UTC Ultra Thread 70D is an ultra-fine, flat-laying fly tying thread designed for small flies where smooth coverage, low bulk, and clean proportions matter. Made from unbonded continuous-filament nylon, this 70 denier thread spreads into a thin ribbon on the hook shank, making it ideal for building sleek thread bodies, tapered abdomens, tiny dry fly heads, and delicate trout patterns.
With a breaking strength of approximately 1 pound, UTC Ultra Thread 70D gives fly tyers dependable strength in a very fine profile. It is especially useful for hook sizes #14 down to #22, including midges, small nymphs, emergers, micro patterns, and dry flies where excess thread buildup can quickly crowd the hook eye.
Why We Like It
UTC Ultra Thread 70D is one of the best choices when you need a thread that lays flat and keeps bulk to an absolute minimum. It creates smooth underbodies, clean heads, and slim fly profiles without sacrificing tying control. We especially like it for small trout flies, thread-bodied midges, and split-thread dubbing techniques where a flat, unbonded thread makes a noticeable difference.
Best Uses
UTC Ultra Thread 70D is ideal for tying:
Midges
Tiny nymphs
Small dry flies
Emergers
Micro patterns
Thread-bodied flies
Tapered abdomens
Small trout flies
Delicate fly heads
Split-thread dubbing bodies
Smooth underbodies
Hook sizes #14 to #22
Customer Reviews for UTC Ultra Thread 70 Denier
The Fly Fishers Fly Shop
It is rare that I leave a review, especially one of a business as I expect good service to be the norm, so when I’m presented with a business that goes beyond “good” service I feel compelled to share my experience. As most of you are familiar with the shortages brought on by the pandemic, you’ll understand the effort it takes to hunt certain tying supplies. This is how I first stumble upon The Fly Fishers - they stocked what I needed.
So, I ordered a large quantity of UTC 70 denier threads and some calf hair for tying streamers. Unfortunately when the package arrived it was without content, that is to say the parcel was open, retaining only their latest catalog. I contacted the shop in remote hope that there had been a mixup on their side, or if the contents had been removed, that they would split the replacement costs.
My call was answered by a friendly staff member (I apologize, I can’t recall his name), who was both understanding and engaged. He almost immediately called me back after speaking with his boss. Without any further questions, I was told that they’d absorb the full cost and would ship again once the items were in stock. This was done even though we had no prior history. Today I received the replacement package.
Thank you Fly Fishers Fly Shop. You’ve earned my future business.
James (from Tennessee)
- James
Fly Fishers Response: Thanks James. We sure appreciate your comments and your business. Thank you!
