How to Tie the Trilene Knot
Usage
The Trilene Knot ties monofilament or fluorocarbon line to a hook, lure, or swivel. It's the double-pass upgrade to the plain Improved Clinch Knot: instead of threading the eye once, you thread it twice before wrapping, which spreads the load across two strands where the line rubs against the hard metal edge.
Why Learn the Trilene Knot?
If you fish mono or fluoro and you're tired of clinch knots slipping or nicking through at the hook eye, this is the fix. It costs you one extra pass through the eye and a few extra seconds at the vise, and in exchange you get a connection that most anglers rate as strong or stronger than a standard clinch on the same line.
Common Uses
Fishing and Fly Fishing
- Attaching monofilament or fluorocarbon line to a hook, lure, or swivel — the knot's core, near-universal use.
- Fly-to-tippet connections on larger-eye hooks, where the extra strength is worth the extra step (see When Not to Use below for the small-fly exception).
Other Names
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Notable Features
- Double Eye-Pass: The line runs through the hook, lure, or swivel eye twice before wrapping — the structural feature that gives the knot its edge over a single-pass clinch.
- Line-Gauge-Scaled Wraps: Wrap count runs roughly 4 to 10 depending on line diameter and source — thicker line takes fewer wraps, thinner line takes more.
- Mono and Fluoro Home Turf: Every source treats it as a top recommendation specifically for monofilament and fluorocarbon, not as an all-line-types knot.
Similar Knots
Improved Clinch Knot vs. Trilene Knot
- Advantage: The Trilene's second eye-pass is reported to distribute strain better on hard hook eyes, and it edged out the Improved Clinch Knot in a head-to-head strength contest on both mono and fluoro.
- Disadvantage: That edge was small enough that a follow-up statistical check of the same test data found it wasn't a reliable difference — plus the Trilene's second pass makes it slower to tie and harder on tiny hook eyes.
Palomar Knot vs. Trilene Knot
- Advantage: The Trilene's doubled pass is the better fit specifically for mono/fluoro against a hard metal eye.
- Disadvantage: The Palomar Knot works across mono, fluoro, and braid, and most sources call it the stronger, simpler default — the Trilene has no answer for braided line at all.
Uni Knot vs. Trilene Knot
- Advantage: The Trilene needs no line-doubling and ties cleanly straight off the spool.
- Disadvantage: The Uni Knot handles braid as well as mono, which the Trilene structurally cannot do — reach for the Uni when the line on the reel might change.
Trilene Knot vs. Braid
Why a great mono knot can be a bad braid knot: braided line doesn't fail by cutting into the eye the way mono does, it fails by slipping against itself, since it's slick multi-strand line instead of a single extruded strand. Extra wraps don't fix a slip problem, they just delay it. Bear Essentials' rule for line-to-eye connections: match the knot to what actually breaks the line, not just to how many wraps it takes — a hard-eye problem needs more strands at the eye (Trilene), a slippery-line problem needs more bite on the line itself (Palomar or Uni). For braid, tie a Palomar or Uni Knot instead.
Security Level
Tied and lubricated correctly on mono or fluoro, the Trilene holds — every source agrees it resists slippage, and the dominant failure mode in testing is the line breaking above the knot, not the knot itself giving way. It's rated as secure-with-correct-dressing rather than bulletproof-no-matter-what, since no source has run the shake-loose or cyclic-load testing that would support a stronger claim.
Downsides
- Not for Braid: The single most consistent finding across every source — the Trilene underperforms on gel-spun/braided superline. Use the Palomar, Uni, or FG knot there instead.
- Tough on Small Eyes: Passing the line through a tiny dry-fly hook eye twice can be genuinely difficult and hard on the line, per Orvis News' practical fly-fishing guidance (Orvis News).
- No Untying: Like the rest of the clinch family, it's meant to be cut off and re-tied when you change hooks or lures, not untied.
Structure
The Trilene is a jam-hitch in the same family as the plain Clinch and the Improved Clinch Knot: wraps cinch down around the standing line under load, and the tag end locks inside the loop so it can't pull free. What sets it apart is the double pass through the eye before those wraps begin — two strands taking the strain at the hard eye edge instead of one.
History
The knot's structure shows up in print in 1975, in Tom McNally's Complete Book of Fishermen's Knots, as the "double-looped clinch knot" (Wikipedia). Pro anglers Jimmy Houston and Ricky Green later said they came up with it at Trilene promotional events in the late 1970s and wanted it named after themselves — Trilene applied its own brand name instead. Wikipedia's own sourcing hedges the Houston/Green account against McNally's earlier print appearance, so treat the promotional-event story as the branding origin, not necessarily the structural one.
How to Tie the Trilene Knot
Step 1
Pass the tag end of the line through the eye of the hook, lure, or swivel twice, leaving a loose loop behind the eye and 8–10 in (20–25 cm) of tag end free.
Step 2
Wrap the tag end around the standing line 5–6 times (thinner line can take more wraps, thicker line fewer — see Notable Features).
Step 3
Feed the tag end back through both loops formed in Step 1 — not back through the eye itself. Threading it back through the eye by mistake is the most common error anglers make with this knot.
Step 4
Lubricate with water or saliva, pull tight with steady, even pressure on the tag end and standing line, then trim leaving at least ⅛ in (3 mm).
Pro Tip: If you want to see the double eye-pass and the tuck-through-both-loops step from every angle before you try it on a hook that matters, the Knot IQ app lets you rotate the 3D model and count the wraps at your own pace — useful given how often anglers lose count partway through. The app pairs with our Knot IQ Companion Kit reference card if you'd rather practice the wrap count on paper first.
FAQ
Is the Trilene Knot really a "100% knot"?
In documented tests, the line usually does break before the knot does — around 95% of test breaks in one head-to-head contest happened at the hook eye, with the knot still intact. That's a strong tendency, not a guarantee, and it doesn't apply to braided line, where the knot itself is the weak point.
Can I use the Trilene Knot with braided fishing line?
Not recommended. Every dedicated source agrees the Trilene underperforms on modern gel-spun/braided superline — tie a Palomar, Uni, or FG knot instead.
Important Notes on Safety
Tighten the Trilene dry and friction heat from cinching can weaken monofilament or fluorocarbon right at the wraps — wet the knot with water or saliva before the final pull every time. And double-check the tuck step: feeding the tag end back through the hook eye instead of through the two loops produces a different, weaker finish that looks similar at a glance.
