POM Machining Service for CNC Parts

Get POM machining parts with tight tolerances and smooth finishes. Suitable for both functional prototypes or production.

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 (CNC Delrin)

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 POM Machining

POM Machining Material Properties

Here are some key properties of Delrin machining material. 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.

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.
Can shrink slightly after machining, which may affect high-precision fits.