top of page
Est. 2009 - Phone: +1 514 524 9990
Acetal (Delrin) CNC Machine Parts, Instant Quote
ACETAL
Polyoxymethylene (POM)
Free Shipping Canada
orders over $250 excluding oversize parcels. please see details.
MANUFACTURING PROCESSES OFFERED
CNC Router
uMake.ca – Online Factory specializes in CNC-machined parts made from acetal (also known as POM or Delrin), delivering precision components across Canada with free shipping and instant online quoting. Acetal is a high-performance engineering plastic prized for its combination of strength, rigidity, low friction, and excellent wear resistance — all while being dimensionally stable and resistant to moisture, chemicals, and solvents.
Whether you need gears, bearings, bushings, or sliding mechanical parts, acetal’s ease of machining and ability to hold tight tolerances make it an ideal choice for industrial, automotive, or custom applications.
With uMake.ca’s streamlined CNC workflow, no minimum quantities, and fast Canada-wide delivery, you get reliable, high-quality custom plastic parts — delivered on your schedule.
Acetal Properties & Engineering Performance
What is acetal plastic and why do engineers specify it for precision mechanical components?
Acetal — also known as POM (polyoxymethylene) or polyacetal — is a high-performance engineering thermoplastic prized for its exceptional dimensional stability, low friction, and resistance to fatigue and wear. It machines to extremely tight tolerances with a surface finish approaching ground metal, making it the go-to material for gears, bushings, cams, precision slides, and wear plates where nylon, ABS, or acrylic would creep, absorb moisture, or wear prematurely. uMake machines acetal to ±0.1 mm tolerances via CNC routing. Quote your acetal precision components at app.umake.ca.
How does acetal compare to nylon and UHMW for mechanical applications?
Nylon absorbs moisture, which causes dimensional changes and reduces mechanical properties in humid environments — a serious limitation for precision components. UHMW offers superior abrasion resistance but is difficult to machine to tight tolerances due to its tendency to deflect under cutting forces. Acetal occupies the precision sweet spot: it has negligible moisture absorption (0.2% vs. 1.5% for nylon), machines to metal-like tolerances, and provides excellent wear resistance. For gears, bearing surfaces, and sliding components where dimensional consistency is critical across humidity cycles, acetal wins over both alternatives.
What acetal grades does uMake stock — natural, black, filled grades?
uMake stocks acetal in natural (white/off-white) and black sheet and rod. Natural acetal is homopolymer or copolymer grade suitable for the vast majority of mechanical component applications. Black acetal is UV-stabilized for applications with incidental light exposure. Glass-filled and PTFE-filled acetal grades — which provide enhanced stiffness or lower friction respectively — can be sourced on request for specialized applications. All stock is sourced from documented suppliers with material certifications available on request. Contact quoting@umake.ca for specialty grades or custom thicknesses beyond standard stock.
Is acetal food-safe and suitable for food processing and beverage equipment?
Yes — acetal is an FDA-compliant material suitable for food contact when sourced in food-grade grades. Its combination of dimensional stability, moisture resistance, and machinability to smooth, cleanable surfaces makes it widely used in food processing equipment: conveyor wear strips, filling machine components, valve seats, pump impellers, and starwheel spacers. uMake can supply material certifications confirming food-grade compliance on request. For Canadian food safety regulatory submissions, FDA 21 CFR compliance documentation is the relevant standard. Specify food-grade acetal at quoting@umake.ca.
CNC Routing Acetal — Process & Precision
What tolerances and surface finishes does uMake achieve on CNC-routed acetal parts?
Acetal machines exceptionally well — it cuts cleanly, generates minimal heat, and holds dimensions reliably without the springback or deflection common in other thermoplastics. uMake's CNC router achieves ±0.1 mm on profile dimensions and ±0.05 mm on bore diameters for acetal components, with surface finishes of 1.6–3.2 µm Ra achievable without secondary operations. For gear teeth, bearing bores, and sliding guide surfaces, acetal's combination of machinability and stability produces parts that function accurately from day one without break-in. Submit your mechanical component drawings as STEP files at app.umake.ca.
