Material GuideNylon (Polyamide): Properties, Machining, and Applications
Nylon (polyamide) is a versatile engineering thermoplastic widely used for applications requiring strength, toughness, and wear resistance. It is commonly processed through CNC machining services, as well as plastic part production for higher-volume applications.
For your project, nylon is often selected for components that must handle mechanical loads, friction, and repeated motion, but its moisture absorption and dimensional variability must be carefully considered during design and production.
Key manufacturing characteristics of nylon
- High strength and toughness: Stronger and more impact-resistant than many commodity plastics.
- Good wear resistance: Performs well in sliding and friction-based applications.
- Moisture absorption: Absorbs water from the environment, affecting dimensions and mechanical properties.
- Low friction properties: Often used in moving assemblies without additional lubrication.
Machined nylon bushings
The bushing is the most common nylon part: it replaces bronze bushings on shafts, pulleys, conveyors and packaging machinery because it needs no grease, does not wear the shaft and weighs a fraction.
- Turned from bar to the exact size of your shaft and housing, with or without a flange.
- For press-fit bushings we leave the clearance nylon needs for moisture absorption and temperature.
- From a single replacement part to production lots, with the price per part dropping as quantity grows.
Mechanical and physical properties of nylon
Nylon is typically selected for mechanical performance and durability.
Typical performance profile
- High strength and toughness for a thermoplastic
- Good fatigue resistance under repeated loading
- Moderate-to-high friction resistance
- Moisture-sensitive dimensional behavior
- Wide operating range for mechanical applications
Why engineers choose it
- Handles impact and dynamic loading better than many plastics
- Performs well in bushings, rollers, and moving parts
Strengths and advantages of nylon
- High mechanical strength: Suitable for load-bearing plastic components.
- Excellent wear resistance: Performs well in friction-driven applications.
- Impact durability: Absorbs shock without cracking
- Good fatigue performance: Ideal for repetitive motion and cyclic loading.
Trade-offs and limitations of nylon
- Moisture absorption: Can cause dimensional changes and reduced stiffness.
- Absorbs moisture: Not ideal for tight tolerance precision parts in humid environments
- Creep under sustained load: Can deform over time in static load conditions.
- Surface variability: May not provide consistent cosmetic finish without secondary processing.
- Chemical sensitivity: Attacked by strong acids and some solvents
Fabrication and machining considerations for nylon
Machining behavior
Nylon can be machined using CNC milling and CNC turning, but its flexibility and moisture sensitivity require careful process control.
- Material can deform under clamping pressure
- Sharp tooling improves finish and dimensional accuracy
- Moisture content can affect machining consistency
Moisture and dimensional control
- Parts may absorb moisture after machining and change size
- Critical tolerances may require conditioning or compensation
- Design must account for environmental exposure
Wear and motion applications
- Commonly used for bushings, rollers, and sliding components
- Performs well in dynamic loading environments
- May require lubrication depending on load and speed
Common applications for nylon
Nylon is widely used in industrial applications requiring strength, durability, and wear resistance.
- Bushings and bearings
- Structural plastic parts
- Automotive components
- Industrial wear parts
- Electrical and mechanical housings
- Custom machined components
When nylon is a strong material choice
Nylon is often the right choice when mechanical strength, impact resistance, and wear performance are required, and some dimensional variation can be managed.
- When parts experience dynamic loading or impact
- When wear resistance is required in moving components
- When the part needs high strength and toughness
- When moisture effects can be accounted for in design