Nylon 6 vs Nylon 66 for CNC Machining: Key Differences
Nylon 6 is more cost-effective with better impact resistance and easier processing. Nylon 66 offers higher heat resistance and stiffness, making it better for automotive under-hood and electrical applications.
Side-by-Side Property Comparison
| Property | Nylon 6 (PA6) | Nylon 66 (PA66) |
|---|---|---|
| Tensile Strength | 79 MPa (11.5 ksi) | 82 MPa (11.9 ksi) |
| Yield Strength | 70 MPa (10.2 ksi) | 69 MPa (10 ksi) |
| Hardness | Rockwell R119 | Rockwell R120 |
| Density | 1.14 g/cm³ | 1.14 g/cm³ |
| Machinability Rating | 70/100 | 68/100 |
| Thermal Conductivity | 0.25 W/m·K | 0.26 W/m·K |
| Melting Point | 220 °C | 262 °C |
| Tolerance | ±0.05 mm | ±0.05 mm |
Key Differences
| Property | Nylon 6 (PA6) | Nylon 66 (PA66) | Winner |
|---|---|---|---|
| Melting Point | 220°C | 262°C | Nylon |
| Stiffness | Good | Better | Nylon |
| Impact Resistance | Excellent | Good | Nylon |
| Cost | Lower | Higher | Nylon |
| Moisture Absorption | 9.5% (saturated) | 8.5% (saturated) | Nylon |
| Machinability | 70/100 | 68/100 | Nylon |
Which Material Should You Choose?
Choose Nylon 6 (PA6) when:
- General-purpose mechanical parts
- Impact-loaded components
- Budget-sensitive projects
- Cast nylon for large parts
- Wear pads and rollers
Choose Nylon 66 (PA66) when:
- Automotive under-hood components
- Electrical housings
- Higher temperature applications
- Parts needing better rigidity
- Glass-filled structural components
Not Sure Which Material to Choose?
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