Best Fly Tying Thread of 2026

A black 70-denier spool is the plainest thing in a fly tyer's drawer, and that is the point. UTC Ultra Thread is engineered for tying, and the 70-denier weight sits in the useful middle: fine enough for small nymphs and dries, substantial enough for buggers and small streamers. We reach for it when we don't want to think about thread.

What we appreciate is the consistency. The spool carries 100 yards, and the listed breaking strength is 2 pounds, which gives you some margin when you are cinching down materials. The thread builds a tidy body without the flat-lay drama of GSP, and the black disappears under peacock herl and dark dubbing. The line comes in 33 colors, though this spool is black; build out your palette as patterns demand. The 70-denier size is also forgiving under a bobbin and doesn't punish a slightly heavy hand the way an 8/0 can.

We keep it as the baseline spool for everyday trout flies. It is not the finest thread here for size 20 dries, and it is not the strongest for saltwater, but it handles the broad middle better than a specialized spool. If you want one black thread to learn on, this is the one we point to.

The 8/0 on the label is the whole story: this is a fine thread for small flies. We noticed the difference most on size 16 to 22 dries and nymphs, where a heavier thread can crowd the hook and make a tidy body harder. The black is deep and consistent, and it sinks into dark dubbing rather than sitting on top of it.

The 200-yard spool is generous for a thread this fine. We liked not having to ration it on a long run of small patterns, and the spool is a manageable size on the bench. The thread has a clean, synthetic feel and takes tension without much stretch. It is not the thread we reach for on heavy streamers; that is a job for a stronger 100-denier GSP or a thicker 140-denier spool.

For small trout flies, the fine diameter and big spool are the combination that matters. It is a standard black 8/0, not a specialty thread, and that is exactly why it earns a place: it covers the patterns where bulk is the enemy. We keep it next to the 70-denier spool and switch when the hook gets below a size 16.

The first thing you see is the yardage: 270 yards per spool, six spools in the set. That is a lot of thread for the money, and the 6/0 100D size is right for small and medium trout flies. We like it as a volume spool for everyday patterns, especially when you are tying a run of the same nymph and don't want to watch the spool drop.

The six colors are useful rather than decorative: rose pink, red, gold, light green, white, and green cover a lot of bodies and hot spots. The thread is continuous-filament and high-tenacity, and it lays a smooth body without a lot of fuzz. The thin diameter is less forgiving under hard tension; some spools break before you expect, so test a length before you commit a full pattern.

We keep the set for small nymphs, soft hackles, and general trout patterns. The six colors and long spools are the reason it earns a place: you can tie a season of the same pattern without reordering, and the price per spool stays low. The color range is not huge, but it covers the basics, and that is what a volume set should do.

A six-spool kit is the fastest way to stop hunting for a color mid-pattern. XFISHMAN's 6/0 set gives you 150 yards of each in six common colors, and the 6/0 size covers hook sizes 4 to 20, so it can handle trout flies, buggers, and small streamers without six separate purchases.

What we appreciate is the starter-kit logic: the colors are the ones you actually use, and the spools are big enough to learn on without feeling precious. The thread is polyester and winds smoothly. The 150-yard spools leave room to practice knots and whip finishes without watching the thread disappear. The spools are labeled clearly, which sounds minor until you are reaching for olive in the middle of a pattern.

For a beginner who wants options, the kit does its job. If you tie mostly size 20 dries, an 8/0 is a better fit. The six colors cover most of what a new tyer needs, and the box keeps them together. The kit is a starter palette, not a lifetime supply, and that is the right way to read it.

HERCULES sells this as a 12-roll color kit, and the appeal is breadth: 12 colors, 100 yards each, in a 140-denier nylon. That is thicker thread than the 70D and 8/0 spools here, so it suits bigger nymphs, streamers, and bodies that need to build quickly.

The 140D size is the thing to understand before you buy. It covers hook sizes 6 to 14, and it wraps a bulky body with fewer turns, which is useful for stoneflies, buggers, and hair. On a size 18 dry, it is more thread than you want, and it will crowd the hook.

The practical detail we like is the standard spool: it fits most bobbins, so you are not fighting an odd-shaped roll. The nylon is soft and flexible, and the 12 colors give you room to experiment without buying a full set of premium spools.

This is the kit we reach for when we need a color we don't keep on the bench, not the spool we choose for fine dries. If your tying leans toward bigger nymphs and streamers, the 140D makes sense; if you tie small trout flies, stay with the 70D or 8/0.

Waxed thread is a small thing that changes how materials behave. Bolsek's 75D 8/0 spool is lightly twisted and highly waxed, so it grips slippery feathers and synthetic materials instead of letting them slide. The wax is the reason to consider it for midges, small nymphs, and dry flies where a little extra hold matters more than a perfectly flat wrap.

The 8/0 size is fine, and 320 yards per spool is a huge amount for small flies. Eight colors give you more range than a single spool, and the standard spool fits most bobbins. The waxed finish is not for every pattern; on fine dries you may prefer a smoother unwaxed thread.

Check the spool before you load it; a warped one can bind in a standard bobbin. For small waxed flies, the grip and the eight-color range are the reason it earns a place. It is a specialized spool, not the one we keep on the bench for every pattern.