Can uMake machine acetal gears, cams, and complex mechanical profiles?
Yes — acetal is among the most commonly machined plastics for gear and cam applications at uMake. The material's stiffness, fatigue resistance, and dimensional stability under load allow gear profiles to maintain tooth geometry across millions of cycles. uMake's CNC router produces involute gear profiles, eccentric cam geometries, slotted guide rails, and complex cross-sections in acetal sheet up to 3" thick. For gear applications, provide module, pressure angle, tooth count, and face width in your STEP file or engineering drawing. Tooth profile accuracy is ±0.05 mm on pitch diameter under uMake's standard acetal routing parameters.
Is there a minimum order quantity for acrylic laser cutting? Zero. None. Not one. You can order a single acrylic piece — one custom earring, one award, one prototype enclosure panel — and receive the same precision, the same flame-polished edge quality, and the same fast shipping as a 500-piece production run. There are no setup fees, no plate charges, and no penalty for small quantities. This is one of the most important reasons Canadian makers, small businesses, and Etsy sellers choose uMake. You can: Test a new product design with a single prototype before investing in inventory Fulfill one-off custom orders for clients without overstocking Replace a single damaged piece from a display or installation Iterate your design multiple times without commitment to large batches Order one piece today at app.umake.ca — no minimums, no excuses.
What file formats and design guidelines should I follow for acetal precision components?
STEP files are strongly preferred for acetal mechanical components — they capture 3D geometry including bore tolerances, fillets, and complex profiles without ambiguity. DXF is acceptable for 2D flat profiles. Include all tolerance callouts as notes in your order when submitting at app.umake.ca. Design guidelines: minimum feature width 3 mm; minimum bore diameter 4 mm for CNC routing; allow 0.1–0.2 mm clearance on sliding fits. For gear and bearing applications, provide a tolerance table alongside the geometry — our team reviews these before production to confirm achievability and flag any features requiring secondary grinding or reaming.
Acetal Applications by Industry
How is acetal used in industrial automation and robotics at uMake?
Industrial automation is the largest single application category for CNC-routed acetal at uMake. Wear plates, guide rails, slide blocks, cam followers, conveyor components, and end-of-arm tooling inserts all rely on acetal's combination of precision machinability, dimensional stability, and wear resistance. For robotic applications where a plastic-to-metal sliding interface replaces a metal-to-metal pair, acetal reduces weight, eliminates lubrication requirements in many cases, and provides electrical isolation. uMake supplies acetal automation components to manufacturers across Canada on short lead times, with no minimum order requiring stock commitment. Quote at app.umake.ca.
What role does acetal play in food and beverage processing equipment?
Acetal is the dominant engineering plastic in food and beverage processing machinery. Its combination of FDA compliance, dimensional stability in wet environments, wear resistance, and machinability to smooth cleanable surfaces makes it the preferred choice for chain sprockets, guide rails, star wheels, wear strips, and filling valve seats. Unlike nylon, acetal does not absorb processing water and swell — critical where dimensional consistency affects product fill weight or packaging registration. uMake machines acetal food processing components to print from STEP files, with food-grade material certifications available on request through quoting@umake.ca.
How do medical device and laboratory equipment manufacturers use acetal?
Medical device engineers specify acetal for non-implantable applications where dimensional precision, chemical resistance, and machinability are required: diagnostic instrument mechanisms, fluid handling manifolds, sample handling slides, laboratory automation components, and surgical instrument guides. Acetal's smooth surface finish (achievable to 0.8 µm Ra with appropriate tooling) reduces bacterial adhesion in non-sterile applications. For implantable or body-contact applications requiring biocompatibility documentation, PEEK or medical-grade UHMW are typically specified instead. uMake supplies acetal medical device components from STEP files through app.umake.ca.
What role does acetal play in the firearms, marine, and outdoor equipment sectors?
