Family-owned precision machine shop · Aurora, Illinois · Since 1986

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Materials · Mechanical plastics

Acetal machining

Custom acetal (Delrin®) parts CNC machined to your drawing or sample: bushings, gears, rollers, pistons and more. Machined in our Aurora, Illinois shop.

Quote an acetal part (630) 904-2525

Acetal at a glance

Full name
Polyoxymethylene (POM)
Also called
Delrin®, POM-C, POM-H
Known for
Stiffness, low friction and holding size
In water
Absorbs little water, so sizes stay stable
Grades
Copolymer, homopolymer, filled, food-contact and more

Parts in acetal

Acetal parts we machine

The parts we see most often in acetal, and why it suits each job. We machine any acetal part to your drawing or sample, listed here or not.

Need a different acetal part? Send the drawing, or the old part, and we’ll quote it. Request a quote

Is acetal right for the part?

Where acetal works, and where another plastic may suit

General guidance on how acetal behaves. If your drawing names acetal or Delrin®, we machine to it. Compare UHMW and acetal Compare acetal and nylon

Where it works

Stiffness
One of the stiffest and strongest unfilled plastics.
Holds size
Low moisture uptake and stable when machined, so parts stay to size.
Low friction
Slides smoothly and resists wear in moving parts.
Fatigue
Takes repeated loading well, as in gear teeth that mesh all day.
Fine detail
Machines cleanly into threads, small bores and gear teeth.
Food lines
Available in food-contact and metal-detectable grades.

Where another plastic may suit

If the part needs Often used instead
Heavy abrasion or impact Under abrasive sliding and hard knocks, UHMW usually outlasts it.
Strong acids or chlorine Strong acids and oxidizers, including chlorine, attack acetal.
Higher temperatures Its heat limit is moderate.
The lowest friction Acetal is slick, but PTFE is slicker and non-stick.

Precision in acetal

How we machine acetal

±0.002"–±0.005" On critical dimensions, depending on the plastic

Acetal is one of the most stable plastics to machine, so it usually sits toward the tighter end of our range. We confirm the critical dimensions with your quote.

  1. Fine features

    Acetal cuts cleanly, so it holds fine detail.

    We machine threads, small bores and gear teeth directly in acetal, to your drawing.

  2. Thin walls

    Heat from cutting can distort thin sections and long bores.

    We keep thin walls and bores cool as we cut, so they hold shape and size.

  3. Edges

    Even clean-cutting acetal leaves small burrs at edges and bores.

    We deburr edges and bores so parts fit and run the way they should.

Grades

Acetal grades

Acetal comes as copolymer, homopolymer and filled grades. Name the grade on your drawing, or tell us how the part runs and we’ll suggest one.

Grade Typically used for
Copolymer (POM-C) General machined parts. The most common choice, and consistent through thick rod and plate.
Homopolymer (Delrin®, POM-H) Parts that need slightly more stiffness and strength.
PTFE-filled Lower friction and wear in bushings and sliding parts.
Glass-filled Extra stiffness, and less growth with heat.
Food-contact grades Parts that touch food. Compliance comes with the grade’s supplier documentation.
Metal-detectable Food and pharmaceutical lines where stray fragments must be found. Detectable plastics
UV-stabilized Black grades for parts used in sunlight.

Buyer questions

Acetal FAQs

Something else? Call (630) 904-2525.

All plastics we machine

Delrin® is a well-known brand of acetal homopolymer, and many buyers use the name for any acetal. If your drawing specifies Delrin, we machine the part in Delrin. If it says acetal, copolymer is the usual choice. Delrin® is a registered trademark; CDS is not affiliated with its owner.

Homopolymer is slightly stiffer and stronger. Copolymer is more stable in hot water and many chemicals, and is consistent through thick stock. Both machine well. We machine whichever your drawing names, or suggest one with your quote.

Food-contact grades of acetal are widely used in food processing equipment. Compliance comes with the specific grade and its supplier documentation, so tell us the requirement and we’ll suggest suitable grades.

Yes. We supply acetal sheet and rod, cut to size when you need it, through our material supply service.

Getting a quote

Start with what you have

A drawing, a sketch or the worn acetal part itself. Our experienced team takes it from there.

Request a quote (630) 904-2525
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