Key takeaways
- A stopper knot is tied in a rope's end to stop it slipping through a device, anchor, or point.
- Its key safety use: preventing rappelling or being lowered off the end of the rope.
- Common forms include a double overhand or figure-eight knot in each rope end.
- Simple but vital — stopper knots have prevented many serious and fatal accidents.
This is general educational information, not instruction. Rope safety is life-critical — learn and verify these habits hands-on with qualified instruction.
What a stopper knot is
A stopper knot is a knot tied in the end of a rope to create a bulky stop that prevents the rope from slipping through a belay or rappel device, an anchor, or another point. Its most important use in climbing is preventing a climber from rappelling or being lowered off the end of the rope.
Why they matter
Rappelling or being lowered off the end of the rope — when the rope is too short to reach the ground or the next anchor — is a leading cause of serious and fatal climbing accidents. A stopper knot in each rope end physically blocks the rope from running through the device, stopping the climber before the end passes through. It’s a simple habit that prevents a catastrophic mistake.
Before rappelling an unfamiliar route where they’re not sure the rope reaches the next anchor, a climber ties a stopper knot in each end of the rope — so that if an end is too short, the knot jams against their device and stops them safely instead of letting them rappel off the end.
How to tie one
Common stopper knots are a double overhand (barrel) knot or a figure-eight tied in each rope end, bulky enough not to pass through the device. Many climbers make tying stopper knots in both ends a routine habit before rappelling or lowering, especially when unsure the rope reaches. They also back up rope-join knots like the flat overhand bend, and are part of the essential climbing knots.
The bottom line
A stopper knot is the simple, vital safety knot tied in a rope's end to stop it slipping through a device or anchor — above all, to prevent rappelling or being lowered off the end of the rope, a leading cause of fatal accidents. A double overhand or figure-eight in each end, tied as a routine habit, is cheap insurance against a catastrophic mistake.
Frequently asked questions
What is a stopper knot?
A stopper knot is a knot tied in the end of a rope to create a bulky stop that prevents the rope from slipping through a belay or rappel device, an anchor, or another point. Its most important use in climbing is preventing a climber from accidentally rappelling or being lowered off the end of the rope.
Why are stopper knots so important?
Because rappelling or being lowered off the end of the rope — when the rope is too short to reach the ground or next anchor — is a leading cause of serious and fatal climbing accidents. A stopper knot in each rope end physically blocks the rope from running through the device, stopping the climber before the end passes through. It's a simple habit that prevents a catastrophic mistake.
How do you tie a stopper knot?
Common stopper knots include a double overhand (barrel) knot or a figure-eight tied in each end of the rope. Whatever the knot, it needs to be bulky enough not to pass through the device, and tied with enough tail. Many climbers make it a routine to tie stopper knots in both rope ends before rappelling, especially when they aren't certain the rope reaches the next station or the ground.
Sources
- Rappel & lowering safety — American Alpine Club
- Knots & rope work — The Mountaineers