UNI-Thread 6/0 Fly Tying Thread

By UNI
Regular price $4.50
The all-around polyester tying thread. Four diameters cover everything from midges to deer-hair bugs.
Color
In stock. Ships immediately or available for in-store pickup.
Free shipping $100+ Expert help: 1-800-659-1707 Since 1955
%3Cp%3EEarn%20[points_amount]%20Pursuit%20Pass%E2%84%A2%20points.%20%3C/p%3E

About this item

Description

UNI-Thread 6/0 is a 136-denier continuous-filament polyester thread built for everyday fly tying. It provides more strength than 8/0 without the bulk of heavier threads, making it a versatile choice for dry flies, nymphs, wet flies, and small to medium streamers.

Its thin waxed finish improves material control while helping the thread lay flat and build clean, compact bodies and heads.

Performance

  • Denier: 136

  • Nominal breaking strength: 33 ounces

  • Spool length: 200 yards

  • Construction: Continuous-filament polyester

  • Finish: Waxed

When to choose 6/0

Choose 6/0 when you need an all-around tying thread with more strength than 8/0 but without excessive bulk. It is the UNI size for everyday trout flies, beadhead nymphs, larger dry flies, wet flies, and small to medium streamers where strength and controlled thread buildup both matter.

Size Guide

Which UNI-Thread Size Should I Use?

  • 8/0 UNI-Thread: 72 denier with a nominal breaking strength of 16 ounces on a 200-yard spool. Use it for midges, small dry flies, emergers, and slim nymphs where thread bulk can change the finished profile. Its slightly bonded continuous filaments lay flat on the hook for clean, controlled bodies and heads.
  • 6/0 UNI-Thread: 136 denier with a nominal breaking strength of 33 ounces on a 200-yard spool. This is the most versatile UNI fly tying thread for dry flies, nymphs, wet flies, and small to medium streamers. Choose 6/0 when you need dependable strength without excessive buildup on everyday trout patterns.
  • 3/0 UNI-Thread: 220 denier with a nominal breaking strength of 32 ounces on a 100-yard spool. UNI recommends 3/0 for hooks larger than size 12. Its thicker diameter is well suited to larger streamers, bass flies, hair-wing patterns, bucktail, fur, and other materials that benefit from a broader thread wrap.
  • UNI BigFly Thread: 400 denier with a nominal breaking strength of 100 ounces on an 80-yard spool. BigFly is built for deer-hair bugs, large bass flies, pike and musky patterns, and heavy saltwater flies. Its larger diameter helps reduce the tendency to cut through hollow deer hair under tension, while its continuous filaments untwist easily for flatter thread bases.
Specifications

Understanding UNI-Thread Sizing

A larger thread diameter does not automatically produce greater breaking strength. UNI’s current specifications list 3/0 at 32 ounces and 6/0 at 33 ounces. Choose 3/0 when you need a thicker thread footprint and more material coverage on larger flies. Move to 400-denier BigFly when the job requires a substantial increase in holding power.

Key Features

  • Continuous-filament polyester construction
  • Available in 8/0, 6/0, 3/0, and 400-denier BigFly
  • Waxed 8/0, 6/0, and 3/0 options
  • Sizes for small trout flies through large predator and saltwater patterns
  • 200-yard spools in 8/0 and 6/0
  • Multiple tying colors, with availability varying by size
  • BigFly untwists for flatter wraps
  • BigFly’s wider diameter works especially well for spinning and securing deer hair

Choose 8/0 when profile and low bulk matter most, 6/0 for all-around trout tying, 3/0 for larger-diameter wraps on bigger patterns, and BigFly when maximum holding power is the priority.

Shipping & Returns

Shipping

 

  • All other domestic states, territories, and provinces Billed Actual Cost
  • International: Billed Actual Cost. Feather Craft Fly Fishing is not responsible for any customs fees or duties upon delivery.

Returns

To start a return: 

Send your returns via the carrier of your choice to the following address. To be eligible for a return, your item must be in the same condition that you received it, unworn or unused, with tags and warranty cards, and in its original packaging. Items must be returned in their original packaging, including the manufacturer's box when applicable, and that box should be placed inside a separate outer shipping box with labels affixed only to the outer package. We highly recommend tracking and insurance and are not responsible for lost or stolen shipments:

Feather Craft Fly Fishing Attn: Returns 8307 Manchester Road St. Louis, MO 63144

We have a 30-day return policy, which means you have 30 days after receiving your item to return it. 

All returns are subject to a 15% restocking fee, which will be deducted from your refund. Custom orders can be returned if defective for an exchange only. Used items cannot be refunded. No refunds on rigged backing.

Damages and issues

Please inspect your order upon reception and contact us immediately if the item is defective, damaged or if you receive the wrong item so that we can evaluate the issue and make it right.

Exceptions / non-returnable items

Certain types of items cannot be returned, like perishable goods, custom products, special orders or personalized items. Please get in touch if you have questions or concerns about your specific item. 

Unfortunately, we cannot accept returns on sale items or gift cards.

Exchanges

The fastest way to ensure you get what you want is to return the item you have and make a separate purchase for the new item.

European Union 14-day Cooling Off Period

Notwithstanding the above, if the merchandise is being shipped into the European Union, you have the right to cancel or return your order within 14 days, for any reason and without a justification. Orders returned under this cooling-off period are refunded in full and are not subject to the 15% restocking fee. As above, your item must be in the same condition that you received it, unworn or unused, with tags, and in its original packaging. You'll also need the receipt or proof of purchase.

Refunds

We will notify you once we've received and inspected your return. Once approved, you'll be refunded to your original payment method, less the 15% restocking fee where applicable, within 10 business days. Please remember it can take some time for your bank or credit card company to process and post the refund too. 

If more than 15 business days have passed since your return, please contact us at info@feather-craft.com.

Other UNI-Thread sizes

Same thread construction, different diameter. Compare sizes for the flies you tie.