Crosby McKissick 680 Construction Blocks

  • Roller bearing sheaves
  • Hanger and Bolt Only models available
  • Third party testing with certification
  • Galvanized finish – Most models
  • Wide Range of product available.
  • 5 to 100 tons – Larger models available.
  • Sheave sizes: 6″ to 24″ O.D.
  • Wire Line Sizes: 3/8″ to 1-1/4″
  • Equipped with genuine Crosby® forged steel, Quenched and Tempered shackles that contain the patented QUIC-CHECK® markings.
  • Design Factor of 4 to 1.
  • All 680 Series Blocks are furnished standard with Bronze Bushings.
  • All 680 blocks 16″ and larger, are furnished with McKissick® Roll-ForgedTM sheaves with flame hardened grooves.
  • Sheaves are lubricated through center pin, with a separate lube channel to each bearing.
  • Single sheave blocks have thimble dead end.
  • Manufactured by an ISO 9001 and API Q1 Certified facility.
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Meets or exceeds all requirements of ASME B30.26 including identification, ductility, design factor, proof load and temperature requirements. Importantly, these blocks meet other critical performance requirements, including fatigue life, impact properties and material traceability, not addressed by ASME B30.26.

680 Construction Blocks: Configurations

Note: See The Crosby Group at for dimensional data. Look for the McKissick block section.




Crosby is the world leader in rigging, lifting, and material handling hardware. We set the standard for quality, training, and technical expertise in the field.

The Crosby Group was the first to:

  • Produce the forged wire rope clip (1880s)
  • Produce wire rope guards on sheaves that can be opened for easy reeving (1925)
  • Forge load rating (working load limit) directly onto product (1958)
  • Quench and temper fittings for more reliable performance (1973)
  • Forge Product Identification Code (PIC) into each product that allows traceability to its respective date of production and material certification (1977)
  • Rate products as Fatigue Rated (1991)
  • Forge patented QUIC-CHECK™ markings into hooks, shackles, and various other rigging products to assist users in determining proper use (1992)
  • Produce a crane block that can be reeved without removing the wedge socket from wire rope in the United States (1996)
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All product warnings: Warnings Page