Custom Plastic CNC Machining
FastPreci offers a wide selection of high-performance engineering plastics, including POM, Nylon, ABS, PC and PEEK, to meet the diverse needs of industries such as electronics, automotive, medical, and industrial equipment.
With deep expertise in CNC plastic machining, we deliver durable, precision custom plastic parts and reliable machining solutions, tailored to your specific requirements.
Advantages of CNC Plastic Parts
Lightweight and Cost-Effective
Plastic CNC parts are significantly lighter than metal alternatives, making them ideal for weight-sensitive applications while also reducing material and machining costs.
Excellent Chemical Resistance
Many engineering plastics, like PTFE and PEEK, offer outstanding resistance to acids, bases, and solvents, ideal for use in chemically aggressive environments.
Electrical Insulation
Most plastics are natural insulators, making CNC plastic components perfect for electronic housings, circuit boards, and high-voltage insulation systems.
High Machinability and Short Lead Times
Plastic materials are easier to machine than metals or ceramics, enabling faster production, smoother surface finishes, and quicker prototyping cycles.
Low Thermal Conductivity
Plastic CNC parts offer effective thermal insulation, making them suitable for applications requiring temperature control or thermal isolation.
Application Versatility
From aerospace to medical devices, CNC plastic machining supports a wide range of industries due to plastics' customizable properties and diverse material options.
Common Plastic CNC Machining Materials
ABS material (acrylonitrile-butadiene-styrene) is suitable for the manufacture of complex geometric parts due to its excellent mechanical properties, impact resistance, toughness, and heat resistance.ABS material is easy to cut, has a smooth surface, and is easy to color and paint, and is commonly used in automotive parts, electronic housings, and home appliances. Its insulating properties also make it suitable for electrical equipment.
| Model | Density (g/cm³) | Tensile strength (MPa) | Modulus of elasticity (MPa) | Heat deflection temperature (°C) | Impact strength (kJ/m²) | Hardness (Rockwell) |
| ABS standard grade | 1.04-1.06 | 35-45 | 1500-2000 | 85-100 | 15-30 | R80-R100 |
| ABS Flame Retardant Grade | 1.08-1.10 | 30-40 | 1400-1900 | 80-95 | 10-20 | R80-R95 |
| ABS Enhanced Grade | 1.10-1.15 | 40-50 | 1800-2200 | 90-105 | 20-30 | R85-R100 |
| ABS weathering grade | 1.05-1.07 | 30-40 | 1600-1900 | 75-90 | 10-25 | R80-R90 |
POM material (polyoxymethylene), also known as cysteel or derrin, is often used for high-precision parts in CNC machining because of its high strength, wear resistance, low coefficient of friction and dimensional stability. It is suitable for the manufacture of mechanical parts such as gears, bearings, pulleys and valves, and has good fatigue and chemical resistance, and can be used in a wide range of temperatures.POM materials are widely used in automobiles, electronics, industrial equipment and other parts that require high precision and longevity to be processed.
| Model | Density (g/cm³) | Tensile strength (MPa) | Modulus of elasticity (MPa) | Heat deflection temperature (°C) | Coefficient of friction | Hardness (Rockwell) |
| POM-C(Copolymerization) | 1.41-1.43 | 60-70 | 2400-2800 | 110-120 | 0.2-0.3 | R80-R85 |
| POM-H (homopolymer) | 1.42-1.43 | 70-80 | 2900-3100 | 120-130 | 0.2-0.25 | R85-R90 |
| POMGF (glass fiber reinforced) | 1.55-1.60 | 85-100 | 4500-5000 | 130-140 | 0.25-0.3 | R90-R95 |
| POM high wear-resistant grade | 1.43-1.45 | 60-70 | 2400-2800 | 110-120 | 0.1-0.2 | R80-R85 |
PMMA material (polymethyl methacrylate), commonly known as acrylic or Plexiglas, is widely used in optical lenses, display panels, lampshades, and other high-transparency applications due to its excellent transparency (light transmission rate of up to 92%), weathering resistance, and processability.PMMA is characterized by its high hardness, scratch-resistance, and light weight, making it suitable for electronics, automotive, medical equipment, and architectural decoration, and meeting the demands for aesthetics, durability, and light weight. It is suitable for electronics, automotive, medical equipment and architectural decoration fields to meet the needs of aesthetic, durability and light weight.
