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CMI 3/4” Steel Arborist Block

 CMI 3/4” Steel Arborist Block  The upper sheave and screw are captive - no chance of losing pieces in the tree. Block accepts 3/4” Slings and Ropes Save on a combo sling & block kit
CMI 3/4” Steel Arborist Block image CMI 3/4” Steel Arborist Block

Buy CMI 3/4” Steel Arborist Block

CMI 3/4” Block
Block with 3/4” Loopie

This arborist block from CMI is a simple, robust rigging block for tree removals. The steel arborist block is very basic in design so it can be offered at a very affordable price. The block has a respectable minimum breaking strength (MBS) of 25,000 lb. The upper sheave and screw are retained when the side-plates are opened to install a rigging sling, which eliminates the possibility of a dropped sheave or screw. The block accepts rigging ropes of up to 3/4” diameter, and tree rigging slings up to 3/4”.

There are other arborist blocks with more advanced features or more polished design, but the basic CMI 3/4” steel arborist block is a great value for the money.

Purchase this kit as a package with a 3/4” x 2-8’ Loopie sling and save.


CMI 3/4” Arborist Block Overview by Niceguydave

  • Affordable
  • Captive upper sheave
  • Durable
Manufacturer : CMI
Made in : USA
MBS : 25,000 lb / 111 kN
WLL (5:1) / (10:1) : 2,500 lb / 5,000 lb
Max Rope Diameter : 3/4”
Max Sling Diameter : 3/4”
Sideplate Material : Zinc-plated steel
Sheave Material : Aluminum
Axle Material : Stainless steel
Upper Sheave Diameter : 1 3/4”
Lower Sheave Diameter : 2 3/4”
Height : 6.5”
Width : 4”
Weight : 3.65 lb

ANSI Z133-2017

The American National Standards Institute (ANSI) has released the ANSI Z133 safety requirements which apply to arboricultural operations. Components of a rigging system must be used within their Working Load Limits.

The CMI 3/4” Arborist Block is ANSI compliant when used within the manufacturer Working Load Limits.

A green log weight chart (found in the Samson Rigging Wheel) will aid in determining loads in tree rigging.

The full ANSI Z133 safety requirements are available on our tree care standards page.

Customer Reviews

Add your own review

Rated: Excellent Review by: Shawn

“ I put it through it's pases today jyst trying it out. And it can take some abuse. I've been looking for a block for the main rigging point and I also run some ultra sl8ngs with #1 rings as redirects. It's a smooth rigging system. Thanks!!!! ”

Rated: Excellent Review by: Sexton Tree Service

“Bought this block last year and I must say I use it more often than not and it has seen several large loads and has preformed well. Only complaint is the screw/bolt loves dirt and grit and will get tuff and not want to screw out at times. Other than that if your looking at this block go ahead you will not be disappointed.”

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