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Yale Kernmaster 11mm (7/16”) Rope - Blue/Orange

Yale Kernmaster Rope Yale Kernmaster Rope Yale Kernmaster Rope
Yale Kernmaster 11mm (7/16”) Rope image Yale Kernmaster 11mm (7/16”) Rope

Buy Yale Kernmaster 11mm (7/16”) Rope

11mm x 120'
11mm x 150'
11mm x 200'
11mm x 300'
By the Foot

Yale Kernmaster 11mm (7/16”) Rope with Viking (sewn) Tight-Eye


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Leave instructions for which splices go with which ropes in the 'comments' field during checkout, along with the sizes for any custom size eyes, and any instructions for thimbles, rope snaps, or other hardware to add to the splice. (Hardware must also be present in your cart to add it to the splice.)

11mm (7/16”) • kernmantle • 7,100 lb ABS • 3% elongation at 10% ABS • 5.5 lb per 100' • sewn eyes only.

Kernmaster is a 48-strand Kernmantle rope with an outer polyester jacket over an energy-absorbing nylon core. Kernmaster makes an excellent SRT line. It is very low stretch and works great in all of your favorite Single Rope hardware.

Yale's Kernmaster is a Kernmantle climb line with good energy absorption. The core fibers of Kernmaster are braided, unlike most other kernmantles, which makes it perform more like a 24-strand, allowing for both access and DdRT climbing using quick hitches. The supple hand of Kernmaster works well with hybrid SRT devices like the Hitch Hiker. CE/EN1891 rated.

Quick Overview: 7/16” diameter, 7,100 ABS, 5.5 lb per 100’.


Video overview of Kernmaster by Niceguydave

  • Excellent SRT Rope
  • Professional grade
  • Smooth cover for mechanical ascension
  • Low stretch
  • Tight braid
  • Light weight
Manufacturer : Yale Cordage
Made in : USA
Diameter : 7/16” / 11 mm
Average Strength : 7,100 lb / 3,220 kg
Construction : Kernmantle
Material : Polyester / Nylon Core
Wt. per 100’/100m : 5.5 lb / 8.2 kg
Elastic Elongation : 3% at 10% ABS
Hand Spliceable : No
Sewn Spliceable : Yes

Dynamic Energy in Arborist Rope

This great article at Yale Rope's website explains the how the ability of a rope to absorb impact is affected by the elasticity of the rope. Breaking strength is not the only important factor in determining if a rope is right for the job. Dynamic Energy in Arborist Ropes

ANSI Z133-2017

The American National Standards Institute (ANSI) has released the ANSI Z133 safety requirements which apply to arboricultural operations.

Arborist Climbing Ropes are required to have a minimum breaking strength of 5,400 lb (24 kN) when new, and should be no smaller than 1/2” (12.7mm) unless the employee has been trained in the use of smaller line (down to 7/16” / 11mm), and the line's working elongation should not exceed 7% at 540 lb load.

Kernmaster 11mm (7/16”) meets ANSI Z133-2017 standards, so long as the user has been trained in the use of smaller diameter lines.

The full ANSI Z133 safety requirements are available on our tree care standards page.

Customer Reviews

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Rated: Excellent Review by: Manitou Tree Service

“ This is a great SRT rope! While it is still hard for me to get used to no "boing" ascending a rope(rock and ice climber for 30 years), the handling qualities are great with this rope. I do not like the feel of non-kernmantel ropes and have recently went back to them for tree work. We live in a rain forest and this rope performs well dry OR wet. It knots well and does not kink up like other static lines I have used in the past. The price is very great for the quality! Thanks! ”

Rated: Excellent Review by: Ken

“Best rope period. Low stretch but good enough to work off single rope, easy on the hands for double rope, super light, firm grip, not slippery and really tough cover. The colors aren't 80s sunglasses flashy and still easy to see in the tree. Wesspur's price is a steal and a smooth setup for any gear with their pro splices.”

Rated: Excellent Review by: Niceguydave

“This rope from Yale has been around for a while. It turns out that it makes an excellent SRT line when using hybrid work systems like the Ropewrench, Unicender, and Hitchhiker. It is a Kernmantle rope that utilizes a braided core instead of the more common parallel strands. It maintains excellent hand, knots well, and doesn't get 'cabled' or stiff like some static lines do when used. It has a Nylon core, which gives it energy absorption. This is an excellent choice for folks who are working a tree using SRT.”

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