Tree rigging block

Tree rigging block DEFAULT

Arborist Blocks

You've come to the right place if you're looking for a good rigging block for tree work. We offer top brands like CMI, ISC and Kong. We find the most common size of bull rope our customers use is 5/8" (the rest generally use 1/2" or 3/4"). In this size, one block really stands out as a great value, and that's the CMI RP Steel Block. It's beefy, tough and priced great, with a strong 25, lbs Breaking Strength.

What About Bigger Blocks?
When it comes to rigging, bigger often is better. If you're using a 3/4" rigging line, we recommend checking out the ISC RP Yellow Spring Block. Despite its large size, this block isn't terribly heavy thanks to its aluminum design. But if you're really getting into the big stuff, and you have a 1" Rigging Line, or perhaps a 1" dead-eye sling, then you should use the CMI RP Rigging Block. This block looks cool, but it also has a build quality that feels special. It also has a very impressive 68, lbs Breaking Strength, so go ahead and use it on your toughest tree removal job!

Related Items:Rope & Cordage | Tree Slings | Port-A-Wraps | Endless Round Slings | Shackles

Sours: https://www.westechrigging.com/blockspulleys-arborist-blocks.html

Double block rigging

Double block rigging system setupI have been witness only once to the failure of rigging equipment when a colleague was removing a large London Plane tree about 8 years ago. London Plane is very dense and heavy wood. The tree had been pollarded multiple times over the years at the same point. When it came to rigging this piece out, he continued to tie up the chuck in a conventional negative rigging system around the whole of the pollard point. If a quick calculation had been done we would have known that once rigging off, the force this piece would generate would by far exceed some of the rigging component’s breaking strength. The inevitable happened and the rigging line snapped at the point where the knot had been tied. Luckily none of the crew where injured but a retaining wall and part of the driveway were damaged and this was a luxury property in St. Johns wood, London..

As Climbing Arborists we should constantly be looking for new ideas, techniques and equipment to use in order to overcome different tasks that we may be face in the future. This industry seems to be evolving everyday so we should always be trying to stay at the top of our game.

Double Block RiggingA few months ago I was shown the rigging technique ‘Double Block Rigging’ by Gareth Tudor-Jones of Bartlett Tree Experts. Gareth did some field-testing with this rigging technique using load cells to demonstrate its advantage and get real life readings and results.

The double block rigging technique is a great technique for rigging large/heavy pieces as it helps to spread the force of the piece(s) being rigged. It uses more rope in the system to help absorb energy, using more components to help spread the load and reduce the shock load on the stem its self.

Sours: https://www.climbingarborist.com/double-block-rigging/
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ISC Compact 1/2” Rigging Block

ISC Compact 1/2” Rigging Block

1/2” Block & 1/2” x 4’ Loopie Sling

At approximately half the size of the standard small rigging pulley and weighing in at only 1 lb, the new Compact Rigging Pulley offers a highly impressive strength to weight ratio with an 85kN (19 lb) MBS and a WLL of 17kN (3, lb.) Can be used with rigging slings up to 5/8", and runs 1/2" tree rigging rope.

19, lb MBS, Manufacturer WLL 3, lb. Weighs 1 lb. ISC Part RP

Read reviews

Rated: Excellent Review by: Wickhams Tree Service

I would recommend this product to anyone. I constantly lower very large sections of trunk and branches.

Rated: Excellent Review by: Jamz Luce

“ Love it ! Weighs only 1 lb with a 3, lb WWL ! My go to block for loads in its limits. The spring style pin has the advantage over threaded for quickness and does not have the risk of un-threading with repeated use. ”

ISC Small 1/2" Arborist Spring Block

1/2” Block & 1/2” x 4’ Loopie Sling

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.

22, lb MBS, Manufacturer WLL 4, lb. Weighs 3 lb 6 oz. ISC Part RP

5/8” Capacity Aluminum Spring Block

ISC Small 5/8" Arborist Spring Block

5/8” Block & 5/8” x 6’ Loopie Sling

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, lb MBS, Manufacturer WLL 4, lb. Weighs 3 lb 4 oz. ISC Part RP

ISC Medium 5/8" Arborist Spring Block

5/8” Block & 5/8” x 6’ Loopie Sling

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, lb MBS, Manufacturer WLL 6, lb. Weighs 4 lb 9 oz. ISC Part RP

ISC 5/8” Flame Rigging Pulley

5/8" Pulley w/ 3/4" x 8' Loopie

Stainless steel rigging block from ISC. This tough rigging pulley has a screw-locking top pin and will accept up to a 1" rigging sling and run 5/8" rigging lines. The ISC Flame pulley has flame cut-outs on the side, which help reduce weight (only 3 and a half pounds) while maintaining an impressive kN MBS and lb Working Load Limit.

kN (22, lb) MBS. Weighs 3 lb 8 oz. ISC Part RP

ISC Medium 3/4" Arborist Spring Block

3/4” Block & 3/4” x 8’ Loopie

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, lb MBS. Weighs 4 lb 14 oz. ISC Part RP

Video product overview of the ISC Arborist Spring Block by Niceguydave.

