McKissick M-491G Derrick Hoist Block - 3/8 to 1/2 in - 8 Ton - 10 in

Product Description

The McKissick M-491G Derrick Hoist Block is a purpose-built hoisting block designed for derrick and oilfield service applications requiring an 8 Ton working load capacity. Engineered to accommodate wire rope ranging from 3/8 to 1/2 inch in diameter, this block features a 10-inch outside diameter sheave that provides a suitable bend radius for the wire rope sizes used in light to medium derrick hoisting and service operations. The M-491G series reflects McKissick's long-standing 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. This bearing arrangement is well suited to the demanding and often continuous operating conditions of derrick service work.

The McKissick M-491G is appropriate for use in derrick hoisting systems, gin pole operations, workover and well service rigs, and other oilfield applications where a compact, reliable 8 Ton hoist block with sealed bearing protection is required. Its design supports use with standard wire rope in the 3/8 to 1/2 inch diameter range, making it compatible with the line sizes commonly employed in light 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 3/8 to 1/2 in Diameter

Uses:

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

Key Features:

8 Ton Capacity 3/8 to 1/2 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-491G Series Derrick Hoist Block Design Suitable for Continuous Duty Oilfield Hoisting Cycles