Learn About Basic Climbing Knot Types

Understanding the Basics of Climbing Knots

Climbing knots are specialized ties used to secure ropes, attach climbers to safety equipment, and create anchors on rock faces and indoor climbing walls. Unlike decorative knots or sailing knots, climbing knots must hold under significant weight and stress. A climber's life depends on these knots working correctly every single time they are tied.

There are several categories of climbing knots, each serving a different purpose. Some knots are designed to tie a climber into a harness, others create loops that won't slip under load, and still others join two ropes together. Understanding which knot to use in which situation is a fundamental skill for anyone learning to climb, whether they climb outdoors on natural rock or indoors on artificial walls.

Climbing knots differ from other types of knots because they must meet specific safety standards. The American climbing community follows guidelines established by organizations like the American Alpine Club and ACCT (American Climbing Coaches Association). These organizations conduct extensive testing to determine which knots are reliable and which ones are not. Research has shown that certain knots hold stronger than others, and some knots can fail under specific conditions.

Learning to tie climbing knots correctly takes practice. Most experienced climbers spend hours practicing these knots before they ever climb outdoors or participate in serious climbing activities. Indoor climbing gyms and climbing schools offer instruction in proper knot-tying technique. The knots themselves are not difficult to learn, but the muscle memory needed to tie them consistently and correctly under stress takes repetition.

Practical Takeaway: Before climbing with any knot, practice tying it at least 20 times on the ground where mistakes do not create danger. Check your knots against instructional diagrams and have experienced climbers review your technique.

The Figure-Eight Follow-Through Knot

The figure-eight follow-through knot is one of the most important knots in climbing. This knot is used to tie a climber into a harness, making it the connection between the person and the rope. In climbing, this knot is sometimes called a "figure-eight on a bight" or simply the "follow-through eight." The knot has been tested extensively and is considered the standard tie-in knot for sport climbing, outdoor climbing, and most indoor climbing activities.

To tie the figure-eight follow-through, you start by creating a figure-eight knot in the rope about an arm's length away from the rope's end. Then, you thread the rope's end back through the knot in the reverse direction, following the original path. This creates a strong, symmetrical knot with two parallel strands running through the climber's harness loops. The beauty of this knot is its simplicity and its reliability. When tied correctly, the knot remains secure even if the rope moves or shifts slightly.

Testing data from climbing organizations shows that the figure-eight follow-through knot maintains approximately 75-80% of the rope's full breaking strength when tied correctly. A typical climbing rope breaks at around 5,000 to 6,000 pounds of force. The figure-eight knot would hold at approximately 3,750 to 4,800 pounds. In real climbing situations, the forces experienced rarely exceed 1,200 to 1,500 pounds, even with falls, which means this knot provides a substantial safety margin.

One critical aspect of the figure-eight follow-through is the need to verify it before climbing. Climbers should perform a visual check to ensure both sides of the harness attachment points are threaded through the knot. A common error occurs when climbers forget to thread through both attachment loops on the harness. Some harnesses have two separate attachment loops specifically to prevent this error.

Practical Takeaway: When tying your figure-eight follow-through, count the strands going through your harness. Both attachment points should have rope running through them. Before climbing, have your partner check your knot by tugging on it gently and reviewing its appearance against a reference image.

The Bowline Knot and Its Role in Climbing

The bowline is an ancient knot that has been used for thousands of years in sailing and rope work. In climbing, the bowline creates a fixed loop at the end of a rope that won't slip or tighten under load. The knot is sometimes called the "king of knots" because of its versatility and reliability. While less common than the figure-eight as a tie-in knot, the bowline appears in many climbing scenarios, particularly in creating anchors and backup loops.

The bowline works by creating a loop in the rope and using a specific wrapping technique to secure that loop. The working end of the rope wraps around the standing part of the rope and comes back through the loop, creating a knot that is strong in all directions. One advantage of the bowline is that it is relatively easy to untie after being loaded, unlike some other knots that can become difficult to release after holding weight.

In climbing, the bowline is particularly useful for creating anchor points when climbers need to set up a belay station or create a backup loop on a rope that is already tied. Climbing teams often use bowlines when they are rappelling (descending the rope) or when they need to quickly attach to a piece of climbing gear. The knot has been tested extensively and maintains approximately 70-75% of rope breaking strength, comparable to the figure-eight.

However, the bowline has one significant drawback that has been documented in climbing literature. If the bowline is not dressed correctly (meaning the knot is not tightened evenly), it can roll or slip under certain conditions, particularly if subjected to repeated jerking motions. For this reason, many climbing instructors recommend backing up the bowline with a second knot, such as an overhand knot tied with the working end. This backup knot prevents the bowline from rolling while adding minimal bulk.

Practical Takeaway: If you tie a bowline during climbing activities, finish it with an overhand knot backup on the working end. This takes only a few extra seconds and significantly increases the reliability of the connection.

The Double Fisherman's Knot for Rope Joining

The double fisherman's knot is used to join two ropes together, creating a connection that is nearly as strong as the ropes themselves. This knot appears frequently in climbing when climbers need to extend a rope, create a longer sling, or repair a rope that has been damaged. The knot consists of two identical overhand knots, each wrapped around the standing part of the opposite rope. When tightened, these two knots slide together and hold firm.

To tie the double fisherman's, you lay two rope ends alongside each other. With the first rope end, you tie an overhand knot around the second rope, then with the second rope end, you tie an identical overhand knot around the first rope. When you tighten both knots by pulling on the standing parts of the ropes, the two overhand knots slide together and create a secure connection. The result is a knot that holds at approximately 75-80% of rope breaking strength, making it reliable for most climbing purposes.

Climbing teams frequently use the double fisherman's knot when setting up rope systems for rappelling, when creating cordelette anchors (using smaller diameter rope or webbing to create attachment points), or when joining dynamic climbing ropes with lower-strength backup ropes. The knot's main advantage is that it works equally well with ropes of different thicknesses, making it extremely versatile in the field.

One important consideration with the double fisherman's is that it can be difficult to untie after holding significant load. The knot can tighten and become very difficult to release, particularly if it has been shock-loaded (suddenly jerked tight). For this reason, climbers sometimes prefer the "offset double fisherman's" or other alternative rope-joining knots when they anticipate needing to untie the knot later. Testing has shown that the double fisherman's is reliable and safe, but advance planning about whether you will need to untie it makes good climbing sense.

Practical Takeaway: When tying a double fisherman's knot, tie it with approximately 6 inches of rope beyond the overhand knots on each side. Pull on both standing parts of the rope with significant force to seat the knot properly before using it in climbing.

Specialty Knots: The