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KA

← Where the theory applies
Terminal — hardware eye

Jack’s Knot

Constriction · Wrap stack

DiagramsHow to tie it

Does not pick a knot

This page does not pick a knot for you. DNA, molecules, quantum braids and vortices stay off Decide.

Finished structure

No drawing of this exact knot yet. The written steps are the reference.

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

What holds it

  • ·The eye is hardware. The knot is an open tangle around that eye. Ends stay ends.
  • ·Seating (wet set, even wraps, tag orientation) is the mechanical record already on the knot. Theory adds no extra rating.

What topology does not predict

  • ·Trefoil / unknot classification does not apply to a Palomar or clinch.
  • ·Fluoro glaze, pigtail slip and nick-at-the-guides are forensic, not topological.
  • ·No strength percentage is computed here.

Not for

  • ·A free-swing lure loop — use a non-slip loop family
  • ·Using an invariant as a reason to keep a glazed terminal
  • ·Braid
  • ·Heavy conventional tackle

Same pattern, different job

No sourced twin among these knots. Related knots stay on the Library card.

Sources