ISC Compact Spring Block - 1/2"



BREAKING STRENGTH85 kN (19,109 lb)

Compact, high-strength rigging pulley from ISC runs ropes up to 1/2" and slings up to 5/8". Rope-friendly surfaces and captive upper sheave.

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.

These excellent rigging block are some of our most popular, combining great quality, design, and value. The design is compact with rope-friendly surfaces and large sheaves. Unique upper sheave design is quick to open/close and secures easily, and eliminates the chance of dropping a sheave. Thick, aluminum side plates are powder-coated to enhance service life.


  • Manufacturer: ISC
  • MBS (kN) : 85 kN
  • MBS (lb) : 19,000 lb
  • MFG WLL : 3,800 lb
  • Max Rope : 13mm (1/2")
  • Max Sling : 5/8"
  • Sheave : 2.125"
  • Weight : 1 lb

Ratings & Reviews

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11/14/2023 9:04 am

Great block

by Samantha

This block is a nice one for a climber. It is light for when you got to carry one up the tree and runs nice and smooth. The spring closure is great even with gloves on. The edges of the block are smooth so its nice on the rope.