Collection: Pulley Blocks

Redirecting or lifting a genuinely heavy section through rope alone strains both the rope and whoever's controlling it, and a pulley with the wrong sheave size or bearing quality adds friction exactly where smooth running matters most. Single and double sheave blocks change the mechanical advantage available, letting a lighter pull manage a heavier load. This range covers DMM, ISC, CAMP, Rock Exotica and Notch high-strength blocks built for sustained rigging use, not adapted from lighter climbing hardware.

Redirecting or lifting a genuinely heavy section through rope alone stra ...

Buyer's Guide

Pulley Blocks Buyer's Guide

Redirecting or lifting a genuinely heavy section through rope alone strains both the rope and whoever's controlling it, and an arborist pulley with the wrong sheave size or bearing quality adds friction exactly where smooth running matters most. Single and double sheave pulley blocks change the mechanical advantage available, letting a lighter pull manage a heavier load. This range covers DMM, ISC, CAMP, Rock Exotica and Notch rigging pulleys and pulley blocks built for sustained rigging use, not adapted from lighter climbing hardware.

DMM Impact Pulley Blocks

DMM's Impact Pulley Blocks use a forged aluminium body with a large-diameter sheave to reduce friction under heavy, sustained rigging loads. The XS size in green suits lighter negative rigging setups, while stepping up to a larger block increases both working load and the rope diameter it'll comfortably run — check the stated MBS against your heaviest anticipated section before choosing size.

ISC 200 Series Rigging Pulleys

ISC's 200 Series spans four sizes — Compact 14mm, Small 16mm, Medium 20mm and Large 26mm — sharing the same forged construction across a widening sheave and bore. Standardising on the 200 Series across a kit means consistent hardware and bearing quality whether you're redirecting a light branch or running a heavy section through a full-size block.

ISC Hot Forged & Cast Pulleys

The Small and Medium Hot Forged Pulleys (16mm and 20mm) give a lighter, more affordable option than the 200 Series for general rigging, while the Large Cast Pulley handles 20mm rope for heavier setups. The Compact Rigging Pulley suits 13mm rope where a smaller, lighter block is preferable to a full-size unit.

CAMP & Rock Exotica Pulleys

CAMP's Flame Rigging Pulley (16mm) gives a lightweight, sideplate-opening option that's quick to rig mid-line without unclipping an anchor. Rock Exotica's DownRigger Pulley is built specifically to redirect load at a lowering device's anchor point, reducing friction on the rope as it feeds through.

Notch X-Rigging SafeBloc

The X-Rigging SafeBloc combines a low-friction rigging ring with a captive, self-orienting design that keeps it correctly aligned under load without needing a separate karabiner to hold it in place. It's a useful hybrid where a standard open pulley would be awkward to keep oriented through a redirect.

Sheave Bore & Rope Diameter

Every pulley has a maximum rope diameter it's built to run — forcing an oversized rope through an undersized sheave increases friction and accelerates wear on both the rope and the bearing. Check the stated rope diameter against what you're rigging with, and size up if you're running anything close to the pulley's upper limit.

Working Load & Mechanical Advantage Explained

A single pulley redirects load without reducing it, while a double or compound system using two blocks can roughly halve the pull needed to move a given weight, at the cost of pulling more rope through the system. Check the working load limit of the pulley itself, not just the rope running through it, and never exceed the lowest-rated component in the whole rigging chain.