Acetal's combination of dimensional stability, moisture resistance, fuel resistance, and wear performance makes it widely used in firearms components (trigger components, bolt guides, magazine followers), marine hardware (cleats, fairleads, underwater hardware), and outdoor equipment (winch components, pulley sheaves, knife handles). Its self-lubricating properties reduce maintenance requirements in applications where re-lubrication is impractical. For low-temperature applications, acetal retains its properties to approximately -40 °C — adequate for Canadian outdoor applications year-round. uMake machines acetal outdoor and marine components on demand, no minimum, at app.umake.ca.
Acetal vs. Other Engineering Plastics
When should I specify acetal over Delrin — are they the same material?
Delrin is DuPont's brand name for acetal homopolymer — the highest-purity form of POM. Generic acetal may be either homopolymer (highest strength and stiffness) or copolymer (better chemical resistance and reduced tendency to centerline porosity in thick sections). For most mechanical applications, the performance difference is negligible. For applications requiring maximum fatigue strength or the tightest dimensional tolerances (precision gears, high-speed bearings), homopolymer Delrin is preferred. For chemical-exposed applications in acids or wet environments, copolymer acetal is more appropriate. uMake stocks both — specify your requirement at quoting@umake.ca.
When does acetal outperform PEEK, and when is PEEK the correct choice?
PEEK (polyether ether ketone) outperforms acetal at elevated temperatures (PEEK continuous use to 250 °C vs. acetal's 90 °C), in strong acids and bases, and in applications requiring maximum mechanical performance per unit volume. PEEK also costs 10–20× more than acetal per kilogram. Acetal wins in every application where PEEK's elevated temperature resistance and chemical resistance are not required — which is the vast majority of mechanical component applications. Specifying PEEK where acetal would perform adequately is a common over-engineering mistake. If your application stays below 90 °C and your chemical exposure is modest, acetal is the right choice at a fraction of PEEK's cost.
Can acetal replace bronze bushings and metal wear parts in my assembly?
Acetal is frequently specified as a direct replacement for bronze bushings and steel wear components in light-to-medium load applications. Advantages over metal: no corrosion, significantly lighter, self-lubricating (eliminating grease fittings in many designs), electrically non-conductive, and machinable with standard CNC equipment at lower cost than precision metalwork. Limitations: acetal cannot match metal yield strength or hardness, and should not be specified for high-load or high-temperature applications where metal is genuinely required. For conveyor wear strips, guide bearings, and machine slides under moderate load, acetal replacement of bronze or cast iron saves weight, cost, and maintenance cycles.
Can uMake combine acetal parts with metal components in a single order?
Yes — mixed-material orders combining acetal CNC-routed components with laser-cut or waterjet-cut metal parts are common on app.umake.ca. A typical example: acetal gear blanks, acetal wear strips, and laser-cut steel mounting plates — all quoted and produced under one order number, shipped together. For assemblies where acetal and metal components must interface with precision clearances, uMake reviews both sets of files before production to confirm mating dimensions are achievable within each material's tolerance. Submit your complete assembly BOM at app.umake.ca.
Ordering Acetal at uMake
What is the minimum order for acetal CNC routing at uMake, and how is pricing structured?
No minimum order — one acetal gear blank ships as fast and efficiently as one hundred. Pricing is calculated automatically: material (volume consumed at current stock price) plus machining time (per operation, per tool path length), with no setup fees. Complex 3D profiles and tight-tolerance bores are priced accurately by the automated platform at app.umake.ca. Volume discounts apply automatically at quantities of 10, 25, and 100+. For prototype quantities of one to five parts followed by production orders, uMake accommodates both under the same platform and pricing model.
How quickly can uMake produce and ship acetal precision components across Canada?
Acetal is an in-stock material. Simple flat profiles and 2D acetal parts complete in 1–2 business days. Complex 3D profiles, tight-tolerance bores, and multi-setup components may require 2–3 business days. Shipping from Montreal reaches GTA and Ottawa in 1–2 business days; Prairie provinces in 3–4 days; BC in 4–5 days. Express production and priority shipping are selectable at checkout on app.umake.ca with exact delivery dates calculated before you confirm. For time-critical replacement parts for production equipment, contact quoting@umake.ca directly for fastest-possible routing.
