Nylon 66 is a strong, tough engineering plastic with a higher melting point and better stiffness and heat resistance than nylon 6. It is widely moulded, often with 30% glass fibre, for gears, bushes, cable ties, clips, fan blades and automotive under-bonnet parts. Like other nylons it absorbs moisture, which softens it and changes its size slightly.
Quick facts
- Type
- Semi-crystalline polyamide
- Melting point
- About 255–265 °C
- Tensile strength
- About 80 MPa dry (much higher with glass)
- Moisture absorption
- About 2.5–3% at normal humidity
- Common grades
- Unfilled, 30% glass filled, flame retardant
- Processes
- Injection moulding, machining from rod
Nylon 66 or nylon 6?
| Nylon 66 | Nylon 6 | |
|---|---|---|
| Melting point | Higher | Lower (about 220 °C) |
| Stiffness and heat resistance | Better | Good |
| Impact and surface finish | Good | Slightly better |
| Moulding | Narrower window | Easier |
Values are typical for unfilled grades. Grades from different makers differ; ask for the supplier's data sheet when it matters.
Typical uses
- Gears and bushes
- Cable ties and clips
- Automotive radiator and engine-bay parts (glass filled)
- Electrical connectors and housings
- Fan blades and impellers
Need parts made in Nylon 66?
Post your requirement free. Workshops that take your kind of work see it and get in touch. You only talk to the ones that fit.
Get startedRelated
Related job work
Questions
- Why are nylon parts dried before moulding?
- Wet nylon pellets cause bubbles and brittle parts, so they are dried to a low moisture level first.
- Does glass fibre make nylon stronger?
- Yes, 30% glass roughly doubles strength and stiffness and reduces creep, but makes parts less flexible.
- Nylon 66 or POM for gears?
- POM holds size better and runs with lower friction; nylon 66 is tougher and handles more heat and impact.
The figures on this page are typical values for guidance, written by Diemeco from standard engineering practice. They are not a specification: confirm grades and properties with the relevant standard or the supplier's mill test certificate, and tolerances with your workshop. Last checked 23 October 2026.