Read reviews

Rated: Excellent Review by: Canadian Tree Pro

“ Love these ISC blocks. Easy to use, light and durable. Quality craftsmanship. My only choice in heavy rigging applications. We do a lot of work pulling very large trees with excavators. When a redirect is needed these blocks are bomb proof! The smooth edges all around are gentle on ropes and the pin is flawless plus you cant drop it from the tree! ”

CMI 1/2” Compact Rigging Block

CMI 1/2” Compact Rigging Block

1/2” Arborist Block

1/2” Block & 1/2" x 10' Tenex Sling

1/2” Block & 1/2" x 2 - 4' Loopie Sling

This compact rigging block only weighs 1 pound but has an impressive MBS of 21, lb with a 1/2” rope capacity. screw in top knob ensures a positive lock. Stainless steel axles, aluminum sideplates and wheels round out the package.

Recall for blocks built prior to May,

CMI issued a recall in April for this block. Blocks purchased after May, are not subject to recall, as the issues have been identified and fixed. Please return blocks purchased in Aprlil or earlier for inspection to: CMI CORP. MILL ROAD, P.O. BOX , FRANKLIN, WV

CMI 5/8” Stainless Steel Arborist Rigging Block

CMI 5/8" Stainless Steel Arborist Block

Block & Loopie Sling Kit

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.

Note: With this style of block, care must be taken that the relatively sharp side plates do not contact the rope.

28, lb MBS, Manufacturer WLL 4, lb. Weighs 2 lb 5 oz.

Block & Loopie Kit contains: CMI 5/8" Stainless Block + 5/8" x 6' Loopie Sling

CMI 3/4” Stainless Steel Arborist Block

CMI 3/4” Stainless Steel Arborist Block

3/4” Block & Loopie Sling Kit

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.

Note: With this style of block, care must be taken that the relatively sharp side plates do not contact the rope.

40, lb, MBS, Manufacturer WLL: 6, lb. Weighs 5 lb 10 oz.

Block & Loopie Kit contains: CMI 3/4" Stainless Block + 3/4" x 8' Loopie Sling

3/4” CMI Steel Arborist Block

3/4” Block & 3/4” x 8’ Loopie Sling

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.

Note: With this style of block, care must be taken that the relatively sharp side plates do not contact the rope.

25, lb MBS. Weighs 3 lb 10 oz.

Video Overview by Niceguydave.

Read reviews

Rated: Excellent Review by: Shawn

“ I put it through it's pases today just 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 tough and not want to screw out at times. Other than that if your looking at this block go ahead you will not be disappointed.”

CMI 3/4” Aluminum Arborist Block

CMI 3/4” Aluminum Arborist Block

3/4” Arborist Block

3/4” Block w/ 5/8" x 12' Eye Sling

3/4” Block w/ 3/4" x 8' Loopie

CMI's compact aluminum block is small and strong with a large capacity and robust design. Knurled knob for easy push and turn opening. Orange alloy sideplates, 3-inch aluminum sheave, bronze bushing and stainless steel axle. Proudly made and manufactured in the USA.

51, lb MBS. Weighs 2 lb 15 oz.

Read reviews

Rated: Excellent Review by: JB Holdway

“The CMI RP is an excellent tool. Light and easy to rack on the harness and rig aloft. It is the smallest, strongest, largest capacity aluminum block on the market. Approximately: 3"x6"x4"(thick), ~3" sheave (~" inner), ~3lbs MBS 51,lbs, SWL 5,lbs, Max. rope 3/4" Spring Block style. The side plates could be a little larger to protect the rope from contact with the tree. And, the knob could be a little smaller. But, that's just personal preference. Overall: An excellent tool - a good investment.”

1” Aluminum Arborist Block

1” Block & 3/4” x 8’ Loopie

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, lb. and manufacturer working load limit of 13, lb - over 6 tons. For years the only 1” we could offer cost almost $ 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 ” x 6” yet weighs in at only 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, lb MBS. Weighs 6 lb 10 oz.

DMM Impact Blocks

DMM 5/8" Impact Block

5/8” Block & 5/8” x 6’ Loopie Sling

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, lb MBS. Weighs 4 lb.

DMM 3/4" Impact Block

3/4” Block and 3/4” x 8’ Loopie Sling

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, lb MBS. Weighs 7 lb 10 oz.

Video product overview of the DMM Impact Block by Niceguydave.

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Sours: https://www.wesspur.com/rigging/arborist-blocks.html
How to tie a Cow hitch - Arborist knot tying for rigging

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Block tree rigging

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