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
|