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M-491 Tower / Derrick Hoist Blocks




M-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 or 15 metric ton capacity
  • 10mm to 25mm wire line sizes
  • Painted or Galvanized finish
  • 203mm and 254mm 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 356mm and larger are furnished with McKissick® Roll Forged™ 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

Working
Load Limit
(t)*
Sheave
Diameter
(mm)
Wire Rope
Size
(mm)
M-491S
Stock No.
Painted
M-491G
Stock No.
Galvanized
Weight
Each
(kg.)
4 203 10 - 13 2020161 2020170 16
8 254 10 - 13 2020806 2020815 25
8 254 13 - 14 2020824 2020833 25
12 254 13 - 14 2021118 2021127 25
12 356 16 2021136 2021145 43
12 356 19 2021154 2021163 43
15 406 22 2021172 2021181 68
15 406 25 2021190 2021199 48
* Ultimate Load is 4 times the Working Load Limit
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