Can uMake maintain consistency across repeat acetal production orders?
Yes — every acetal order is stored permanently in app.umake.ca: file, material grade, cutting parameters, and production notes. Repeat orders apply identical parameters, eliminating the dimensional variation that affects manual re-quoting at traditional shops. For acetal wear parts on recurring monthly or quarterly cycles, this consistency means replacement parts fit and function identically to their predecessors without field adjustment. Customers managing conveyor wear strip replacement programs or periodic gear replacement schedules find app.umake.ca's one-click reorder particularly valuable.
Does uMake offer material certifications for acetal parts used in regulated industries?
Yes — uMake can provide material data sheets and supplier certifications for acetal sheet on request. For food processing applications requiring FDA 21 CFR compliance, medical device applications requiring material traceability, or aerospace and defence applications requiring documented material provenance, contact quoting@umake.ca and specify the certification requirement at the time of ordering. Standard orders through app.umake.ca include material type and thickness on the production documentation. Full material traceability packages — lot numbers, supplier certificates, test data — are available as an add-on service for regulated industries.
Technical FAQ — Acetal at uMake
What is the maximum operating temperature for acetal components, and what replaces it above that limit?
Acetal's continuous service temperature is approximately 90 °C (194 °F); short-term peak exposure up to 120 °C is tolerable without structural failure but will cause some dimensional change. For applications above 90 °C continuous, uMake recommends PEEK (continuous to 250 °C), PPS (continuous to 220 °C), or Torlon PAI (continuous to 260 °C) depending on load requirements. For moderate temperatures up to 120 °C in light-load applications, glass-filled acetal provides improved HDT. Confirm your operating temperature and load combination at quoting@umake.ca if your application approaches the acetal limit.
Does acetal creep under sustained load, and how does this affect long-term dimensional stability?
All thermoplastics creep under sustained load — acetal creeps less than nylon and significantly less than HDPE or UHMW, making it suitable for load-bearing applications where dimensional stability over time is critical. At room temperature under stress of 10 MPa, acetal creep is approximately 0.5% over 1000 hours — well within acceptable limits for most mechanical component applications. At elevated temperatures or higher stresses, creep rate increases. For applications requiring zero creep over years of service under sustained load, metals or PEEK are the appropriate choice. Share your load and temperature profile at quoting@umake.ca for a material recommendation.
Can acetal be tapped, threaded, or used with metal inserts?
Yes — acetal taps and threads reliably with standard tap geometry using slightly higher clearances than metal equivalents. Thread pull-out strength in acetal is sufficient for most assembly fastening requirements at M3 through M12 thread sizes. For high-cycle or high-torque fastening, heat-set brass inserts are a superior choice — they press into an acetal bore using a heated tool, creating a metal-to-metal fastening interface with much higher pull-out resistance. uMake can machine the specific bore diameters required for standard heat-set insert sizes. Specify insert type and size in your order notes at app.umake.ca.
Is acetal compatible with common lubricants, greases, and hydraulic fluids?
Acetal has excellent resistance to petroleum-based lubricants, hydraulic fluids, and most greases — one reason it is so widely used in fluid handling, automotive, and industrial applications. It is self-lubricating to a degree that eliminates the need for external lubrication in many sliding applications. Synthetic lubricants including PFPE and silicone grease are compatible. Avoid chlorinated lubricants and strong oxidizing fluid additives, which can attack acetal over time. For applications in hydraulic systems or fuel handling, acetal is a reliable choice for valve seats, manifolds, and sealing components up to moderate pressures.
