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Hitch — object-dependent

Anchor Bend

Friction on hardware · Physical hitch theory

Does not pick a knot

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

Anchor Bend, finishedAnchor Bend, finished

Finished structure

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

Failure modes

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

Jam-to-hardware family

A hitch that cinches to the ring or shackle and is not meant to break by hand.

  • !Second turn tied outside — two half hitches, not a jam
  • !Expected to untie after a snatch
  • !HMPE without a splice — the hitch strips the cover
Fails when
  • !The end is tucked under only one turn, and the knot eases open under a pulsing load
  • !Only one pass went through the ring, so the knot is plain half hitches with no turns clamping the end
  • !The half hitch is missing or loose, and the tucked end works back out of the turns as the rode swings
  • !The tail was left unseized on a rode that stays down, and over weeks of soaking and swinging the hitch loosens unseen
Geometry
  • Single pass, no round turn

    Hitch slips on the ring in a swell

    The round turn is the hitch · step 01

  • Working end missed a turn

    Tuck does not lock and the rode walks

    The working end must pass through both turns · step 02

  • Unseized standing job

    Soak and swell work the tail loose

    A rode that lives underwater gets seized or taped · step 04

If you saw this
  • Hitch works loose after a soak

    Check

    • ?Working end through both turns
    • ?Half hitch dressed

    Then

    • →Seize the tail
    • →Retie wet
  • Single pass, no round turn

    Check

    • ?Hitch slips on the ring in a swell
    • ?Inspect step 01

    Then

    • →Retie. Do not dress a defective structure and call it seated.
  • Working end missed a turn

    Check

    • ?Tuck does not lock and the rode walks
    • ?Inspect step 02

    Then

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

    Check

    • ?Soak and swell work the tail loose
    • ?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

  • ·A hitch is object-dependent. Remove the spar, cleat, ring or pile and the structure is usually the unknot.
  • ·Bayman / Maddocks–Keller describe a no-slip regime from wrap count and friction. The prediction is approximate, and only for hitches.

What topology does not predict

  • ·Closed-loop knot invariants (Jones, Alexander) do not say whether a clove hitch will walk on a smooth spar.
  • ·No manufacturer working load is implied by wrap count.
  • ·Wet, iced, or HMPE covers change friction — topology is silent.

Not for

  • ·Joining two free rope ends — that is a bend
  • ·A standing loop that must survive after the object is gone
  • ·A job you must undo every five minutes
  • ·Slick HMPE without a seizing

Same pattern, different job

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

Sources