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Derrick/Tower Blocks
The M-491 Derrick/Tower Block was designed in cooperation with oilfield & tower contractors. It boasts a new design that provides the dependability of standard McKissick snatch blocks, along with features that make it perfect for the challenging need of Tower and Tugger Hoist applications.


  • All blocks 14" and larger are furnished with McKissick Roll-Forged sheaves with flame hardened grooves.

  • Suitable for hoisting presonnel -contingent upon all employees, including the winch operator, being trained to follow any applicable federal, local and industry standards.

  • Sealed tapered roller bearings that extend bearing life and allow for faster line speeds than recommended with standard snatch blocks.

  • Forged steel swivels, tees, yokes and shackles are Quenched & Tempered.

  • Shackle fitting swivels for easy positioning.

  • Sheave lubrication through center pin for easy maintance.

  • Lower bolt provides connection when used as foot block.

  • A wide variety of configurations.

  • Manufactured by an API QI Certified Facility.

  • Design factor of 4 to 1.

  • Part NoProduct NameU/MFinishSheave DiamWire Rope SizeWLL (tn)Wt (lb)
    225490M-491 DERRICK/TOWER BLOCK 4TEAPainted, HG8 in3/8-1/2 in435
    225500M-491 DERRICK/TOWER BLOCK 8TEAPainted, HG10 in3/8-1/2 in855
    225510M-491 DERRICK/TOWER BLOCK 8T1EAPainted, HG10 in1/2-9/16 in855
    225520M-491 DERRICK/TOWER BLOCK 12TEAPainted, HG10 in1/2-9/16 in1255
    225530M-491 DERRICK/TOWER BLOCK 12T1EAPainted, HG14 in5/8 in1295
    225540M-491 DERRICK/TOWER BLOCK 12T2EAPainted, HG14 in3/4 in1295
    225550M-491 DERRICK/TOWER BLOCK 15TEAPainted, HG16 in7/8 in15150
    225560M-491 DERRICK/TOWER BLOCK 15T1EAPainted, HG16 in1 in15150
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