Plastic CNC Machining: PEEK vs POM vs PTFE for Precision Parts

What buyers are trying to solve

Searches for plastic CNC machining PEEK POM PTFE usually come from engineering or procurement teams that already have a CAD model and need a manufacturable route, not a generic machining definition. The decision is normally about material risk, tolerance risk, surface finish, inspection paperwork and whether a supplier can move from prototype to repeat production without changing the process.

Best-fit applications

• Bushings, gears, insulators, fixtures, valve parts and lightweight mechanical components.
• Parts where metal is too heavy, conductive, corrosive or expensive.
• Prototypes and low-volume plastic components before molding.

Manufacturing route

• Use conservative clamping and sharp tools to avoid stress and burrs.
• Machine critical features after roughing if the polymer tends to move.
• Specify environment because moisture, heat and chemicals change material choice.

Material and finish choices

• PEEK for high temperature, chemical resistance and premium performance.
• POM/Delrin for stiffness, machinability, low friction and cost control.
• PTFE for extreme low friction and chemical resistance, with creep risk considered.

Risk controls before quoting

• Plastic parts should not copy metal tolerances blindly.
• Thin walls, press fits and threaded plastic features need design review.
• Humidity and temperature can affect final dimensions.

RFQ inputs that improve quote accuracy

• Operating temperature, chemical exposure and mechanical load.
• Material grade, color and certificate requirement.
• Critical dimensions and whether the part sees sliding, sealing or insulation use.

Related FabVector resources

• PEEK
• POM / Delrin
• PTFE

When the part includes thin walls, sealing faces, tight datums, threaded features or inspection requirements, upload the CAD model through the structured RFQ flow so material, finish, tolerance, inspection and delivery expectations stay attached to the same request.