McKissick M-491S Derrick Hoist Block - 1 in - 15 Ton - 16 in - Roll-Forged

Description du produit

The McKissick M-491S Derrick Hoist Block is a heavy-duty single-sheave hoist block engineered for derrick and overhead lifting applications requiring reliable, high-cycle performance in oilfield, construction, and industrial environments. Rated for a 15-ton working load limit, this block is built around a 16-inch outside diameter roll forged sheave supported by a sealed tapered roller bearing, providing high radial and axial load capacity with integrated contamination protection and superior sheave durability for extended service life under demanding field conditions. The M-491S series in this configuration accommodates wire rope cable up to 1 inch in diameter.

The roll forged sheave construction delivers superior strength and fatigue resistance compared to cast sheave alternatives, making this configuration of the M-491S well suited for high-cycle derrick hoist operations and applications subject to shock loading or sustained tension in demanding oilfield and construction environments. The sealed tapered roller bearing delivers superior load capacity and precise sheave alignment under combined radial and axial loads, while the integrated seal protects the bearing from contamination by dirt, dust, moisture, and debris, reducing maintenance requirements and extending operational life in harsh field environments where routine servicing may be limited. The 16-inch sheave diameter provides a generous rope bend radius for the 1-inch wire rope accommodated by this block, supporting rope longevity during high-cycle hoist operations.

The M-491S in this 15-ton, 1-inch rope capacity configuration with roll forged sheave represents a higher-capacity and more robust variant within the M-491S derrick hoist block line, combining the sealed tapered roller bearing protection of the series with roll forged sheave durability for the most demanding derrick hoist applications. This block is well suited for use in oilfield derrick systems, construction gin poles, and industrial overhead lifting applications requiring a high-performance hoist block with sealed bearing protection, roll forged sheave strength, and a 15-ton working load capacity.

Material:

Steel (body and side plates) Roll forged steel sheave Sealed tapered roller bearing

Compatible With:

Wire rope cable up to 1 in diameter

Uses:

Traveling or fixed block in derrick and gin pole rigging systems Overhead lifting in oilfield and construction environments High-cycle hoist operations requiring sealed bearing protection and roll forged sheave durability Industrial overhead load handling

Key Features:

15 Ton working load limit 16 in sheave outside diameter Roll forged sheave for superior strength and fatigue resistance Sealed tapered roller bearing for high load capacity and contamination protection Accommodates wire rope cable up to 1 in diameter Generous sheave diameter for improved rope bend radius and extended rope service life Sealed bearing reduces maintenance requirements in harsh field conditions McKissick M-491S series