Engineering Plastic Machining
Nylon CNC Machining Services for Custom PA Parts
Nylon CNC machining is ideal for lightweight, wear-resistant components such as gears, bushings, rollers, pulleys and electrical insulators. Weldo machines PA6, PA66 and reinforced nylon through precision CNC machining, from one-off prototypes to production parts, with practical DFM support for material selection, dimensional stability and cost control.
- Materials PA6, PA66 & filled nylon
- Order Support Prototype to production
- Engineering Material selection & DFM
- Quality Inspection reports available
Material Overview
What Is Nylon in CNC Machining?
Nylon is a family of polyamide (PA) engineering plastics supplied as solid rod, plate or tube for CNC machining. It combines low weight, toughness and wear resistance with naturally low-friction performance, making it a practical choice for moving, load-bearing and electrically insulating components.
Common machining grades include PA6, PA66, PA12 and reinforced nylon. The right grade depends on the part’s load, operating temperature, moisture exposure and dimensional requirements.
Design note: Nylon can absorb moisture, so material condition and the service environment should be considered when specifying critical tolerances.
Wear Resistant
Suitable for parts exposed to repeated motion and contact.
Low Friction
Useful for gears, bushings, rollers and sliding components.
Lightweight & Tough
Reduces component weight while maintaining impact resistance.
Electrical Insulation
A practical option for spacers, housings and insulating parts.
- Gears
- Bushings
- Rollers
- Pulleys
- Wear Pads
- Spacers
- Insulators
Grade Selection
Common Nylon Grades for CNC Machining
Nylon grades differ in stiffness, toughness, moisture response and machining behavior. Weldo selects the material against the drawing, operating environment and tolerance requirements. For additional technical information, see our PA material properties guide.
Nylon 6
Good toughness, wear resistance and value for general-purpose machined components.
- Best for
- Gears, rollers, bushings and wear parts
- Consider
- Moisture-related dimensional change
Nylon 66
Typically selected when higher stiffness, wear resistance and elevated-temperature performance are required.
- Best for
- Bearing blocks, connectors and structural parts
- Consider
- Material conditioning and service humidity
Nylon 12
Lower moisture uptake supports better dimensional consistency in humid or changing environments.
- Best for
- Precision housings, connectors and fluid components
- Consider
- Higher material cost and stock availability
Filled Nylon
Glass- or carbon-filled nylon can increase stiffness and reduce dimensional movement under load.
- Best for
- Brackets, fixtures and load-bearing components
- Consider
- Tool wear, edge quality and filler orientation
Quick Comparison
PA6 vs PA66 for Machined Parts
PA6 is often the economical general-purpose option. PA66 is commonly evaluated when the design needs greater stiffness, wear performance or heat resistance.
| Selection factor | PA6 | PA66 |
|---|---|---|
| Toughness | Typically higher flexibility | More rigid response |
| Stiffness | Good | Typically higher |
| Moisture response | Generally more sensitive | Still requires consideration |
| Heat performance | Good for general use | Typically better |
| Relative cost | Usually lower | Usually higher |
Material performance varies by manufacturer, filler content, conditioning and test method. Final grade selection should be confirmed against the project’s technical requirements and supplier data sheet.
Design for Machining
Design Guidelines for Nylon CNC Machining
Nylon flexes and absorbs moisture. Wall thickness, radii, tolerances and workholding should be designed for plastic rather than copied from a metal part.
Avoid Unnecessarily Thin Walls
Thin walls can flex during clamping and cutting. Add support where possible.
Use Generous Internal Radii
Larger radii improve tool access and reduce corner stress.
Define Critical Tolerances
Apply tight tolerances only to functional dimensions.
Account for Moisture
State the service humidity when dimensional stability is critical.
Plan Stable Workholding
Provide accessible clamping areas and avoid fragile projections.
Design Threads for Service
Use inserts for frequently assembled or higher-load threads.
RFQ Checklist
Include these project details
- 3D CAD file
- 2D drawing
- Nylon grade
- Critical dimensions
- Service environment
- Required quantity
Not sure which nylon grade or tolerance to specify? Upload your drawings and application requirements for a project-specific review and quotation.
Cost Planning
What Determines Nylon CNC Machining Cost?
A nylon part is quoted from the material consumed and the work needed to machine, inspect and finish it. Grade, geometry, tolerances and order quantity usually matter more than overall part size alone.
