380 Series Hook Blocks


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380 Series Hook Blocks

The patented McKissick Split-Nut® is the standard retention system for standard crane blocks up to 100 tons.

  • Wide range of product available.
  • 5 to 300 tons – Larger Models Available-
  • Sheave Sizes: 10" to 30".
  • Wire Line Sizes: 7/16" to 1-3/8".
  • Manufactured by an ISO 9001 and API Q1 certified facility.
  • All single point shank hooks are genuine Crosby®, forged alloy steel, Quenched and Tempered, and have the patented QUIC-CHECK® markings (Duplex hooks are available on all sizes).
  • All 380 Blocks are furnished standard with Roller Bearings.
  • Reeving Guide Standard – All Models.
  • Blocks thru 25 tons use 319N style hooks with S-4320 latches.
  • Sheaves lubrication through center pin–separate lube channel to each bearing.
  • Sheave fully protected by side plates.
  • Dual action hook (swings and rotates).
  • Repair parts available through world wide distribution network.
  • Design Factor of 4 to 1 (unless otherwise noted).
  • All 380 blocks, 16" and larger, are furnished with McKissick® Roll-ForgedTM sheaves with flame hardened grooves.
  • “Look for the Orange Hook…the mark of genuine McKissick® quality”.

Options Available:

  • Bronze Bushed Sheaves
  • Duplex Hooks
  • Swivel Tee and Shackle Assemblies
  • Sheave Shrouds
  • Anti Rotation Hook - Locking Device
  • Plate Steel Cheek Weights
  • Third party testing with Certification available upon request.

Dead End Chart— Double, Triple & Quad Sheave Blocks

Dead End Chart— Double, Triple & Quad Sheave Block Specifications

+ US-422T Terminator Style.


Thickness (E) shown is for blocks containing cheek weights (Light Medium - LM, Medium - M, and Heavy - H). The thickness (E) for non weighted blocks (Light - L) is measured over side plates.

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

381—Single 382—Double

383—Triple 384—Quad

385—Quintuple 386—Sextuple

387—Suptuple 388—Octuple

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