Of oil and gas field machinery
Parts suitable for use solely or principally with the machinery of headings 8425 to 8430: > Of machinery of heading 8428: > Other > Other: > Of oil and gas field machinery
Duty Rate (from China)
Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter
Except as provided in headings 9903.88.05, 9903.88.06, 9903.88.07, 9903.88.08, 9903.88.10, 9903.88.11, 9903.88.14, 9903.88.19, 9903.88.50, 9903.88.52, 9903.88.58, 9903.88.60, 9903.88.62, 9903.88.66, 9903.88.67, 9903.88.68, or 9903.88.69, articles the product of China, as provided for in U.S. note 20(a) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(b) [to this subchapter]
Products classified 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.
Drill Pipe Slip Insert
Hardened steel inserts for drill pipe slips in rotary tables of oil rigs (8428), gripping pipe during drilling. Tungsten carbide tipped for wear resistance. Principal oilfield use under 8431.39.0050.
Christmas Tree Valve Actuator
Hydraulic actuator for gate valves on oil/gas wellhead Christmas trees (8428 classified machinery). Controls flow from production wells. Dedicated oilfield part for 8431.39.0050.
Oil Rig Mast Section
Prefabricated steel section for derrick/mast on land oil drilling rigs (8428). Supports crown block and traveling equipment. Structural part exclusive to oilfield under 8431.39.0050.
Frac Pump Fluid End
High-pressure fluid end assembly for hydraulic fracturing pumps in oil/gas well stimulation (8428). Handles proppant slurries at extreme pressures. Oilfield-specific part in 8431.39.0050.
Wellhead Pressure Gauge Manifold
Manifold block integrating pressure gauges for oil/gas wellhead monitoring (8428 systems). Distributes hydraulic signals safely. Principal use in oilfield for 8431.39.0050.
Drilling Jar Sub
Threaded sub-connector for hydraulic/mechanical drilling jars stuck in oil well boreholes (8428 rig tools). Delivers jarring impact to free pipe. Dedicated oilfield part under 8431.39.0050.
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.
Oilfield Cementing Head
Cementing head manifold for pumping cement plugs into oil/gas well casings during completion (8428). Releases darts/plugs for zonal isolation. Specialized for 8431.39.0050.
Wireline Stuffing Box
Sealing stuffing box for wireline operations on oil/gas wells (8428), packing off around cable under pressure. Prevents well fluid escape during logging. Oilfield part under 8431.39.0050.