial environments.
Chemical Resistance– Resistant to acids, bases, hydrocarbons, and steam, ensuring long-term performance in aggressive chemical conditions.
Dimensional Accuracy– Tight CNC tolerances (as low as ±0.005 in / ±0.13 mm) combined with low moisture absorption guarantee stable, precise parts even after thermal cycling.

Why Choose XTPROTO for PEEK CNC Machining？

Full-Service Convenience

Material sourcing, CNC machining, annealing, finishing, and inspection all under one roof.

Fast, Reliable Delivery

From prototype to production, we keep your project on schedule.

Consistent High Quality

ISO-certified processes and comprehensive inspections guarantee dimensional stability and performance.

Expert Engineering Support

DFM guidance and optimized machining strategies reduce material waste and ensure manufacturability.

PEEK CNC Machining FAQs

What is PEEK in CNC machining?

PEEK (polyether ether ketone) is a high-performance thermoplastic used in precision CNC machining for parts that require exceptional strength, chemical resistance, and thermal stability. CNC machining allows PEEK to be shaped into complex geometries with tight tolerances for critical applications.

Why is PEEK preferred for CNC machining?

PEEK combines lightweight durability with outstanding mechanical and thermal properties. CNC machining ensures precise, repeatable components that maintain dimensional stability, making it ideal for medical, aerospace, automotive, and industrial applications.

What are the challenges of machining PEEK?

PEEK’s high toughness, thermal sensitivity, and low thermal conductivity require careful tool selection, optimized cutting parameters, and stress-relief procedures. Without proper handling, parts can warp, deform, or suffer surface imperfections.

Can PEEK be used in medical applications?

Yes. CNC-machined PEEK parts are biocompatible, sterilizable, and suitable for medical implants, surgical instruments, and diagnostic devices. Our processes preserve these properties while meeting stringent regulatory standards.

How does the cost of machining PEEK compare to metals?

PEEK is more expensive than standard metals, but its high strength-to-weight ratio, chemical resistance, and precision machinability often make it more cost-effective in high-performance applications where reliability and longevity are critical.

What surface treatments can be applied to PEEK parts?

PEEK can undergo finishing processes such as polishing, bead blasting, laser marking, or annealing to improve surface quality, dimensional stability, and appearance. These finishes enhance both functional and aesthetic performance.

Do you support rapid prototyping and small-batch production?

Yes. We offer fast prototyping and flexible low-volume production to accelerate product development while maintaining consistent quality.

Where do you ship PEEK parts?

We provide worldwide shipping and handle logistics to ensure your parts arrive safely and on schedule, from prototype to full production runs.

Contact XTPROTO for PEEK CNC Machining

XTPROTO is your trusted partner for precision PEEK CNC machining. As an ISO- and AS9100:2016-certified manufacturer, we deliver high-quality, reliable parts with tight tolerances and full traceability. From CNC milling and turning to advanced 5-axis machining, our team handles every project with expertise and care.