Custom precision CNC POM parts in China
We manufacture custom CNC machining POM parts in China with tight tolerances, repeatable quality, and scalable production — from a single prototype to high-volume serial runs.
Specializing in acetal (polyoxymethylene) components for gears, bushings, housings, and precision mechanisms, our machining center combines multi-axis CNC capability with in-process quality control to deliver parts that match your drawing exactly.
Why POM is chosen for precision components
Polyoxymethylene (POM), also known as acetal or polyacetal, is an engineering thermoplastic valued where dimensional accuracy, low friction, and mechanical durability must coexist in one part.
Material behavior under machining
POM machines cleanly with sharp carbide tooling, producing smooth side walls and crisp edge definition without the melting or burring common to softer thermoplastics. Its low moisture absorption — below 0.3 % at equilibrium — means that custom CNC machining POM parts in China hold their printed dimensions after shipping and across seasonal humidity shifts.
Both homopolymer and copolymer grades are routinely machined in our workshop. Homopolymer POM offers higher tensile strength and stiffness, while copolymer POM provides improved chemical resistance and thermal stability for continuous-use environments. We select the grade based on your part's function and the resin specified on the drawing.
For buyers sourcing custom CNC machining POM parts in China, the critical advantage is consistent material behavior: predictable shrinkage, stable modulus, and repeatable surface finish batch after batch.
Core material advantages
- Low moisture absorption keeps dimensions stable in humid environments.
- Natural lubricity reduces wear in gear and sliding-contact applications.
- High fatigue resistance supports long-cycle moving components.
- Good solvent and hydrocarbon resistance for industrial exposure.
Engineering benefits of machined POM
Four properties that make POM the default choice for precision plastic components across demanding industries.
Dimensional stability
Minimal water uptake and a low coefficient of thermal expansion allow POM parts to maintain close tolerances across temperature and humidity cycles, critical for mating assemblies.
Mechanical strength
High stiffness, tensile strength, and creep resistance enable POM to carry continuous loads without permanent deformation, even in thin-wall structural sections.
Low friction & wear
Intrinsic self-lubricating behavior reduces friction in gear trains, bushings, and sliding contacts, extending service life without external grease or oil.
Chemical resistance
POM withstands neutral chemicals, solvents, fuels, and cleaning agents, making it suitable for automotive, industrial, and appliance fluid-contact parts.
POM commercial grades by regional standard
Drawings from different regions reference different material standards and commercial brands. Below is a practical cross- reference of the standards and representative resin grades we regularly machine for custom CNC machining POM parts in China.
ASTM standard
- Delrin® — DuPont (homopolymer)
- Celcon® — Celanese (copolymer)
ISO standard
- Hostaform® — Celanese
- Ultraform® — BASF
JIS industrial grades
- Duracon® — Polyplastics
- Iupital® — Mitsubishi Gas Chemical
- Tenac™ — Asahi Kasei
GB/T national standard
- Domestic copolymer POM resins
- Imported equivalent grades on request
Machining capabilities for POM components
Our production floor covers the full range of processes needed to turn POM stock into finished, ready-to-assemble components.
CNC milling
3-axis and 5-axis vertical machining centers produce complex pockets, contours, and 3D surfaces with repeatable positioning accuracy.
CNC turning
Lathes with live tooling combine turning, milling, and cross-drilling in a single setup, reducing stack-up error on rotational POM parts.
Drilling & tapping
Precision drilled holes and tapped threads from M1 upward, with controlled chip evacuation to protect thread form in acetal material.
Grinding & lapping
Surface and cylindrical grinding achieve sub-micron flatness and roundness for sealing surfaces and precision bearing journals.
Secondary assembly
Ultrasonic welding, press-fitting, and sub-assembly kitting allow us to deliver complete POM-containing assemblies rather than loose parts.
Finishing & deburring
Hand deburring, vapor polishing, and tumble finishing remove machining marks and produce the cosmetic or functional surface your drawing requires.
Representative POM parts we manufacture
A selection of custom CNC machining POM parts in China produced for customers across automotive, industrial, and consumer sectors. Each part is made to customer drawing.
Industries & applications
POM components appear wherever a precision plastic part must combine strength, smooth motion, and dimensional consistency.
Automotive
Fuel system components, door-lock gears, seat mechanism parts, and sensor housings.
Consumer electronics
Camera module gears, printer rollers, and small structural actuators.
Medical devices
Diagnostic instrument components, drug-delivery mechanism parts, and fluid-handling pieces.
Industrial automation
Conveyor components, linear guide sliders, bearing blocks, and machine wear pads.
Precision instruments
Optical positioning stages, metrology fixtures, and calibration reference parts.
Home appliances
Pump impellers, valve bodies, gearbox components, and timer mechanisms.
Aerospace interiors
Non-structural interior mechanisms, latch components, and light-duty actuators.
Semiconductor
Wafer handling fixtures, insulating spacers, and cleanroom-compatible tooling parts.
Tolerance & production specifications
Standard capability parameters for custom CNC machining POM parts in China. Tighter values are achievable on request and validated during first-article inspection.
Linear tolerance
Standard ISO 2768-fine; tighter tolerances quoted per feature on the drawing.
Surface finish
As-machined standard Ra 0.8; polished or vapor-finished surfaces available.
Thread range
Metric and unified threads, plus custom thread forms per drawing specification.
Stock forms
Extruded rod, cast sheet, and tubular stock; injection-molded blanks for high volume.
What to expect from our production
A transparent, engineering-led approach to manufacturing custom CNC machining POM parts in China.
Material traceability
Resin batch records and stock identification are retained for every production lot, so material origin can be traced back from a finished part.
In-process inspection
Coordinate measuring machines, calibrated micrometers, and optical comparators verify critical dimensions at defined checkpoints during each run.
Flexible batch sizing
From one-off prototypes through mid-volume bridge production to mass production, the same quality protocol applies to every order size.
Engineering feedback
We review every drawing for machinability and suggest design changes that reduce cost or improve tolerance hold — before metal (or plastic) is cut.
Precision POM parts, machined to your drawing
Whether you need a single prototype gear or a long-running production contract for custom CNC machining POM parts in China, our workshop is set up to deliver consistent acetal components with tight tolerances, clean surface finish, and full material traceability. Send your drawing and we will confirm the grade, process, and timeline that fit your project.