Crosby McKissick M-491 / G-491 Tower / Derrick Hoist Blocks

New design provides the dependability of standard McKissick® Snatch Blocks, along with features that make it perfect for the challenging needs of Tugger Hoist and Tower Erection applications.


  • A wide variety of configurations:
    – 4, 8, 12, 15, 25 or 30 metric ton capacity
    – 3/8″, 7/16″, 1/2″, 9/16″, 5/8″, 7/8″, 1″ and 1-1/4″ wire line sizes
    – Painted or Galvanized finish
  • 8″ and 10″ blocks furnished with dual rated wireline sheaves.
  • Forged steel swivels, tees, yokes and shackles are Quenched & Tempered.
  • Sheave lubrication through center pin for easy maintenance.
  • Design factor of 4 to 1.
  • All blocks 14″ and larger are furnished with McKissick® Roll ForgedTM sheaves with flame hardened grooves.
  • Recessed sideplate design reduces the gap between the sheave rim and the sideplate, allowing the sheave assembly to be captured in the block if loss of center pin occurs.
  • Sealed tapered roller bearings extend the life of the center pin and bearings, and allows for faster line speeds than recommended with standard snatch blocks.
  • Shackle fitting swivels for easy positioning.
  • Suitable for hoisting personnel, contingent upon all employees, including the winch operator, being trained to follow any applicable Federal, local and industry standards.
    – Tugger / Derrick applications: API RP54
    – Tower applications: OSHA directive CPL 2-1.36
  • Holes through side plates are available for secondary block securement device.
  • Manufactured by an API Q1 Certified facility.
  • Type Approval and certification in accordance with ABS 2006 Steel Vessel Rules 1-1-17.7, and ABS Guide for Certification of Cranes.
  • All sizes are RFID EQUIPPED.
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