Fly Tying Thread Table

Brian,

UTC threads are from Wapsi, and they are there. I haven't had them all in hand, but all the information I have been able to gather is in the table.

Martin

Lee,

unfortunately I have no idea. Most of those who deliver tying thread are for some reason very keen on keeping these facts to themselves. The few manufacturers who make thread are equally silent - probably under contract.

So no, I don't know...

Martin

SoCalAngler,

No, you aren't missing anything, but just found an example of the inconsistency of tying thread sizing... the whole motivation for me doing this article and table in the first place. The threads are clearly not the same - different physical thicknesses - and still you will see them listed as the same Denier.

In my eyes the only proper way to categorize thread would be physical thickness, breaking strength, material (nylon, poly, GSP) and fiber layout (spun, braided, parallel, fused etc.). That would avoid such confusing cases.

Trust the physical thickness in the table. I have personally measured almost all threads. And trust your experience when it comes to breaking strength (it's difficult to measure consistently). The Veevus threads are generally pretty strong.

Martin

Darrel,

All the threads that have actual measures in millimetres have been measured by me. That gives me a pretty good confidence in the results, but of course with all the factors mentioned in this section regarding measuring the thickness of tying thread. It can - rightfully - be debated if these measures are the actual diameters of the threads, but the fact is that they are what I found using a consistent method and measuring all threads in several places - and from several spools if possible.

The whole point of this table and the article is to point out that almost any label on any thread has no direct connection with the actual thickness of the threads. Deniers, aughts and other designations simply don't compare to the physical thickness - oftentimes not even within the same brand. So it was no surprise to me finding two UTC threads, one "heavier" than the other, and the heavier one measuring as thinner than the light one.

Martin

Peter,

Your findings match my own experiences with almost any spooled material: tinsel, wire, monofilament ... you name it. We can't use terms like small, medium, large, wide, narrow, thin, thick for anything! We need absolute measurements in fractions of an inch or millimeter (preferably both), so that there can be no doubt and things can be compared.

And don't get me started on hooks where the problem is the same. I have worked on an article on hook sizes, which is just as confusing with numbered sizes that vary wildly from company to company and are totally crazy even from the same manufacturer.

It's 2024 and you'd think that the industry would be as interested as us consumers in updating these measures and units, of which most were invented up towards two centuries ago.

But that doesn't seem to be the case. We're stuck with 1/0, 5 weight, medium and all kinds of odd and almost useless units.

My thread table is a feeble try to get a little order into that part of our world. I'm glad it's helpful.

Martin