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Diagram

Jack’s Knot

Jacks Knot · Jack Miller knot

Tying a hook or fly to tippet with a small knot of one loop and one wrap, drawn tight up the line and then slid down to the eye.

Terminal · Intermediate · Monofilament / Fluorocarbon · 4 steps

ApplicationsHow to tie it
Jack’s Knot, finishedJack’s Knot, finished

Finished structure

Drawn from a rope model of this knot: which strand passes over which comes from where the rope actually lies.

  1. Run the tippet up through the eye and lay the tag back along the standing lineThe tippet passes up through the hook eye and the tag lies back alongside the standing line, making a doubled line below the eye.
    1Tag, back alongside
    2Standing line, to the rod
    Move 1 of 1Run the tippet up through the eye and lay the tag back along the standing lineYou should now see: Two strands lying parallel away from the eye, with the tag running well past where the knot will go.

    Step 01

    Run the tippet up through the hook eye, then bring the tag back down alongside the standing line so the two lie parallel.

    You should now see

    The tag lying back along the standing line to form a double line below the eye, with plenty of tag left to loop and wrap.

    If it goes wrong

    Leaving a short tag. It runs out partway through the wrap and cannot reach back up through the loop.

    Fix: Pull more tippet through the eye before forming the loop.

    Why: The tag has to form a loop, wrap the double line and come back up through that loop, so it needs to reach well past the double.

  2. Loop the tag up above the doubled line, then take it behind the double to belowThe tag leaves the doubled line, rises in a single loop above it, and crosses behind the double so its end hangs below the line.
    1The loop, above the double
    2Tag passes behind the double
    Move 1 of 1Loop the tag up above the doubled line, then take it behind the double to belowYou should now see: One open loop of tag above the doubled line, the tag crossing behind the double and hanging below it.

    Step 02

    Form a loop with the tag above the doubled line, then take the tag behind the doubled line so it finishes below it.

    You should now see

    One open loop of tag lying across the doubled line, with the tag passing behind the double and hanging below it.

    If it goes wrong

    Taking the tag in front of the doubled line instead of behind it, or adding a second turn. The loop twists and does not lie flat across the double.

    Fix: Undo the loop and form it again with the tag above the double, passing behind it and ending below.

    Why: This single loop is what the tag comes back up through in step 3. Its crossing has to run behind the double for that last pass to lock it.

  3. Working toward the fly, pass the tag in front of the double, then behind itCloser to the hook than the loop, the tag goes up in front of the doubled line and back down behind it, one full wrap, ending below the line.
    1One wrap: in front, then behind
    2The loop from step 2
    Move 1 of 2Working toward the fly, pass the tag in front of the double, then behind it
    Bring the tag back and up through the loop you made in step 2From below the line the tag runs back under the doubled line and comes up through the open loop, passing over the loop's top and out.
    1Up through the loop
    2The wrap
    Move 2 of 2Bring the tag back and up through the loop you made in step 2You should now see: The tag wrapped once round the double below the loop, then coming up through that loop, which is still open.

    Step 03

    Working back toward the fly, pass the tag in front of the doubled line and then behind it, then bring it up through the loop you made in step 2.

    You should now see

    The tag wrapped once around the doubled line below the loop and coming up through that loop, with the loop still open.

    If it goes wrong

    Passing the tag behind first and then in front, or down through the loop instead of up. The tag runs the wrong way and the knot will not draw into a neat shape.

    Fix: Back the tag out of the loop and wrap it again, in front first and then behind, before bringing it up through the loop.

    Why: Passing in front, then behind, then up through the loop traps the tag under its own wrap. NetKnots splits this into two steps.

  4. Wet the lines and pull tag and standing line to draw the knot tight firstPulled tight while it is still up the line, the loop and the single wrap close down into a small knot around the doubled line, clear of the eye.
    1Tightened, still clear of the eye
    Move 1 of 3Wet the lines and pull tag and standing line to draw the knot tight first
    Slide the tightened knot down the line until it sits against the hook eyeThe closed knot slides down the doubled line and comes to rest against the hook eye, with the tag end still long.
    1Knot against the eye
    Move 2 of 3Slide the tightened knot down the line until it sits against the hook eye
    Trim the tag close to the knotThe finished Jack's knot: a small knot of one loop and one wrap sitting against the hook eye, the trimmed tag stub standing beside it.
    Move 3 of 3Trim the tag close to the knotYou should now see: A small, compact knot against the hook eye, centred on the line, with the tag cut short.

