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Every system needs friction hitches, which are constructed with Cord. Don’t be confused that different companies might call it “Utility Cord” or “Prusik Cord” or “Hitch Cord”. Just be sure that the product chosen is correct for the application.
Rope vs Cord
Don’t use rope as cord. This article summarizes it well: Rope vs Cord
Cord Diameter
When tying most friction hitches including all of JRB’s original designs, the diameter of the cord must smaller than the rope diameter. Although the ideal combination can vary with the hitch, rope and cord, a 70-75% ratio is a general recommendation. However, there are cases where anything from 60 to 87% may perform well. Also be aware that the performance characteristics vary based on the flexibility of the cord: flexible, bendable cords work at larger ratios than stiff cords. Here are some general recommendations for popular rope diameters. Note that the actual diameter of a rope or cord may differ from the stated diameter:
| Rope Diameter | Cord Diameter | Ratio |
|---|---|---|
| 8 mm or 5/16 in | 6 mm | 75% |
| 9.5 mm or 3/8 in | 7 mm | 74% |
| 11.1 mm or 7/16 in | 8 mm | 72% |
Length
The length of the cord needed varies based on the application. See the Length Spec’s page for details.
Cutting and Sealing Cords
When cutting nylon or polyester cords, melting the ends using a flame for about 10 seconds and then smoothing with a rag is recommended. Heat resistant cords can be sealed with tape or heat shrink tubing or a rope whipping sealer.
Cord Recommendations
Read all of the recommendations before making a decision.
Prusik Loops
6 mm Sterling TRC Sewn Prusik Loops, for tying the Hedden Knot on 8-11 mm ropes. JRB recommends the 19″ length:
Teufelberger Ocean 8mm cord is very bendable and works on 9.5mm and thicker ropes.
Sterling Flex 8mm Cord works great on 11mm ropes:
Sterling 7mm Accessory Cord is made of Nylon, bends well and is JRB’s favorite all-around cord. It generally works on ropes from 8mm to 11.4mm. Buy a bit of extra, like a 50′ length. You will put it to use in practicing.
7mm Sterling Cord is also available on Amazon:
6 mm Sterling TRC is a very rugged cord, and grips harder, best suited for 8mm ropes.
6.5 mm Bluewater Dynamic Cord (nylon) performs very well on 8mm ropes:
https://www.rockandsnow.com/62549/Bluewater-Dynamic-Prussik-Cord-6.5mm/
Note: in side by side testing, the TRC and Bluewater Dynamic cord performed identically. TRC was slightly more ‘grippy’. Both are fine choices.
6mm Nylon cord. Manufacturers generally do not recommend this cord for life safety applications. JRB uses it in utility applications such as the friction hitches for platforms and sticks (when tied in and on minimal slack) such that he can can sustain a loss of his footing at anytime and not jeopardize safety. Consider your application carefully and use at your own risk.
Sterling 6mm Cord on Amazon
Sterling RIT 900 is also a good option for 8mm ropes. It grips harder and has a smaller profile, so harder to break. Please research the details such as UV exposure and ensure that the application is appropriate for use.
Bluewater Titan 5mm Cord – its really strong, but is stiff and has a lot of memory.
Atwood 5.6mm Battle Cord – JRB has not tried this cord, and it is not listed for life safety applications, but the 2650lb strength is interesting and so, let’s test it out for non life safety applications, ok?
Paracord
Paracord is not used for life safety applications; it is used for rigging and “paracord presets”, which are left in the tree after the use of a throwball.
Paracord Planet, up to 1000 ft spools
Cord Inspection / Replacement
Be sure you inspect and replace cords as appropriate. Even with moderate use in a hunting system, it’s a good idea to replace your friction hitches every season, and inspect them regularly. Recommended rope life is typically specified by the manufacturer, but 5 years maximum working lifespan is a good rule of thumb.
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