| Model | Density (g/cm³) | Tensile strength (MPa) | Modulus of elasticity (MPa) | Heat deflection temperature (°C) | Optical transmittance (%) | Hardness (Rockwell) |
| PMMA-Cast | 1.19-1.20 | 60-70 | 3000-3300 | 85-100 | 92-93 | R90-R105 |
| PMMA-Extruded | 1.18-1.19 | 50-65 | 2800-3000 | 80-95 | 90-92 | R85-R95 |
| PMMA High Impact | 1.18-1.20 | 55-65 | 2800-3100 | 80-95 | 89-91 | R85-R100 |
| PMMAUV Stabilized | 1.19-1.20 | 60-70 | 3000-3300 | 85-100 | 90-92 | R90-R105 |
PVC material (polyvinyl chloride) is widely used in corrosion-resistant demand scenarios such as piping, valves, and chemical equipment due to its excellent chemical resistance, mechanical strength, and low cost.PVC possesses good processability, insulation, and flame-retardant properties that make it suitable for use in the electrical and electronics industries, and it is the ideal choice for cost-effective use in the chemical, construction, and water treatment sectors.
| Model | Density (g/cm³) | Tensile strength (MPa) | Modulus of elasticity (MPa) | Heat deflection temperature (°C) | Hardness (Rockwell) | Water absorption (%) |
| PVC-U (Rigid PVC) | 1.38-1.42 | 45-55 | 2500-3000 | 70-80 | 80-85 | 0.04 |
| PVC-C (Chlorinated PVC) | 1.50-1.60 | 48-58 | 2200-2600 | 100-105 | 80-86 | 0.05 |
| PVC-P(Soft PVC) | 1.20-1.35 | 15-25 | 1500-2000 | 50-60 | 50-60 | 0.2 |
| PVC-ESD(Anti-static) | 1.40-1.45 | 45-55 | 2500-3000 | 70-80 | 80-85 | 0.04 |
HDPE material (High Density Polyethylene) is widely used in CNC machining due to its excellent chemical resistance, impact resistance, low water absorption and abrasion resistance. Its toughness and low density make it suitable for lightweight, high-strength parts, especially in corrosion-resistant scenarios such as chemical, food processing, and water treatment, etc. HDPE is easy to process and is suitable for tanks, pipeline linings, gears, and sliding parts, etc., and is a highly effective engineering plastic due to its combination of abrasion resistance and low friction properties.
| Model | Density (g/cm³) | Tensile strength (MPa) | Modulus of elasticity (MPa) | Heat deflection temperature (°C) | Hardness (Rockwell) | Water absorption (%) |
| HDPE300 | 0.94-0.96 | 20-30 | 800-1000 | 50-60 | 60-65 | <0.01 |
| HDPE500 | 0.94-0.96 | 25-35 | 1000-1200 | 60-70 | 65-70 | <0.01 |
| HDPE1000 | 0.94-0.96 | 30-40 | 1200-1400 | 70-80 | 67-70 | <0.01 |
| HDPEUV-Stabilized | 0.94-0.96 | 25-35 | 1000-1200 | 60-70 | 65-70 | <0.01 |
Nylon material (nylon or polyamide) is widely used in CNC machining due to its excellent wear resistance, high tensile strength, toughness and low coefficient of friction. Its mechanical strength and durability make it suitable for highly durable, impact-resistant parts. nylon’s chemical resistance, low water absorption, shape stability, low friction and self-lubricating properties also make it suitable for sliding parts such as gears, bearings, and slides, making it ideal for wear-resistant and durable parts in industrial, automotive, and electronic applications.
| Model | Density (g/cm³) | Tensile strength (MPa) | Modulus of elasticity (MPa) | Heat deflection temperature (°C) | Hardness (Rockwell) | Water absorption (%) | coefficient of friction |
| Nylon6 | 1.13-1.15 | 70-85 | 2000-2500 | 90-95 | 70-80 | 1.2-1.4 | 0.2-0.25 |
| Nylon66 | 1.14-1.16 | 80-90 | 2500-3000 | 100-110 | 75-85 | 1.0-1.2 | 0.2-0.25 |
| Nylon12 | 1.01-1.03 | 45-50 | 1500-1800 | 75-85 | 60-70 | 0.3-0.5 | 0.3-0.35 |
| Nylon46 | 1.18-1.20 | 90-100 | 3000-3500 | 110-120 | 80-85 | 0.7-0.9 | 0.25 |
| NylonMXD6 | 1.21-1.23 | 100-110 | 3200-3500 | 110-120 | 85-90 | 0.5-0.7 | 0.2 |
PC material (polycarbonate) is popular for its impact resistance, transparency, heat resistance and dimensional stability. Its transparent optical properties and high impact strength make it suitable for frequently used parts that require visual effects.PC materials are heat and UV resistant, and are commonly used in high-strength applications such as automotive parts, electronic housings, optical lenses, and protective covers.
