Short answer
Cast nylon (PA6G) typically has a density of 1.15 g/cm³, tensile strength of 75 – 85 MPa, hardness of 81 – 84 Shore D and a continuous service temperature of −40 / +100 °C. Its melting point is 215 – 220 °C and its coefficient of thermal expansion is about 80 × 10⁻⁶ 1/K. Thermal expansion and moisture absorption matter most in design.
Mechanical values
- Density 1.15 g/cm³: about 7 times lighter than steel for the same volume.
- Tensile strength 75 – 85 MPa: enough for sliding and rotating parts.
- Elongation at break 20 – 40 %: not brittle, it gives under impact.
- Modulus of elasticity 3,300 – 3,600 MPa: flexible compared with metal; consider it in bearing design.
- Hardness 81 – 84 Shore D.
These are typical laboratory values for cast polyamide 6. The full table is in technical data.
Thermal values and design
The thermal expansion of cast nylon is about 6 – 7 times that of steel. A 1 m part grows by roughly 4 mm when heated by 50 °C, so long slides and bushings running warm need clearance.
We explain clearance calculations with examples in tolerances for plastic parts.
Friction and moisture
The friction coefficient against steel is 0.35 – 0.42, lower for oil-filled grades. At saturation it can absorb 5.5 – 7 % moisture, which causes a small growth in size. Details are in water absorption of cast nylon.
If you need values for your specific application, contact us and we will support your design calculations.
Frequently asked questions
At what temperature does cast nylon melt?
The melting point is 215 – 220 °C. The continuous use limit, however, is +100 °C and the short-term limit about 160 °C.
Does cast nylon conduct electricity?
No, cast nylon is an electrical insulator. Applications that need antistatic properties require specially filled materials.
