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SITCSection 7
U.S. exports of variable electrical resistors, not elsewhere specified (rheostats & potentiometers) (SITC 77235) totaled $49.2M in July 2026.
Importers of Variable Electrical Resistors, Not Elsewhere Specified (Rheostats & Potentiometers) paid $3.9M in duties in July 2026 — an effective duty rate of 17% on $23.0M in dutiable value, based on actual customs collections rather than the published tariff schedule.
Basic heading 271 of 642 in section 7
Basic heading 77235 · $36.1M of $175.6B
Non-wirewound variable resistors — including carbon-track, conductive-plastic, and cermet potentiometers, as well as trimmer potentiometers used for circuit calibration — occupy this residual NES heading. Conductive-plastic types dominate in applications demanding long rotational life and low noise, such as precision servo systems and medical instrumentation, while cermet trimmers are ubiquitous on PCBs for one-time calibration adjustments. The NES designation means the heading is a catch-all, so the corresponding HTS classification requires careful review of the resistive element material and mechanical configuration. Section 301 tariffs on Chinese-origin electronic components affect a broad range of these products.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
3.7K shipments/mo
Both fall under this NES variable resistor heading, but the resistive element material — cermet (a ceramic-metal composite) versus conductive plastic — affects the product's performance profile and may influence the specific HTS 10-digit line. Cermet trimmers are typically single-turn, panel-mount or PCB-mount calibration devices, while conductive-plastic types are used in continuous-rotation, high-cycle applications. Invoices and datasheets should specify the element type.
Digital potentiometers — integrated circuits that simulate a variable resistor under digital control — are generally classified as integrated circuits rather than as variable resistors, and would not fall under this SITC heading. Only mechanically adjustable variable resistors with non-wirewound elements belong here. Importers of digitally controlled resistance devices should verify their HTS classification separately.
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Exports · July 2026
destination
Mexico and Canada together take 67% of it.
customs district
Census does not publish district detail for this classification system.
origin
Census does not publish state detail for this classification system.
entry
Census does not publish port detail for this classification system.
ImportsExports
Imports
$36.1MYoY · Pro
Exports
$49.2MYoY · Pro
12-mo low · imports
YoY · ProThrough July 2026. Source: U.S. Census Bureau.