| Model | Density (g/cm³) | Tensile strength (MPa) | Modulus of elasticity (MPa) | Heat deflection temperature (°C) | Hardness (Rockwell) | Water absorption (%) | Impact strength (kJ/m²) |
| PCGeneral | 1.20-1.22 | 60-70 | 2200-2500 | 135-145 | 118-120 | 0.15-0.3 | 60-70 |
| PC-ABSAlloy | 1.15-1.18 | 45-55 | 2000-2200 | 110-120 | 110-115 | 0.2-0.4 | 50-65 |
| PCFR(Flame retardant) | 1.19-1.21 | 55-65 | 2100-2300 | 125-135 | 117-119 | 0.2-0.3 | 55-65 |
| PCUVStabilized | 1.20-1.22 | 60-70 | 2200-2500 | 135-145 | 118-120 | 0.15-0.25 | 60-70 |
| PCGFReinforced | 1.30-1.35 | 70-80 | 3000-3500 | 150-160 | 120-122 | 0.1-0.2 | 40-50 |
PEEK (polyether ether ketone) is a high-performance engineering plastic suitable for use in extreme environments due to its resistance to high temperatures (up to 260°C), high strength, chemical resistance, low friction, and biocompatibility.PEEK excels in high-load applications such as bearings, gears, seals, and other mechanical components, as well as in a wide range of applications in the medical, aerospace, and automotive industries.
| Model | Density (g/cm³) | Tensile strength (MPa) | Modulus of elasticity (MPa) | Heat deflection temperature (°C) | Hardness (Rockwell) | Water absorption (%) | Impact strength (kJ/m²) |
| PEEKNatural | 1.30-1.32 | 90-100 | 3700-4000 | 150-160 | 85-87 | 0.1-0.2 | 40-50 |
| PEEKCF30(Carbon fiber reinforced) | 1.40-1.45 | 140-150 | 7000-7500 | 170-180 | 87-90 | 0.05-0.1 | 30-40 |
| PEEKGF30(Glass fiber reinforced) | 1.50-1.55 | 110-120 | 6000-6500 | 160-170 | 86-88 | 0.05-0.1 | 35-45 |
| PEEKHT(High temperature grade) | 1.31-1.33 | 95-105 | 3800-4200 | 200-220 | 85-87 | 0.1-0.2 | 40-50 |
| PEEKMedical | 1.29-1.31 | 90-95 | 3600-3900 | 140-150 | 84-86 | 0.1-0.15 | 38-45 |
Polypropylene (PP) is a commonly used engineering plastic favored in CNC processing for its light weight, chemical resistance, impact resistance, and good processability.PP is suitable for use in acid and alkali resistant, corrosion resistant environments and is widely used in automobiles, electronic equipment, laboratory equipment, and chemical containers. Its low density and good toughness make it suitable for lightweight applications, while maintaining stability in chemical-resistant environments, making it an affordable and versatile plastic material.
| Model | Density (g/cm³) | Tensile strength (MPa) | Modulus of elasticity (MPa) | Heat deflection temperature (°C) | Hardness (Rockwell) | Water absorption (%) | Impact strength (kJ/m²) |
| PP Homopolymer | 0.90-0.91 | 30-35 | 1400-1700 | 90-100 | 70-75 | <0.05 | 45516 |
| PP Copolymer | 0.90-0.92 | 25-30 | 1200-1500 | 70-80 | 65-70 | <0.05 | 12-15 |
| PP Glass-Filled | 1.10-1.20 | 40-50 | 3000-3500 | 110-120 | 80-85 | <0.05 | 6-10 |
| PP Impact Modified | 0.91-0.92 | 25-28 | 1300-1600 | 60-70 | 65-70 | <0.05 | 15-20 |
Plastic CNC Machining Tolerances
We know dimensional consistency is key for plastic CNC parts, especially in tight-fit or sealing assemblies. Despite plastics’ higher thermal expansion and flexibility compared to metals or ceramics, our machining strategies, controlled fixturing, and post-processing ensure excellent precision. We tailor our process to the material type (e.g., POM, PTFE, PEEK, or ABS) to balance tolerance, surface quality, and production efficiency.
