Crown Block Sheave Assembly
Multi-groove sheave assembly for crown block at top of oil rig derrick (8428). Guides wireline for hoisting operations. Oil/gas exclusive for 8431.39.0050.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If crane pulley blocks
Hoisting crane parts in 8431.10 if not rig crown-specific.
If generic pulleys/sheaves
Transmission shafts/pulleys in 8483 without oilfield context.
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Import Tips & Compliance
• Bearing load ratings for wire rope size; non-destructive testing reports
• Avoid crane pulley classification
Related Products under HTS 8431.39.00.50
Mud Pump Piston Assembly
Replacement piston assembly designed specifically for mud pumps used in oil and gas drilling rigs under heading 8428. It handles high-pressure abrasive drilling fluids to circulate mud during borehole excavation. Classified under 8431.39.0050 as a part solely for oil and gas field machinery of 8428.
Rotary Drilling Swivel
Swivel mechanism connecting the rotary hose to the drilling kelly on oil and gas rigs, allowing rotation while transmitting mud flow (heading 8428). It supports the drill string weight and enables continuous drilling operations. Fits 8431.39.0050 as exclusive part for oilfield machinery.
Kelly Drive Bushing
Wear-resistant bushing for the kelly drive system in rotary oil drilling rigs (8428), transmitting torque from turntable to drill pipe. Made from hardened steel for harsh downhole conditions. Principal use qualifies it for 8431.39.0050 oil/gas parts.
Drawworks Brake Drum
Heavy-duty brake drum for drawworks hoisting system on oil and gas drilling rigs (8428), controlling drill string movement. Engineered for high-torque stopping in extreme environments. Classified in 8431.39.0050 for oilfield-specific parts.
Top Drive Gearbox Housing
Cast housing for gearbox in top drive drilling systems used on oil/gas rigs (8428), housing gears for rotating drill string. Designed for high-pressure, corrosive environments. Exclusive to oilfield qualifies for 8431.39.0050.
Blowout Preventer Accumulator Rack
Mounting rack for hydraulic accumulators in blowout preventer (BOP) stacks on oil/gas wells (8428 machinery). Ensures emergency pressure for well control. Fits 8431.39.0050 as dedicated oilfield safety part.