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ISC Arborist Blocks

We have sold ISC aluminum rigging blocks for years, and they have only gotten better! Not only are they very strong, they have been redesigned to be rope and sling-friendly and the captive upper sheave means you can't loose pieces and makes it easy to ensure the block is securely closed and locked before each use.

ISC Compact 1/2” Rigging Block

ISC Compact 1/2” Rigging Block

1/2" Compact Block
PUL153
1/2" Block & 1/2" 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

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ISC Small 1/2" Arborist Spring Block

1/2” Block
pul146
1/2” Block & 1/2” 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” 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 & 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” 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.

ISC Large 3/4" Arborist Spring Block

3/4” Block
pul304
3/4” Block & 3/4” 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.

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