Nano Silk 50 Denier 12/0 – Semperfli
Possibly the world’s strongest fly tying silk. Virtually unbreakable and still capable of being split down for dubbing twists.
With a breaking strain of 7.9lbs, Nano Silk offers unmatched strength compared to any other fly tying thread available.
Available in a 50m spool, ideal for precision fly tying applications.
| Specification | Value |
|---|---|
| Denier | 50 |
| Breaking Strain | 7.9lbs |
| Length | 50m |
| Recommended Use | Ceramic bobbins |
FAQ
Can Nano Silk be split for use in dubbing?
Yes, Nano Silk can be split down for dubbing twists while maintaining its strength.
What type of bobbin is recommended for use with Nano Silk?
Ceramic bobbins are recommended for optimal performance with Nano Silk.
Is Nano Silk suitable for heavy-duty fly tying applications?
Yes, due to its 7.9lb breaking strain, Nano Silk is ideal for heavy-duty fly tying where strength is critical.




Nicola Vaughan –
Used Nano Silk for a series of streamer flies and found it incredibly strong. It held up well during casting and in the water. The thread didn’t fray or break even under heavy tension. Perfect for durable fly construction.
Evan Poole –
Split the thread for dubbing and it worked smoothly. No breakage during tying or use. The 50m length is sufficient for multiple projects. Highly recommend for serious fly tyers.
Jacob Morrison –
Stronger than other silks I’ve tried. A bit harder to handle when splitting, but once adjusted, it performs reliably. Good for long-term fly building.