Transom Knot
binding knot
Joining two poles at a right angle doesn't always need the full multi-stage process of a proper square lashing - sometimes a quick, light binding is all a temporary frame, camp furniture joint, or field repair actually calls for. The transom knot fills that gap, and it does so with a single binding knot rather than a miniature lashing. It is a strangle knot tied diagonally across the crossing point of the two spars: the cord goes over the joint on one diagonal, around behind both poles, back up on the other diagonal, and the working end tucks under both turns where they cross. Pull both ends hard and the turns bite down. There are no wrapping turns, no frapping turns and no finishing clove hitch.
Ashley recorded it as ABOK #1255, and made it to hold together the two cross sticks of his daughter's kite - which is a fair guide to the scale of joint it suits. The documented way to stiffen it is not more turns but a second transom knot, tied on the other side of the crossing and at right angles to the first.
It is sometimes introduced alongside the square lashing, but it is not a simplified version of one and the motions have nothing in common - a square lashing is a sequence of wrapping and frapping turns, while this is one knot pulled tight. Treat them as two separate techniques for two different scales of joint.
For anything that actually needs to bear real weight - a shelter's structural frame, a raft, a tripod for hoisting - the additional wraps and properly tensioned frapping turns of a full square or shear lashing are worth the extra time; the transom knot is best reserved for lighter, more temporary right-angle joints where speed matters more than maximum rigidity.
We previously listed a second name for this knot, the square lashing knot, which we could not find in any reputable source and have removed. Published sources describe the transom knot as useful in place of a light-duty square lashing, which is not the same as its being called one - and the difference matters, because someone who believes the two are one technique may under-build a joint that genuinely needs a full lashing.
A quick way to judge which technique a given project needs: if the joint would be genuinely dangerous or costly to have fail (a raft that will carry a person, a tripod hoisting a real load), build the full square lashing with proper frapping; if the joint is simply holding something together for convenience (a camp table leg, a temporary garden trellis), the faster transom knot is entirely adequate and saves real time across a project with many such joints.
How to tie the Transom Knot
- 1Lay the two poles across each other at right angles.
- 2Pass the cord diagonally over the crossing point, take it around behind both poles, and bring it back up on the other diagonal so the two turns cross over the joint.
- 3Tuck the working end under both turns where they cross, so it comes back out beside the standing part.
- 4Pull both ends hard in opposite directions - the turns bite down diagonally across the joint and lock.
- 5For a stiffer joint, tie a second transom knot on the other side of the crossing, at right angles to the first.
Strength & security
A simple, fast binding for joining two poles at a right angle where the load is light and temporary - genuinely useful for camp furniture, small frames, or a quick repair, though it doesn't match a full square lashing's rigidity for anything load-bearing.
Cautions: It's a lighter-duty binding than a properly tensioned square lashing with full frapping turns - for a structural joint meant to bear real weight (a shelter frame, a raft, a tripod), the more involved square or shear lashing is the better choice.
Alternatives
- Square Lashing
The more robust, fully developed version of the same right-angle joining idea, with more wraps and frapping turns for genuine structural load-bearing use.
FAQ
Is the transom knot as strong as a square lashing?
No - it's a simpler, faster version meant for light-duty or temporary right-angle joints. A full square lashing with proper frapping turns is meaningfully more rigid for structural use.
When should I use the transom knot instead of a square lashing?
For quick camp furniture, small frames, or temporary repairs where speed matters more than maximum joint rigidity - use a full square lashing for anything load-bearing.
Is the transom knot a good knot to learn before the square lashing?
Not really - no movement is common to both. Learning one teaches you nothing about the other. Knowing which the job calls for is the useful part.
Is the transom knot really the same as the square lashing, given its alternate name?
No, and we have dropped that alternate name for want of a reputable source. This is one binding knot across a joint. A square lashing is many turns and a great deal more work.
Can the transom knot be tightened further after it's tied?
Only by untying and redoing the frapping turns - unlike an adjustable hitch, once the wraps are cinched and the finishing clove hitch is set, the joint's tension is essentially fixed rather than something that can be tweaked in place.
Gear that pairs with this knot
- Jute garden twine
Ashley tied this for the cross-sticks of a kite; light cord that grips itself is the right scale — a garden trellis or a bean frame is the same job.
- Bamboo garden stakes
The poles a transom knot most often joins at right angles today, at exactly the light-duty scale the page says it suits.
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