3/4" capacity blocks and pulley are a good choice for serious rigging work that requires high strength rigging ropes and slings. Because of their larger capacity, 3/4" Arborist blocks will accept larger and stronger ropes such as 3/4" Stable Braid. All of the blocks listed below are arborist blocks, designed for applications where shock-loading is possible. For more information on using blocks and pulleys in tree work, check out the Art and Science of Practical Rigging. Click on a picture for a larger image.
Please note that Working Load Limits (WLL) are listed at 10% of the Breaking Strength (Breaking Strength.) This is a safer ratio to use than the 5:1 ratio commonly used for lifting applications, as tree work involves the risk of shock loading, and it is the same ratio used when calculating the Working Load Limit of Arborist Rope.
This best selling Arborist Block features a wide upper bushing to maximize sling strength and wide side plates to protect the rope from abrasion. One-piece design eliminates lost parts. 3" lower sheave will accept bull ropes up to 3/4" diameter. Stainless steel side plates, aluminum bushing, and zinc-plated steel axle means this pulley stands up to the elements as well as the load.
WLL 4,000 lbs. Breaking Strength 40,000 lbs.
The Hobbs Blocks is a great piece of hardware in any capacity. In the 3/4" capacity it is a rugged workhorse with bolted side plates, bronze bushing, and heavy duty aluminum body that stands up to heavy use. Impressive breaking strengths, wide cheek plates, and wide sheaves for maintaining good bend radius are some of the great features that have made this a classic design.
WLL 4,000 lbs. Breaking Strength 40,000 lbs.
The 3/4” capacity spring block is one of our most popular large arborist blocks. The design is compact and the unique upper sheave design is quick to open & close and secures easily, plus it eliminates the chance of dropping a sheave. The side plates are thick aluminum with a yellow powder coating to enhance the durable life of the block. Strong and durable.
WLL 4,500 lbs. Breaking Strength 45,000 lbs.
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