Progress Capture Pulley 40kN, Double Bushing

A progress capture pulley is a pulley with square-edged side plates that let a prusik or friction hitch sit against it without being pulled into the sheave. This one carries a 40kN rating and uses double bushings, and crews use it to build haul systems that hold their gain between pulls.

How progress capture works

In a haul system you pull, then you have to reset. Without something to hold the rope, you lose what you just gained. A progress capture pulley works with a prusik on the line: as you pull, rope runs through the pulley and the prusik slides against the side plates. When you let go, the prusik grabs and the load stays put.

On tree jobs that might mean pulling a top over in a felling setup, tensioning a speed line, or lifting a heavy piece off a structure. Find more options in our rigging pulleys.

The square-edged side plates are what make it work. A rounded pulley can drag the prusik into the sheave, where it fails to grab, while a progress capture pulley stops the hitch at the side plates every time.

Bushings, rating, and inspection

Bushings are simple and durable and handle high static loads, though they spin with more friction than ball bearings. Keep loads within the rating and remember mechanical advantage makes it easy to overload anchors and trees.

Check the sheave, side plates, and axle for wear, cracks, and play before each use, and inspect the prusik for glazing. Rescue and life-support use must follow the manufacturer's instructions, ANSI Z133, and proper training.

Store it clean and dry, and keep it with the prusiks you use with it so the system is complete when you need it.