UNI-Thread in 3/0, 6/0, 8/0, and Big Fly
UNI-Thread is one of the most trusted names in fly tying, offering a complete system of thread sizes—8/0, 6/0, 3/0, and Big Fly—designed to give tiers precise control, strength, and versatility. Each size is made from tightly spun, lightly waxed polyester that grips materials securely, resists fraying, and maintains consistent color. The waxed finish helps the thread “bite” into hooks and materials, while its ability to be flattened or twisted provides excellent control over tension, strength, and bulk.
8/0 UNI-Thread
The finest diameter in the lineup, 8/0 is ideal for small dries, emergers, and midges where slim bodies and delicate proportions matter. It builds minimal bulk yet offers surprising strength, making it perfect for patterns like Griffith’s Gnats, RS2s, and Comparaduns.
6/0 UNI-Thread
The most versatile size, 6/0 excels across a broad range of dry flies, nymphs, and small streamers. It’s strong enough for hair, hackle, biots, and foam but fine enough to avoid excess buildup. Patterns such as the Adams, Elk Hair Caddis, and Pheasant Tail Nymph benefit from its balance of strength and finesse.
3/0 UNI-Thread
For larger trout streamers, bass bugs, and articulated flies, 3/0 delivers the torque needed to secure heavy materials like bucktail, rabbit strips, and synthetics. Its added thickness helps build durable heads and withstand aggressive tightening on patterns like Clousers, Woolly Buggers, and Muddlers.
UNI Big Fly Thread
The strongest option, Big Fly Thread is built for musky, pike, and saltwater patterns requiring maximum holding power. Its cord-like strength locks down thick synthetics and long fibers on large-gauge hooks while still laying smoothly.
Across all sizes, UNI threads maintain smooth handling, durability, and consistent color, giving tiers a reliable system for everything from tiny midges to massive predator flies.
