Kelly Drive Bushing
Precision-machined bushing that engages the square kelly bar in offshore platform rotary tables, transmitting torque to the drill string (HTS 8431.43.40.00). Made from hardened alloy steel for 8430.41/8430.49 boring machinery in marine environments. Core rotary drive component for offshore drilling.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If parts of onshore boring machinery
Onshore drilling rotary parts use other 8431.43 provisions; offshore platform-specific bushings are .40.
If as general metalworking bushings
Precision bushings/bearings default to 8466 if not established as principal parts of offshore drilling rotary systems.
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Import Tips & Compliance
• Exact kelly dimension tolerance (±0.001") must match platform specs; provide Rockwell hardness certs; document as replacement part not complete rotary table
Related Products under HTS 8431.43.40.00
BOP Stack Assembly for Offshore Platforms
A blowout preventer (BOP) stack assembly is a critical safety component designed specifically for offshore oil and natural gas drilling platforms under HTS 8431.43.40.00. It consists of multiple ram and annular preventers mounted on a manifold to seal the wellbore during drilling operations on floating or fixed platforms. Classified here as a part solely for boring machinery of subheading 8430.41 or 8430.49 used offshore.
Offshore Drilling Riser Joint
A marine riser joint connects sections of the riser string used in offshore drilling platforms to convey drilling fluid and guide tools between the rig and subsea wellhead (HTS 8431.43.40.00). These high-pressure, corrosion-resistant pipes are engineered for deepwater environments on platforms using 8430.41/8430.49 boring machinery. Essential for maintaining well control during offshore operations.
Subsea Wellhead Connector
A high-pressure subsea wellhead connector mates the offshore platform's blowout preventer stack to the subsea wellhead in oil and gas drilling operations (HTS 8431.43.40.00). Designed for extreme deepwater pressures and remote operation via ROVs on 8430.41/8430.49 platforms. Classified as a principal part for offshore boring machinery.
Offshore Derrick Crown Block
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Platform Tensioner Cylinder Assembly
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Top Drive Gearbox Module
The gearbox module within an offshore top drive system transmits power to rotate the drill string on oil/gas platforms (HTS 8431.43.40.00). Designed for harsh marine environments and high-torque requirements of 8430.41/8430.49 boring rigs. A key power transmission part solely for offshore drilling.