Knot of the Week HD: Figure-8, Threaded Figure-8 and Figure-8 on a Bight - ITS Tactical

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August 24, 2015Bends, Loops

Knot of the Week HD: Figure-8, Threaded Figure-8 and Figure-8 on a Bight

Knot of the Week HD: Figure-8, Threaded Figure-8 and Figure-8 on a Bight

Figure-Eight Knot of the Week

In this week’s continuing reintroduction of our Knot of the Week series shot in HD, I’ll be going through the Figure-Eight Bend and a slew of variations on one of the most well known climbing knots. We’ll first look at the standard Figure-Eight, talk about joining lines together with the Figure-Eight Bend, jump over to a Figure-Eight on a Bight, compare that with the Threaded Figure-Eight and lastly finish up talking about the Double Figure-Eight on a Bight.

The Figure-Eight is in my group of essentials when it comes to climbing knots and I’ve used many of these variations over and over again when climbing recreationally and as a BSA Certified Climbing Instructor for my son’s Boy Scout Troop. Remember that tying knots is a perishable skill that must be practiced until it becomes second nature.

Figure-Eight Knot » Bends

(Strength: 4/Security: 4/Stability: 3/Difficulty: 1) See below for what these ratings mean.

While the title and rating here is for joining two equal lines together with a Figure 8 bend, it doesn’t take into account the increased security gained with backing up each end.

The Figure-Eight Bend is used to join two lines of equal thickness and can be difficult to untie after being heavily loaded. The pattern created when tying the Figure-Eight gets its name from the “8” that’s made and makes a tied Figure-Eight easy to inspect to ensure it was done so correctly.

Uses for Figure-Eight and Variations

  • Figure-Eight (Bend) – Join two equal lengths of rope together in a secure bend
  • Figure-Eight on a Bight (Loop) – Creating a loop to connect to an anchor point or for nearly any usage like a lowering a pack, etc.
  • Threaded Figure-Eight (Loop) – Tying into a Climbing Harness
  • Double Figure-Eight on a Bight (Loop) – Securing a rope to a single anchor point, or equalizing loops between two anchor points

Figure-Eight on a Bight / Threaded Figure-Eight

The Figure-Eight on a Bight is ideal for tying into any point along a line to act as an anchor point. If it’s tied in the end of a rope you should always back it up. While this can be tied in the end of a rope, there’s a safety risk if clipping this into a harness via a carabiner during a Lead Climbing situation.

A carabiner can become cross-loaded in a fall and become twisted, producing a weak link. The shock can be caught by the gate of the carabiner, which carries a reduced strength. The kN (Kilo Newton) rating of a carabiner only holds true if the carabiner is loaded appropriately.

Threaded Figure-Eight Knot

To avoid this issue and others associated with introducing a carabiner into the mix, use the Threaded Figure-Eight to tie directly into a harness. The Threaded Figure-Eight is also known as a Figure-Eight Follow-Through.

Note: The rope used in the video and photos above is BlueWater Ropes Assaultline Static Rope.

Double Figure-Eight on a Bight

Also known as the Super Eight, Canadian Eight, or Double-Loop Figure-Eight, the Double Figure-Eight on a Bight can be advantageous in situations that might call for the extra security of a second loop. It’s also easier to untie after being loaded when compared to the other variations of the Figure-Eight mentioned above.

This can be used to secure a rope to an anchor using both loops, or independently by adjusting each of the “bunny ears” to equalize between two anchor points. Don’t use a single loop, leaving the other unused. If any slipping occurs you could wind up with a melted rope due to the friction produced.

Ratings

Strength/Security/Stability/Difficulty

Each knot will be assigned a rating from 1-5 (1 representing the lowest score) based on the following four properties:

Strength – All knots will weaken the strength of  a rope, however, there are knots that are stronger than others. The scale here will reflect how strong the rope remains with the specified knot.

Security – The security scale refers to how well the knot will stay tied, and resist coming loose under a normal load.

Stability – Stability refers to how easily the knot will come untied under an abnormal load (i.e. the knot being pulled in a direction it was not intended to) A lower score here represents instability.

Difficulty – The lower the number, the easier a knot is to tie.

Discussion

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