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Arborist Blocks

Arborist blocks are built to handle the rigors of tree work, with widened cheek plates to protect ropes, and an upper sheave to safely attach a rigging sling.

DMM Impact Block XS

XS Impact Block
pul211
Block & 5/8” x 6’ Loopie Sling
pul211s

WLL 20kN | Brk Str 100kN | Max Rope Diameter 16mm (5/8") | Max Sling Diameter 20mm (3/4") | Dimensions 137 x 82 x 55mm | Weighs 708g

DMM built this compact rigging block to be your best friend for redirect rigging, winching, and snatching stem wood.

The Impact block XS brings the big performance of the Impact Blocks to a compact machine. Integrated sheave and side plates ensure seamless transitions for your rigging line. All-new hollow axle design facilitates complex rigging configurations, and allows you to service the bearings, replace the sheave, or perform other maintenance.

DMM Impact Blocks

DMM Small Impact Block

5/8” Block
pul216
5/8” Block & 5/8” x 6’ Loopie Sling
pul216s

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.

Max rope diameter 16mm (5/8"), 45,000 lb MBS. Weighs 4 lb.

DMM Large Impact Block

3/4” Block
pul308
3/4” Block and 3/4” x 8’ Loopie Sling
pul308s

The Large 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.

Max. Rope diameter 20mm (3/4"), 67,500 lb MBS. Weighs 7 lb 10 oz.

Video product overview of the DMM Impact Block by Niceguydave.

ISC 200 Series Compact Rigging Pulley

14mm (9/16”) Block
pul169

14mm (9/16”) Rope Capacity • 100 kN MBS (22,481 lbf) • 20 kN WLL (4,496 lbf) • Weighs 610 g (1.3 lb) • ISC Part #RP248

ISC built the 200 series rigging pulleys to improve strength, locking, and performance. Reshaped high-strength aluminium frames significantly maximize strength and performance under load. Unique axle/frame interlocking design reduces the inherent tendency to deform or flex under extreme loads. The result is pulleys up to 150% stronger than their predecessors! New “SafeLock” system has an extremely low-profile with quick action of a SpringLock.

ISC 200 Series Small Rigging Pulley

16mm (5/8”) Block
pul220

16mm (5/8”) Rope Capacity • 250 kN MBS (56,202 lbf) • 50 kN WLL (11,240 lbf) • Weighs 1,887 g (4.1 lb) • ISC Part #RP251

ISC built the 200 series rigging pulleys to improve strength, locking, and performance. Reshaped high-strength aluminium frames significantly maximize strength and performance under load. Unique axle/frame interlocking design reduces the inherent tendency to deform or flex under extreme loads. The result is pulleys up to 150% stronger than their predecessors! New “SafeLock” system has an extremely low-profile with quick action of a SpringLock.

ISC 200 Series Medium Rigging Pulley

20mm (3/4”) Block
pul310

20mm (3/4”) Rope Capacity • 300 kN MBS (67,442 lbf) • 60 kN WLL (13,488 lbf) • Weighs 2,682 g (5.9 lb) • ISC Part #RP255

ISC built the 200 series rigging pulleys to improve strength, locking, and performance. Reshaped high-strength aluminium frames significantly maximize strength and performance under load. Unique axle/frame interlocking design reduces the inherent tendency to deform or flex under extreme loads. The result is pulleys up to 150% stronger than their predecessors! New “SafeLock” system has an extremely low-profile with quick action of a SpringLock.

ISC Compact 1/2” Rigging Block

ISC Compact 1/2” Rigging Block

1/2" Compact Block
PUL153
1/2” Block & 1/2” x 4’ Loopie Sling
PUL153S

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 (19 000 lb) MBS and a WLL of 17kN (3,800 lb.) Can be used with rigging slings up to 5/8", and runs 1/2" tree rigging rope.

19,000 lb MBS, Manufacturer WLL 3,800 lb. Weighs 1 lb. ISC Part RP048

Read reviews

ISC Small 1/2" Arborist Spring Block

1/2” Block
pul146
1/2” Block & 1/2” x 4’ Loopie Sling
pul146s

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.

22,480 lb MBS, Manufacturer WLL 4,400 lb. Weighs 3 lb 6 oz. ISC Part RP050

5/8” Capacity Aluminum Spring Block

ISC Small 5/8" Arborist Spring Block

5/8” Block
pul213
5/8” Block & 5/8” x 6’ Loopie Sling
pul213s

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

5/8” Block
pul217
5/8” Block & 5/8” x 6’ Loopie Sling
pul217s

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 4 lb 9 oz. ISC Part RP054

ISC 5/8” Flame Rigging Pulley

5/8" Flame Pulley
pul212
5/8" Pulley w/ 3/4" x 8' Loopie
pul212s

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 100 kN MBS and 4400 lb Working Load Limit.

100kN (22,480 lb) MBS. Weighs 3 lb 8 oz. ISC Part RP056

ISC Medium 3/4" Arborist Spring Block

3/4” Block
pul303
3/4” Block & 3/4” x 8’ Loopie
pul303s

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

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

Read reviews

ISC Large 3/4" Arborist Spring Block

3/4” Block
pul304
3/4” Block & 3/4” x 8’ Loopie
pul304s

ISC's large 3/4" block has the same sleek design and captive upper bushing as ISC's other blocks with an oversized lower sheave and excellent strength.

45,000 lb MBS. Weighs 7 lb 10 oz. ISC Part RP057

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

CMI 1/2” Compact Rigging Block

CMI 1/2” Compact Rigging Block

1/2” Arborist Block
pul112
1/2” Block & 1/2" x 10' Tenex Sling
pul112k
1/2” Block & 1/2" x 2 - 4' Loopie Sling
pul112s

This compact rigging block only weighs 1 pound but has an impressive MBS of 21,900 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, 2018.

CMI issued a recall in April 2018 for this block. Blocks purchased after May, 2018 are not subject to recall, as the issues have been identified and fixed. Please return blocks purchased in Aprlil 2018 or earlier for inspection to: CMI CORP. 338 MILL ROAD, P.O. BOX 535, FRANKLIN, WV 26807

CMI 5/8” Stainless Steel Arborist Rigging Block

CMI 5/8" Stainless Steel Arborist Block

5/8” Block
pul215
Block & Loopie Sling Kit
pul215s

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.

28,000 lb MBS, Manufacturer WLL 4,000 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
pul302
3/4” Block & Loopie Sling Kit
pul302s

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.

40,000 lb, MBS, Manufacturer WLL: 6,000 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
pul306
3/4” Block & 3/4” x 8’ Loopie Sling
pul306s

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.

25,000 lb MBS. Weighs 3 lb 10 oz.

Video Overview by Niceguydave.

Read reviews

CMI 3/4” Aluminum Arborist Block

CMI 3/4” Aluminum Arborist Block

3/4” Arborist Block
pul309
3/4” Block w/ 5/8" x 12' Eye Sling
pul309K
3/4” Block w/ 3/4" x 8' Loopie
pul309S

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 7075 alloy sideplates, 3-inch aluminum sheave, bronze bushing and stainless steel axle. Proudly made and manufactured in the USA.

51,000 lb MBS. Weighs 2 lb 15 oz.

Read reviews

1” Aluminum Arborist Block

1” Block
PUL402
1” Block & 3/4” x 8’ Loopie
PUL402s

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.

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