Nano Silk

Nano Silk is an amazing tying thread, extremely strong and fine it gives confidence to fly tyers and avoids build up. Nano silk MUST be used with ceramic bobbin holders. Although strong its fine fibres are almost weightless. 1kg of Nano Silk 50D will stretch over 50 miles or 85km. Loved by fly tyers, it is also used in the medical sector, for kites, archery, in tv and even in trials for NASA

Nano Silk strength means it can cut through fine or hollow fibres or materials like foam, however if used flat or untwisted and lay 2 lose wraps before tightening down it is easy to avoid cutting materials. Finally make sure to use old scissors a craft blade or a sliding action with your scissors as cutting is a sure way to blunten your scissor blades because of its astounding strength

Nano Silk comes with permanent dope dyed black or dyed colours ideal for the fly tyer. Use coloured Nano silk for bodies, ribs and heads or use white Nano Silk and colour with a permanent marker pen as required.
We are creating Youtube playlists from the many videos on our materials from around the world. Check our Youtube channel here or our Nano Silk dedicated playlist

Nano Silk is stronger than any comparable GSP, you don't believe us check the table at and compare.

How? well its simple GSP is extruded like spaghetti and like when you make spaghetti if you use the best ingredients you get the best product. At Semperfli we use the highest quality materials to produce the strongest, slickest and best fly tyng GSP in the market. The result is an 18/0 or 30 denier thread that will not build up but has a breaking strain of 1,140gm or 2.51lb, strongest in test of 30 denier threads through to 100D 3/0 thread with a breaking strain of 3,800gm or 8.4lb perfect for spinning deer hair or making large predator flies.

We have dealers and distributors world-wide and are always looking for quality dealers that are looking to partner Semperfli. We pride ourselves on being on of the most innovative and high quality fly tying materials manufacture in the world. We are constantly improving and developing our products, packaging and marketing collateral.

We provide active support to our partners from head office, we have B2B online ordering systems, trade images catalogs and support through our Pro Team comprising of some of the best fly tyers in the world. Find out more here

About Nano Silk

Nano Silk is regarded as the tying thread of choice of professional fly tyers worldwide. Being so super strong and available in such a variety of colors and deniers it has endless possibilities and can be used for micro flies to medium flies. Virtually unbreakable and still capable of being split down for dubbing twists there is no fly tying thread as strong as Nano Silk anywhere. Available in 30D (19/0), 50D (12/0), 100D (6/0) and 200D (3/0)

Check Nano Silk Hints Here


Nano Silk 30D Specifications

Because Nano Silk lays perfectly flat you get no thread build up. Indeed check out our video where we put 100 wraps on a thread and you still have no head buildup!

With Nano Silk you will have confidence that even the smallest of flies can be tied without your thread breaking! Strength 10 times stronger than high quality stainless steel of same diameter

Nano Silk Size

30D 18/0

50D 12/0

100D 6/0

200D 3/0

Ideal Hook Size

16 to 32

8 to 16

Salmon & predator flies
Deer Hair Spinning

Predator & saltwater flies

Approx Breaking Strain (gm)


Approx Breaking Strain (lb)


Meters per spool


Meters per BULK spool


(same as 10 standard spools)


Nano Silk 30D 18/0 Range

Nano Silk 50D 12/0 Range

Nano Silk 100D 6/0 Range