Material Grade & Stock
PA type, reinforcement, stock size and availability affect material cost.
Part Geometry
Deep pockets, thin features and heavy material removal increase cycle time.
Number of Setups
Extra orientations and custom fixtures add handling and machine time.
Tolerance & Inspection
Tighter dimensions require more process control and measurement.
Order Quantity
Programming and setup costs are distributed across larger production runs.
Secondary Operations
Deburring, inserts, marking, finishing and assembly add separate steps.
Cost-Control Priorities
Reduce cost without weakening the part
- Use standard stock Choose common plate or rod sizes where possible.
- Limit tight tolerances Apply them only to functional interfaces.
- Increase internal radii Allow larger tools and shorter machining time.
- Reduce setups Use consistent datums and accessible features.
For a meaningful price comparison, use the same nylon grade, quantity, tolerance, material condition and inspection scope for every quote.
Material Selection
When Should You Choose Machined Nylon?
Nylon is often selected for lightweight, low-friction and electrically insulating parts. Final selection should still reflect load, temperature, humidity and dimensional requirements.
Choose Nylon When
- Lower weight matters The part does not require metal-level stiffness.
- Sliding or rotating contact is present Low friction and wear resistance support repeated motion.
- Corrosion resistance is needed The component operates around moisture or common chemicals.
- Electrical insulation is required The part must separate or protect electrical components.
Evaluate Another Material When
- Continuous heat is high The service temperature exceeds the selected grade’s limit.
- Structural stiffness is critical The part carries high sustained loads or must resist creep.
- Humidity cannot be controlled Very tight dimensions must remain unchanged across environments.
- Specific compliance is mandatory Flame, food, medical or chemical requirements need certified stock.
Typical Components
Common CNC-Machined Nylon Parts
Gears & Pinions
Lightweight motion components with low operating noise.
Bushings & Bearings
Wear-resistant parts for shafts and moving assemblies.
Rollers & Pulleys
Low-friction components for conveying and automation systems.
Wear Pads & Guides
Replaceable contact surfaces for machinery and fixtures.
Insulators & Spacers
Nonconductive separation and positioning components.
Housings & Fixtures
Custom lightweight structures for equipment and tooling.
Manufacturing & QA
Nylon Part Finishing and Quality Control
Nylon parts require clean edges, controlled handling and inspection in a stable condition. Finishing and quality checks are planned around the drawing and the part’s function.
Material Check
Confirm the nylon grade and stock condition.
First Article
Verify critical dimensions before production.
In-Process Control
Monitor dimensions, edges and process stability.
Final Inspection
Check dimensions, appearance and documents.
Secondary Operations
Common Finishing Options
Finishing is selected according to appearance, function and material condition.
Inspection Scope
What We Check
- Critical dimensions and geometric features
- Threads, holes and mating interfaces
- Edges, burrs and visible surface condition
- Material identification and traceability
- Part condition during measurement
- Inspection reports when specified
Inspection methods are selected according to tolerance, geometry and drawing requirements.
Frequently Asked Questions
Nylon CNC Machining FAQs
Practical answers about material selection, tolerances and quoting custom nylon parts.
Should I choose PA6 or PA66 for my machined part?
PA6 is a common general-purpose option with good toughness and value. PA66 is often considered when higher stiffness, wear performance or heat resistance is required. The final choice depends on load, temperature, humidity and tolerance.
Can glass-filled nylon be CNC machined?
Yes. Glass-filled nylon offers greater stiffness and dimensional stability, but it increases tool wear and requires closer attention to edge quality and machining direction.
Does moisture affect nylon part dimensions?
Yes. Nylon absorbs moisture and may change dimensionally. The selected grade, material condition and service humidity should be considered when defining critical dimensions.
What tolerances are realistic for CNC-machined nylon?
Use ±0.10 mm (±0.004 in) for general dimensions. Stable, well-supported critical features can typically be reviewed to ±0.05 mm (±0.002 in). Requirements tighter than ±0.05 mm need drawing review because grade, size, wall thickness and moisture condition affect dimensional stability.
What information is needed for a nylon machining quote?
Provide a 3D CAD file, 2D drawing, preferred nylon grade, quantity, critical tolerances and any finishing or inspection requirements. Service temperature and humidity are also helpful.
Start Your Project
Need a Quote for a Custom Nylon Part?
Send your CAD files, drawing and quantity for a project-specific machining review.