McKissick M-491S Derrick Hoist Block - 1/2 to 9/16 in - 12 Ton - 10 in

Description du produit

The McKissick M-491S Derrick Hoist Block is a purpose-built hoisting block designed for derrick and oilfield service applications requiring a 12 Ton working load capacity. Engineered to accommodate wire rope ranging from 1/2 to 9/16 inch in diameter, this block features a 10-inch outside diameter sheave that provides a suitable rope bend radius for the wire rope sizes used in medium-duty derrick hoisting and service operations. The M-491S series reflects McKissick's established expertise in producing reliable oilfield and derrick rigging components built to perform under the continuous duty cycles and variable load conditions common to drilling and well service environments.

The block is fitted with sealed tapered roller bearings, combining the load-handling advantages of tapered roller bearing geometry with integrated seals that protect the bearing assembly from contamination by drilling fluids, mud, dust, and other field debris. Tapered roller bearings efficiently manage both the radial loads from the hoisting line and the axial forces introduced by fleet angle and block swing, while the sealed configuration reduces maintenance requirements and supports reliable performance in remote field locations. The M-491S designation distinguishes this block from the lighter-duty M-491G variant, reflecting its higher 12 Ton working load capacity and compatibility with the larger 1/2 to 9/16 inch wire rope diameter range used in medium-duty derrick service applications.

The McKissick M-491S is appropriate for use in derrick hoisting systems, gin pole operations, workover and well service rigs, and other oilfield applications where a reliable 12 Ton hoist block with sealed bearing protection is required. Its design supports use with wire rope in the 1/2 to 9/16 inch diameter range, making it compatible with the line sizes commonly employed in medium-duty derrick and service rig hoisting configurations. Always confirm working load limits, wire rope diameter, and hook or attachment compatibility before placing the block into service.

Material:

Sealed Tapered Roller Bearings

Compatible With:

Wire Rope 1/2 to 9/16 in Diameter

Uses:

Derrick Hoisting Operations Oilfield Well Service and Workover Rig Applications Gin Pole Hoisting Systems Medium-Duty Oilfield Rigging Service Rig Block and Tackle Configurations

Key Features:

12 Ton Capacity 1/2 to 9/16 in Wire Rope Diameter Range 10 in Sheave Outside Diameter Sealed Tapered Roller Bearings for Contamination Protection and Reduced Maintenance Purpose-Built for Derrick and Oilfield Service Applications McKissick M-491S Series Derrick Hoist Block Design Higher Capacity Variant vs. M-491G for Medium-Duty Derrick Hoisting Suitable for Continuous Duty Oilfield Hoisting Cycles