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KA

← Where the theory applies
Bend — two lines

J Knot

Wrap stack · Constriction

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

J Knot — finished-state checks, on the shared reference layout

J 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.

Albright family

Bight in the heavier leader; lighter line wraps the bight, then tucks.

  • !Bight in the lighter line — the wraps have nothing to bite
  • !Wraps walked off the bight instead of packed against the fold
  • !Tag never tucked back through the bight, so the wraps dump
Fails when
  • !Lines crossed inside the overhand, so one line takes more of the load
  • !Drawn up dry, which heats the line where it seats and weakens it
  • !Only the standing lines pulled, leaving one side of the knot loose
  • !Tied in braid, which Cast and Spear says may slip
Geometry

  • Incomplete passes through the join

    The usual J-Knot break at the tippet

    Every pass is load-bearing; one missed pass is a hinge · step 02

  • Tippet step too large for this family

    Fails at the join under the first hard take

    J-Knot is a modest step, not an extreme mismatch · step 01

  • Dry fluoro seat

    Glazed tippet at the join

    Seat wet; an incomplete pass plus heat is a double fail · step 03

If you saw this

  • Fails at the tippet join

    Check

    • ?Even seat
    • ?Diameter ratio

    Then

    • →Retie
    • →Reduce tippet step

  • Finished check failed — Lost wrap count

    Check

    • ?Ordered multi-wrap join with clean exits
    • ?Junction stays slim after seating
    • ?No reverse wraps

    Then

    • →Retie. A crossed J Knot becomes a cutting join under diameter step.

  • Incomplete passes through the join

    Check

    • ?The usual J-Knot break at the tippet
    • ?Inspect step 02

    Then

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

  • Tippet step too large for this family

    Check

    • ?Fails at the join under the first hard take
    • ?Inspect step 01

    Then

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

  • Dry fluoro seat

    Check

    • ?Glazed tippet at the join
    • ?Inspect step 03

    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

  • ·A bend captures two working ends. Holding is constriction and the seated wrap or barrel — not a closed-knot invariant.
  • ·Unequal diameters and slick pairs (braid to fluoro) are material problems. Crossing number does not rank FG against a Double Uni.

What topology does not predict

  • ·A Jones polynomial does not pick a braid-to-leader family.
  • ·Published retention bands stay as cited on the knot record. This page does not invent one.
  • ·Guide-click and tag-trim are field geometry, not topology.

Not for

  • ·Attaching a single line to a spar or cleat — that is a hitch
  • ·Reading this page as a recommendation from Decide
  • ·Braid primary joins
  • ·Extreme mismatch

Same pattern, different job

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

Sources