Notch Aerial Friction Brake

$209.99 - $219.95

The Notch Aerial Friction Brake is a design based on Carroll C. Bassetts BMS Belay Spool with special changes made for the arborist user. This product replaces both the port-a-wrap and the block, simplifying the system and giving more control to the climber. The AFB TS-1 allows a worker to control appropriate loads without an additional friction brake by simply holding the rope, whether on the ground or in the canopy. The square bollard allows easy movement of the unloaded rope to return the working end of the rope to the climber. You also have the option to purchase the device as a combo which includes a 12 foot long tREX 1/2" dead eye sling.

$209.99 - $219.95


AFB Instructions

Product Profile Video

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AFB In Tree Use


Weight: 3.35 lbs

SWL: 1,000 lbs

Recommended Rope Size: 9/16"

Maximum Rope Size: 3/4"


Manageable Load* 1/2" Stable Braid 9/16" Stable Braid
Two Wraps 260 lbs 350 lbs
Three Wraps 1000 lbs 1000 lbs


* Loads were measured with a static pull, NOT a drop test. Because force is increased by a fall, the manageable load does not necessarily reflect appropriate load weights.


Two wraps are recommended for best use. A wrap is defined as crossing the top of the device. Larger loads (up to 1,000 lbs) can be rigged with three wraps. With three wraps on the device it will be harder to pull rope back while unloaded, and this is recommended only for the occasional large loads or for controlling a rigging line placed at the butt of the load.


The device will deform (but not release the load) at a load of approximately 3,500 lbs.


The Aerial Friction Brake is based on a rope and rescue tool created by Carroll C. Bassett called the BMS Belay Spool. The benefits of this improved, arborist-specific design include:

  • Canopy controllable friction
  • Snatch function allows easy attachment to the anchor sling and the ability to attach a rigging rope mid-line 
  • Extra wide side plates to prevent pinching of the running rope
  • Square bollard decreases surface contact of unloaded rope, decreasing friction and allowing the unloaded rope to be pulled back (more difficult with three wraps)