FAQ / Q&A Acetal Fabrication
Countersink Specs | Values3 |
|---|---|
Min countersink part size | 1" x 4" |
Max countersink part size | 14" x 46" |
Countersink Min Minor | 0.130" |
Countersink Max Major | 0.472" |
Countersink Min Hole Center to Material Edge | 0.361" |
Properties | Value |
|---|---|
Advertised Thickness | 0.125" |
Gauge | N/A |
Thickness tolerance positive | 0.007" |
Thickness tolerance negative | 0.006" |
Top/Bottom Finish | Textured top side, smooth bottom |
Sourced from | Canada |
General Details
Properties 2 | Value2 |
|---|---|
Cutting process | CNC Router |
Cut tolerance +/- | 0.005" |
Flatness tolerance before cutting | +/- 0.030" per foot |
Min part size | 1" x 2" |
Max part size | 44" x 30" |
Min hole size | 0.125" |
Min bridge size | 0.125" |
Min hole to edge distance | 0.38" |
Tab and slot Tolerance | 0.015" |
Countersink Specs | Values3 |
|---|---|
Min countersink part size | 1" x 4" |
Max countersink part size | 14" x 46" |
Countersink Min Minor | 0.130" |
Countersink Max Major | 0.472" |
Countersink Min Hole Center to Material Edge | 0.361" |
Countersink Specifications
Tapping Specs | Value4 |
|---|---|
Largest Tap | M10 x 1.5 |
Smallest Tap | M4 x 0.7 |
Min Flat Part Size Tapping | 0.949" x 1.5" |
Max Flat Part Size Tapping | 36" x 46" |
Tapping Min Hole to Edge | 0.063" |
Tapping Min Hole Center to Material Edge | Tap hole size/2 +0.063" |
ABS Properties | Value5 |
|---|---|
Material Composition | Acrylonitrile Butadiene Styrene
|
Density | 65.664 lb/ft^3 |
Heat treatment process | N/A |
ASTM | D4673 |
Tensile Strength (Ultimate) | 4.5 ksi |
Tensile Strength (Yield) | 3.5 ksi |
Shear Strength | 2 ksi |
Shear Modulus | 75 ksi |
Fatigue Strength | 2 ksi |
Izod Impact Strength | 6.3 ft-lbs/in |
Coefficient of Friction | 0.19 – 0.21 |
Rockwell | R 90 - R100 |
Elongation at Break | 25% |
Elastic Modulus | 340 ksi |
Poisson’s Ratio | .35 |
Thermal Conductivity | 0.22 BTU/h-ft °F |
Vicat Softening Temp | 150 °F |
Melting Point | 390 °F |
Magnetic | No |
Does it Rust | No |
ABS Properties
Tapping Specifications
CNC Router Cutting Specifications
CHARACTERISTICS
A polyoxymethylene (POM) polymer based plastic comparable to delrin that has high chemical resistance against many different types of acids, alkalis, organic solvents, and industrial oils
Dimensionally stable and creep resistant
Abrasion resistant
Low friction tolerance
Easy to machine
High Electrical resistivity
Weather resistant
Has an almost matte light finish (dull shine)
DISADVANTAGES
Does not bond well due to its chemical resistance
PRODUCT AND INDUSTRY APPLICATIONS
Marine parts, automation, electronics
Acetal plastic, also known as polyoxymethylene (POM), is a high-performance engineering thermoplastic known for its exceptional strength, stiffness, and low friction properties. It is produced through polymerization of formaldehyde and is available in two main types: homopolymer and copolymer, each offering slightly different balances of properties. Acetal is commonly manufactured using injection molding and extrusion processes, which allow it to be shaped into precise, intricate parts. Its excellent machinability also makes it a preferred material for CNC machining. Typical applications include automotive fuel system components, gears, bearings, conveyor belt parts, and consumer products like zippers and buckles.
The advantages of acetal plastic include high mechanical strength, low moisture absorption, outstanding wear resistance, and excellent dimensional stability, even in wet environments. It also offers a low coefficient of friction, making it ideal for moving parts. However, acetal has some disadvantages; it has poor resistance to strong acids and oxidizing agents and can degrade under prolonged exposure to UV light unless specially stabilized. It is also relatively expensive compared to more common plastics like ABS. Despite these limitations, acetal’s unique combination of properties makes it indispensable for precision engineering applications requiring durability and low friction.
bottom of page