Large Single Pulley, Aluminum, 70 kN, Bushing

This large single pulley pairs an aluminum frame with a bushing sheave and a 70 kN rating, giving tree crews a strong, simple pulley for redirects, haul systems, and light rigging. A large sheave runs more efficiently than a small one and is gentler on rope.

Bushing versus ball bearing

A bushing sheave turns on a plain sleeve rather than ball bearings. It is a little less efficient, but it handles grit, sawdust, and heavy static loads well and needs little care. For redirects, tensioning, and haul systems on a tree job, that is a reasonable trade.

A large sheave reduces how sharply the rope bends, which cuts rope wear and friction. Use rope within the manufacturer's diameter range and remember that 70 kN is a breaking strength, not a working load. Apply the stated working load guidance and keep the whole system within the weakest component's rating.

The aluminum frame keeps it light enough to carry up the tree, so it can serve as a canopy redirect for a pull line as well as a ground-level pulley. Clip it with a carabiner rated for the load and keep the gate closed and locked.

Inspection

Before use, look over the side plates for cracks, check the axle and bushing for play, and make sure the sheave turns freely. See other pulleys in our rigging pulleys section.

Rigging forces are dynamic and can be several times the weight of the piece. Follow the manufacturer's ratings and ANSI Z133, inspect every component before the job, and keep rigging work to trained crews.