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Arborist Blocks
Arborist blocks are a very different piece of hardware than your standard pulley. An arborist block is the only appropriate choice for dynamic rigging where the load may fall and exert a shock-load upon the tree rigging system. An arborist block provides a better bend radius and more protection for the tree rigging line due to wide side plates. The upper sheave of an arborist rigging block accommodates a tree rigging sling. A true arborist block is an essential part of any tree rigging system, especially where negative-blocking or butt-hitching is concerned.
3/4” CMI Steel Arborist Block
An affordable and rugged zinc-plated steel arborist block from CMI. Steel body, swinging side plates, and fixed upper sheave. Affordability and durable design make this a great value.
25,000 lb MBS. Weighs 3 lb 10 oz.
CMI Stainless Steel Arborist Blocks
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 5/8” 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.
28,000 lb MBS, Manufacturer WLL 4,000 lb. Weighs 2 lb 5 oz.
CMI 3/4” Stainless Steel Arborist Block
This larger version of the best-selling stainless steel arborist block from CMI accommodates tree rigging ropes up to 3/4” in diameter and features increased strength.
40,000 lb, MBS, Manufacturer WLL: 6,000 lb. Weighs 5 lb 10 oz.
DMM 5/8" Impact Block
DMM's new blocks are designed specifically for the high-impacts of tree rigging & removal. The combination of high quality materials and advanced production processes has ensured a rope friendly, durable and robust product. During design each Impact Block has gone through a thorough dynamic and static testing regime, the end result is a highly functional product with an impressive strength to weight ratio.
45,000 lb MBS. Weighs 4 lb.
DMM 3/4" Impact Block
The 3/4” DMM Impact Block is unparalleled in strength and quality of design. The block is designed to be rope-friendly on all surfaces and accommodates 3/4” rigging ropes on a wide sheave. The large DMM Impact Block is an investment in the ultimate in strength and function.
67,500 lb MBS. Weighs 7 lb 10 oz.
ISC Small 1/2" Arborist Spring Block New in 2013!
.A tough, sleek, and well-engineered arborist block for 1/2” lines. ISC spring blocks are among the best rigging blocks in the world, and this little workhorse brings their great design to bear for 1/2” tree rigging lines.
11,480 lb MBS, Manufacturer WLL 4,400 lb. Weighs 3 lb 6 oz. ISC Part RP050
ISC Small 5/8" Arborist Spring Block
This spring block is one of our most popular 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, powder-coated to enhance the durable life of the block. Strong and durable.
22,480 lb MBS, Manufacturer WLL 4,496 lb. Weighs 3 lb 4 oz. ISC Part RP051
ISC Medium 5/8" Arborist Spring Block New in 2013!
ISC 5/8” spring block in the "medium" style steps up the strength and working load. The rope-friendly edges, large sheave, and retained upper sheave which opens quickly with the twist and push pin are the same as on our popular small ISC block above, but with beefed up strength.
33,720 lb MBS, Manufacturer WLL 6,600 lb. Weighs 3 lb 4 oz. ISC Part RP054
ISC 3/4" Arborist Spring Block
This 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, powder-coated to enhance the durable life of the block. Strong and durable.
33,000 lb MBS. Weighs 4 lb 14 oz. ISC Part RP055
1” Aluminum Arborist Block
Finally, a bigger arborist block is available at better price. CMI has made a great oversized aluminum block with a maximum capacity of 1” and an impressive MBS of 68,000 lb. and manufacturer working load limit of 13,600 lb - over 6 tons. For years the only 1” we could offer cost almost $500. The 1” arborist block allows you to run your biggest ropes through hardware that can handle similarly big loads. This block from the makers of our bestselling stainless steel arborist block is a big 9.25” x 6” yet weighs in at only 6.6 lb.
The block swings open yet the upper sheave is retained so there is no risk of losing it while installing your sling, and you can fit up to a 1” sling for really big jobs. The lower sheave will give you a proper bend radius for 3/4” and larger rope (though it is a bit tight on 1”). The block features anodized aluminum sideplates, an aluminum sheave, bushing, and stainless steel axle.
68,000 lb MBS. Weighs 6 lb 10 oz.