4140 Alloy Steel High-Pressure Coupling Sleeve 3-inch
Heavy-duty threaded sleeve from 4140 chrome-moly alloy steel for 3-inch high-pressure hydraulic lines in mining equipment. HTS 7307.92.3030 applies to these non-stainless alloy threaded couplings, offering superior tensile strength for demanding industrial connections.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If supplied as unfinished tubes
Incomplete sleeves resembling alloy steel tubes rather than finished fittings go under Chapter 73 tubes/pipes.
If with integrated valve mechanism
Sleeves incorporating valves or regulators become appliance parts under 8481, not plain pipe fittings.
If of carbon steel, not alloy
Non-alloy (plain carbon) steel threaded sleeves use 7307.92.3020, based on material alloying elements.
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Import Tips & Compliance
• Chemical analysis report required to prove 4140 alloy (Cr 0.8-1.1%, Mo 0.15-0.25%) and non-stainless status
• Specify application (e.g
• hydraulic) but avoid end-use claims that could trigger reclassification
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