POM Machining Service for CNC Parts
Get POM machining parts with tight tolerances and smooth finishes. Suitable for both functional prototypes or production.
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We Provide POM Machining Service to Match Your Needs!
We machine a lot of parts from POM, also known as Acetal or Delrin®. It’s one of the easier plastics to work with on a CNC because it cuts clean, holds its shape well, and doesn’t absorb much moisture. We’ve built up a good bit of experience running it for functional parts that need good wear resistance, tight tolerances, or low friction.
- Tight tolerances, typically ±0.05 mm or better
- Smooth surface finish, suitable for moving parts
- Reliable performance from prototype to small production runs
- Machining process adjusted to minimize stress and deformation
- Good at integrating POM parts with metal assemblies
- Support from our engineering team for design and material selection
What is Machined POM
POM CNC machining refers to using CNC milling or turning to cut POM (also called Acetal or Delrin®) into precise shapes. POM is a tough, low-friction plastic with good dimensional stability, which makes it ideal for tight-tolerance parts. It machines cleanly without melting or chipping, and it doesn’t absorb much moisture, so the final parts stay stable over time.
Types of Machining
POM Machining Material Properties
Here are some key properties of machined POM parts. These values are typical and may vary depending on the grade and additives
| Item | Value |
|---|---|
| Density | ~1.41 g/cm³ |
| Tensile Strength | ~60–70 MPa |
| Elongation at Break | ~20–40% |
| Flexural Modulus | ~2,500 MPa |
| Impact Strength (Notched) | ~3–6 kJ/m² |
| Max Operating Temperature | ~100–110°C |
| Water Absorption (24h) | <0.2% |
Benefits of POM CNC Machining
- POM machines cleanly and holds tight tolerances, even on complex parts.
- The material has low friction and good wear resistance, making it great for moving parts.
- It absorbs very little moisture, so dimensional stability stays consistent.
- Strong and rigid, it can take mechanical stress without warping or cracking.
- Surface finish after machining is smooth without much post-processing.
- Good chemical resistance to fuels, oils, and many solvents.
Shortcomings of POM CNC Machining
- It can be tricky to bond or glue—parts usually need to be mechanically fastened.
- Not ideal for high-heat applications, as it softens around 100°C.
- Chips can be stringy and hard to evacuate during machining if not managed well.
- Doesn’t hold paint or coatings easily due to its low surface energy.
- It can shrink slightly after machining, which may affect high-precision fits.
Popular POM Machined Part
Here are some popular POM machined parts we have made:
- Gears
- Bushings
- Rollers
- Spacers
- Pulleys
- Mounting brackets
- Structural support parts
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