| Joins | Flat webbing into a loop |
| Structure | Retraced overhand |
| Tails | Leave long (≈8 cm) |
| Difficulty | Intermediate |
The water knot, or ring bend, is the standard knot for joining the ends of flat webbing into a sling or runner. It’s a retraced overhand knot that holds well in webbing, where many other knots slip. The tails must be left long and the knot checked regularly, since water knots can slowly creep loose over time.
What it’s for
Tying lengths of flat webbing into slings and tied anchors — webbing is too slippery for most rope knots.
Tie it right
Retrace an overhand so both strands run parallel, and leave long tails (about 8 cm).
Check it often
Water knots can creep loose; inspect before every use, or use sewn slings for critical jobs. See all climbing knots.
Frequently asked questions
What is a water knot used for?
It joins two ends of flat webbing (tape) into a loop, used to make slings, runners, and tied anchors from webbing. It's chosen because flat webbing is slippery and the water knot grips it far better than most rope knots would.
How long should the tails be on a water knot?
Leave generous tails of at least about 8 cm (three inches). Long tails are important because water knots can slowly work loose with handling and load cycling, and long tails give a safety margin and a visible cue to inspect.
Do water knots come undone?
They can creep loose over time, especially with repeated loading and unloading, which is why tied webbing slings should be checked before every use and the tails kept long. For this reason many climbers prefer sewn slings for critical applications.
Sources
- Webbing and slings — American Alpine Club