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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.
PUL306
WesSpur offers free ground shipping for orders that meet the following criteria:
The free shipping offer covers UPS Ground. UPS Ground runs Monday-Friday. Stump Grinder teeth and Chipper Blades eligible for the free shipping offer are shipped via USPS Priority Mail, in Medium Flat Rate Boxes. UPS Ground requires a physical address for delivery (no P.O. boxes).
WesSpur is happy to offer returns or exchanges on any equipment that is still in new condition. Our return policy is fairly simple and is meant to make your life easy. All regular stock items in new/unused condition may be returned for a full refund less shipping within 30 days of purchase. We do not charge restocking fees.
WesSpur can not accept the return of any used equipment or special-order items.
See our full Returns and Warranty Polic on the help page
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 Wesspur.com!!!! ”
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.”
| 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 |
The American National Standards Institute (ANSI) has released the ANSI Z133 safety requirements which apply to arboriculutral 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.