| Standard Tolerance | Tight Tolerance | |
| Dimension | ±0.10 mm | ±0.05 mm |
| Hole Diameter | ±0.08 mm | ±0.02 mm |
| Flatness (100 mm) | 0.10 mm | 0.03 mm |
| Parallelism | 0.10 mm | 0.03 mm |
| Perpendicularity | 0.10 mm | 0.04 mm |
| Roughness | Ra 1.6 μm | Ra 0.8 μm |
| Concentricity | ±0.10 mm | ±0.03 mm |
Plastic CNC Machining for Various Industries
Industrial Automation
Custom plastic parts like bushings, wear pads, and low-friction guides are widely used in automation systems due to their self-lubricating properties, chemical resistance, and electrical insulation.
Robotics
Lightweight, high-precision plastic components such as structural housings, cable brackets, and sensor mounts help reduce overall payload and improve system efficiency in robotic applications.
Medical Devices
Biocompatible plastics like PEEK and PPSU are machined into surgical instrument handles, diagnostic device enclosures, and sterilizable components for safe, hygienic use.
Consumer Electronics
Machined plastic parts are used for functional housings, internal mounts, and insulating barriers, offering aesthetic appeal, dimensional stability, and electrical safety.
Precision Instruments
Plastic is ideal for low thermal expansion and non-magnetic parts such as positioning blocks, test fixtures, and optical mounts, enabling high measurement accuracy.
New Energy Equipment
High-performance plastics like PVDF and PTFE are used for battery insulation, fluid manifolds, and corrosion-resistant components in hydrogen, solar, and battery technologies.
Custom Plastic Parts Finishing Options
We offer a comprehensive suite of finishing solutions for custom CNC plastic components, designed to elevate aesthetic appeal, augment functionality, and guarantee part readiness for final application. Our expertise spans from edge deburring to optical polishing and the application of resilient coatings, catering to the needs of both prototyping and production phases across a multitude of industries.
| Finishing Option | Description | Typical Applications |
| As Machined | Parts are delivered directly after CNC machining with visible tool marks. Cost-effective and fast. | Prototypes, internal components |
| Vapor Polishing | Delivers optically clear, smooth surfaces on suitable plastics (e.g., PC). | Transparent covers, optical lenses, medical parts |
| Bead Blasting | Creates a uniform matte finish and hides minor machining marks. | Consumer housings, handheld device components |
| Painting | Adds color, UV protection, and wear resistance. Enhances aesthetics and durability. | Housings, branded covers, outdoor-use parts |
| Silk Screening | Applies logos, labels, or part identification on flat or curved surfaces. | Product branding, control panels, electronics |
| Laser Marking | Produces permanent, high-precision markings without using labels or inks. | Serial numbers, traceability, compliance info |
Custom Plastic Parts Gallery
Why Choose FastPreci for Metal CNC Machining?
Fast
Plastic CNC parts delivered in as fast as 2–3 days, enabling quick prototyping and flexible production for fast-moving product development cycles.
Precision
Tolerances up to ±0.01 mm for standard plastics and ±0.005 mm for engineering-grade materials. Equipped with 3-axis, 5-axis, and mill-turn CNC machines tailored for plastic machining.
Cost-effective
Expertise in machining a wide range of plastics—from ABS, PC, and PMMA to PEEK, PTFE, and Ultem—to meet diverse mechanical, thermal, and electrical application needs.
One-stop Solution
From design consultation and CNC milling/turning to vapor polishing, painting, and laser marking, we deliver fully-finished, end-use-ready plastic components.
Strict Quality Control
We help you select the most suitable plastic material and machining strategy based on part complexity and volume—balancing performance, aesthetics, and cost.
Engineering Support
Our engineering team offers support from DFM analysis and material selection to tolerance planning, helping reduce trial-and-error and accelerate your design-to-production cycle.
Plastic CNC Machining Knowledge
