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Delrin (Acetal/POM) CNC Machining Guide Delrin — DuPont's trade name for homopolymer acetal (polyoxymethylene, POM-H) — is one of the most reliable engineering plastics on a CNC machine. It cuts cleanly, holds tolerance well, and produces a finish close to that of soft metals. Olympus Machining is a U.S.-based, ITAR-registered precision CNC machining shop in Hanover, Pennsylvania producing Delrin and Acetal components for OEMs nationwide. ## What Is Delrin? Delrin is a semi-crystalline thermoplastic produced by polymerizing formaldehyde. There are two common families: homopolymer (Delrin / POM-H) and copolymer (Acetal / POM-C). Homopolymer is stiffer and has higher tensile strength; copolymer is more dimensionally stable in long-term hot or wet service and machines with slightly less center-line porosity. Both are widely specified as a metal replacement where weight, corrosion resistance, and low-friction wear matter more than peak temperature performance. - **Tensile strength:** ~70 MPa (10 ksi) for Delrin 150; ~60 MPa for copolymer Acetal. - **Continuous service temperature:** ~180°F (82°C); short-term excursions to ~250°F. - **Density:** ~1.42 g/cm³ — roughly one-fifth the weight of steel. - **Coefficient of friction:** ~0.2 against steel, dry — excellent for bearings and gears. - **Water absorption:** ~0.2% over 24 hours — among the lowest of engineering plastics. ## Machining Approach Delrin machines a lot like brass: free-cutting, low cutting forces, long stringy chips. Olympus Machining runs Delrin with sharp, polished carbide tooling and positive rake geometries to keep chips evacuating and avoid heat build-up at the cutting edge. Coolant is optional for most milling operations — air blast is usually enough — but flood coolant helps on deep turning and long bar work to keep the part dimensionally stable. The biggest production risk is stress-induced distortion in thick stock. Rod and plate over ~2″ section can hold residual stress from extrusion or molding; we rough such parts oversize, allow them to stabilize, then take light finishing passes for final dimensions on tolerance-critical features. ## Typical Tolerances & Finish - ±0.002″ on milled features, ±0.001″ on precision turned features as standard. - Tighter tolerances are achievable on small, thin parts; thermal expansion (~10× that of steel) drives the limit on larger envelopes. - Ra 0.8 µm achievable as-machined; polished or burnished finishes available on request. - Certificates of Conformance and material traceability with every shipment. ## Typical Applications ### Industrial / Motion Bushings, sleeve bearings, cams, gears, wear strips, conveyor guides, sliding components. ### Fluid Handling Pump manifolds, valve bodies, fittings, and bodies for low-pressure liquid handling. ### Electrical / Fixturing Insulators, test fixtures, machine guards, and tooling components where metal would gall or arc. ## Delrin vs. Other Engineering Plastics - **Delrin vs. Nylon (PA6/PA66):** Delrin holds tighter tolerance because nylon absorbs water and grows by up to 2–3%. Choose Delrin where dimensional stability matters; choose nylon where impact toughness leads. - **Delrin vs. UHMW-PE:** UHMW has lower friction and better wear in abrasive sliding; Delrin is stiffer and machines to a finer tolerance. - **Delrin vs. PEEK:** PEEK serves continuously above 480°F and is chemically inert; Delrin is roughly an order of magnitude less expensive and far easier to machine. ## Need Delrin Parts Quoted? Send a drawing or STEP file with the grade specified (Delrin 150, Delrin 100, Acetal copolymer) and tolerance schedule. A CAM engineer reviews every quote. [Submit a Drawing](/#submission) ## Related - • [All Materials Machined](/materials-machined) - • [PEEK CNC Machining](/materials/peek-cnc-machining) - • [Titanium CNC Machining](/materials/titanium-cnc-machining) - • [6061 vs 7075 Aluminum](/materials/6061-vs-7075-aluminum) - • [CNC Milling Services](/cnc-milling) - • [CNC Turning Services](/cnc-turning) Last reviewed: May 12, 2026 [CNC Milling](/cnc-milling) [CNC Turning](/cnc-turning) [Quality Assurance](/quality-assurance) [Prototype to Production](/prototype-to-production) [Industries Served](/industries-served) [Materials Machined](/materials-machined) [Robotics & Automation Machining](/robotics-automation-machining) [Precision CNC Machining](/precision-cnc-machining) [Careers](/careers) [ITAR CNC Machining for Mid-Atlantic Aerospace OEMs](/itar-cnc-machining-mid-atlantic-aerospace) [CNC Tolerances & GD&T Guide](/resources/cnc-machining-tolerances-gdt-guide) [Reducing CNC Machining Costs](/resources/reducing-cnc-machining-costs) [6061 vs 7075 Aluminum](/materials/6061-vs-7075-aluminum) [Brass vs Bronze Machining](/materials/brass-vs-bronze-machining) [![Olympus Machining LLC logo — CNC machining shop Hanover, PA](/assets/olympus-logo-DbWcTX06.webp)](/) Olympus Machining LLC is a precision CNC machining shop in Hanover, Pennsylvania, providing CNC milling and turning services for OEMs and manufacturers nationwide. Olympus Machining LLC · 639 Frederick St, Suite 1 · Hanover, PA 17331 · [(717) 634-5094](tel:+17176345094) Explore all [areas served, industries, and capabilities →](/sitemap) © 2026 All rights reserved.[Admin](/auth) [Compliance & Cybersecurity](/compliance)[Privacy Policy](/privacy-policy)[Sitemap](/sitemap) ITAR-aligned internal controls. Cybersecurity practices aligned with CMMC Level 1 (FAR 52.204-21). [Call (717) 634-5094 ](tel:+17176345094)