Key takeaways
- The figure-eight on a bight creates a fixed loop by tying a figure-eight in a doubled section (bight) of rope.
- It's used to clip into anchors and create attachment points.
- It's strong, secure, and easy to inspect — sharing the figure-eight's trusted qualities.
- It's one of the most-used loop knots in climbing, quick to tie without the rope ends.
This is general educational information, not instruction. Knots are life-critical — learn and verify them hands-on with qualified instruction.
What it is
The figure-eight on a bight is a knot that creates a secure, fixed loop in a rope by tying a figure-eight in a doubled section of the rope (a ‘bight’) — rather than threading the rope’s end through, as in the follow-through tie-in version. The result is a strong loop you can clip a carabiner into.
What it’s used for
It’s mainly used to create a clip-in loop for attaching to anchors — clipping yourself into a belay anchor with a locking carabiner, or creating a master point. Because you tie it in a bight without needing the rope’s end, it’s quick and convenient at a stance.
Arriving at a belay, a climber ties a figure-eight on a bight in their rope and clips it to the anchor’s master point with a locking carabiner — a strong, easily checked loop securing them to the anchor while they belay their partner up.
Why climbers trust it
It shares the figure-eight family’s strengths — strong, secure, and easy to visually inspect (a correct figure-eight has an unmistakable symmetrical shape). That inspectability and security make it one of climbing’s most-used loop knots, used for anchoring alongside the adjustable clove hitch. It’s a core member of the essential climbing knots.
The bottom line
The figure-eight on a bight ties a strong, secure loop in a rope using a doubled section — the go-to loop for clipping into anchors and making attachment points. It inherits the figure-eight's best traits: strength, security, and easy visual inspection. Quick to tie without the rope ends, it's one of climbing's most-used and trusted loop knots, alongside the adjustable clove hitch.
Frequently asked questions
What is a figure-eight on a bight?
The figure-eight on a bight is a knot that creates a secure, fixed loop in a rope by tying a figure-eight in a doubled section of the rope (a bight) — rather than threading the rope's end through, as in the follow-through version. The result is a strong loop you can clip a carabiner into, commonly used for anchoring.
What is the figure-eight on a bight used for?
It's mainly used to create a clip-in loop for attaching to anchors — for example, clipping yourself into a belay anchor with a locking carabiner, or creating a master point. Because you tie it in a bight (a doubled part of the rope) without needing the rope's end, it's quick and convenient to tie mid-rope or at a stance.
Why do climbers trust the figure-eight on a bight?
Because it shares the strengths of the figure-eight family: it's strong, secure, and — crucially — easy to visually inspect for correctness, since a correct figure-eight has an unmistakable symmetrical shape. This inspectability, combined with its security, is why it's one of the most widely used and trusted loop knots in climbing, used alongside the clove hitch for anchoring.
Sources
- Climbing knots — American Alpine Club
- Knots & anchors — The Mountaineers