380 Series Hook Blocks   
Block Inspection
McKissick Block

  • Wide range of product available.
    • Capacity: 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 most sizes).
  • All 380 Blocks are furnished standard with Roller Bearings.
  • Reeving Guides Standard - All Models. 
  • Blocks through 25 tons use 319N Style Hooks with S-4320 latches.
  • Sheave lubrication through center pin - Separate lube channel to each bearing.
  • Sheaves 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-Forged sheaves with flame hardened grooves.
  • Look for the Orange Hook...the mark of genuine McKissick™ ® quality.
 

SEE APPLICATION AND WARNING INFORMATION

Para Español: www. thecrosbygroup.com On Pages 332-339
 

OPTIONS AVAILABLE

  • Bronze Bushed Sheaves
  • Duplex Hooks
  • Swivel Tee and Shackle Assemblies
  • Sheave Shrouds
  • Anti Rotation - Locking Device (75 tons & larger).
  • Plate Steel Cheek Weights
  • Third party testing with Certification available upon request.

Dead End Chart
(Double, Triple, & Quad Sheave Blocks*)

 Wire Rope Size
( in.)
Dimensions
( in.)
 T
Thickness
U
Hole Diameter
McKissick
US-422/US-422T Utility Socket
Stock No. Size
 7/16 1.00 1.28 1044309+ US4 7/16
1/2 1.00 1.28 1044318+ US4 1/2
9/16 1.00 1.28 1044336+ US5 9/16
5/8 1.00 1.28 1044345+ US5 5/8
3/4 1.25 1.66 1044363+ US6 3/4
7/8 1.25 1.66 1038580   US7 7/8
1 1.25 1.66 1044417+ US8 1
1-1/8 1.75 2.56 1044426+ US10 1-1/8
1-1/4 1.75 2.56 1044435+ US10 1-1/4

* To find Dead End Dimensions for Single Sheave blocks, refer to tables on pages 267.
+US-422T Terminator Style