    Step 04

    Wet the lines and pull the knot tight first, then slide it down to the hook eye. Trim the tag close to the knot.

    You should now see

    A small, compact knot sitting against the hook eye, centred on the line, with the tag cut short.

    If it goes wrong

    Pushing the knot down to the eye while it is still loose, instead of tightening it first. It bunches against the eye and closes out of shape.

    Fix: If the knot has closed twisted or out of shape, cut it off and tie it again, tightening it fully before sliding it to the eye.

    Why: Drawing the knot tight up the line lets the wraps close evenly. Sliding the finished knot down then seats it against the eye without disturbing them.

HTH · Reference layout

Jack’s Knot — finished-state checks, on the shared reference layout

Jack’s Knot — finished-state checks, on the shared reference layout
Hook the Horizon reference plate
Failure modes

When this family fails, it fails as these. The recovered end still outranks the name.

Jam-hitch terminal family

A compact hitch or jam at the eye — fewer wraps, a different lock than a clinch barrel.

  • !Lock never jammed to the eye — it is a loose hitch in disguise
  • !Used on a small eye that cannot take the bulk of the jam
  • !Confused with a clinch: the tag path is not a barrel tuck
Fails when
  • !Loop crossing runs in front of the double line, so the last pass does not lock it
  • !Tag passed down through the loop instead of up, so the knot does not draw into shape
  • !Pushed to the eye while still loose, so it bunches and closes out of shape
Geometry

  • Reversed crossing

    Compact knot twists to one side and slips

    Jack’s is a specific crossing, not a random hitch · step 02

  • Will not seat — wrong side of the crossing

    Opens under load

    Seat only after the crossing is the Jack’s crossing · step 03

  • Tag exits the wrong side, or used on braid

    Not this knot — braid will not hold this hitch

    Tag exit side is the lock; braid is the wrong fibre · step 04

If you saw this

  • Compact crossing twists to one side or slips

    Check

    • ?Crossing centered on the standing tippet

    Then

    • →Retie slowly
    • →Step to Orvis or Davy if the crossing will not stay centered

  • Finished check failed — Stopped mid-sequence

    Check

    • ?Full sequence completed
    • ?Compact seat
    • ?Tag controlled

    Then

    • →Retie. An incomplete Jack's Knot is unreliable on the first fish.

  • Reversed crossing

    Check

    • ?Compact knot twists to one side and slips
    • ?Inspect step 02

    Then

    • →Retie. Do not dress a defective structure and call it seated.

  • Will not seat — wrong side of the crossing

    Check

    • ?Opens under load
    • ?Inspect step 03

    Then

    • →Retie. Do not dress a defective structure and call it seated.

  • Tag exits the wrong side, or used on braid

    Check

    • ?Not this knot — braid will not hold this hitch
    • ?Inspect step 04

    Then

    • →Retie. Do not dress a defective structure and call it seated.
Same family

Same failure class, different geometry. Open the plates — Diagnose still starts from the symptom.

This failed — start Diagnose

Why this knot

What it earns its place with, what it costs, and what to reach for instead.

Best for
Fly hooksQuick to tie
Not ideal for
  • Braid
  • Heavy conventional tackle
  • Anyone who inspects Davy/Orvis more reliably
Common mistakes
  • Tag too short to come back up through the loop
  • Tag taken in front of the double line when forming the loop
  • Wrap made behind first, or tag passed down through the loop instead of up
  • Knot pushed down to the eye before it is tightened
Alternatives
  • Davy KnotBeginner

    Tying a small fly to tippet with a quick, compact knot

  • Orvis KnotBeginner

    Ties tippet to a hook or fly with a small knot built on a figure eight

  • Pitzen KnotIntermediate

    Tying a hook, lure or fly to line or tippet

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