Constantan Nickel-Copper Wire
Constantan (55% copper, 45% nickel) wire provides stable electrical resistance for precision thermocouples and strain gauges. Though copper-rich, nickel alloy status and non-cold-formed processing classify it under HTS 7505.22.50.00.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If declared primarily as copper alloy
Customs may prefer copper Chapter 74 if copper declared as base metal.
If when pre-assembled into thermocouples
Complete thermocouple assemblies classify as thermometers under Chapter 90.
If fabricated into strain gauge elements
Measuring instruments containing the wire classify under Chapter 90.
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Import Tips & Compliance
• Thermocouple type (Type J, T) designation helps verify alloy composition
• Provide resistivity curves confirming constantan properties vs generic alloys
• Copper content can trigger secondary review for Chapter 74 classification
Related Products under HTS 7505.22.50.00
Monel 400 Nickel-Copper Alloy Wire
Monel 400 wire, a nickel-copper alloy, offers excellent resistance to seawater and acidic environments, commonly used in marine hardware and valves. Not cold-formed, this wire is hot-processed and falls under HTS 7505.22.50.00 for non-cold-formed nickel alloy wire products.
Alloy 20Cb-3 Nickel-Iron-Chromium Wire
Alloy 20Cb-3 (Carpenter 20) wire resists sulfuric acid and chloride stress corrosion, used in pharmaceutical and food processing equipment. Not cold-formed production places it under HTS 7505.22.50.00 for nickel alloy wire.
Nimonic 75 Nickel-Chromium Wire
Nimonic 75 wire serves gas turbine and furnace applications requiring oxidation resistance up to 1000°C. This not cold-formed nickel-chromium alloy wire falls under HTS 7505.22.50.00 classification.
Rene 41 Nickel-Based Superalloy Wire
Rene 41 superalloy wire for turbine blades and hot-section components offers exceptional creep resistance above 1800°F. Not cold-formed condition classifies under HTS 7505.22.50.00 as nickel alloy wire.
Ni-Span C Nickel-Iron Alloy Wire
Ni-Span C wire maintains constant modulus over wide temperature range, essential for precision springs in watches and instruments. The not cold-formed nickel alloy wire is classified under HTS 7505.22.50.00.
Inconel 625 Nickel Alloy Wire
Inconel 625 is a high-performance nickel-chromium-molybdenum alloy wire used in aerospace and chemical processing for its corrosion resistance and strength at high temperatures. This wire is not cold-formed, produced via hot drawing or extrusion processes, and classified under HTS 7505.22.50.00 as nickel alloy wire in its non-cold-formed state.