Mechanical seals
Gaskets and similar joints of metal sheeting combined with other material or of two or more layers of metal; sets or assortments of gaskets and similar joints, dissimilar in composition, put up in pouches, envelopes or similar packings; mechanical seals: > Mechanical seals
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 8484.20.00.00
Gallium Arsenide Wafer Polisher Seal
Mechanical seal for chemical mechanical polishing (CMP) of GaAs compound semiconductor wafers. Classified HTS 8484.20.00.00 under semiconductor statistical notes for wafer preparation equipment. Uses alkaline slurries for mirror finish.
Single Spring Mechanical Face Seal
A mechanical seal featuring a single spring mechanism to maintain contact between rotating and stationary sealing faces, commonly used in industrial pumps. It falls under HTS 8484.20.00.00 as a mechanical seal designed for dynamic sealing applications in rotating equipment. These seals prevent leakage of fluids under pressure by balancing axial forces.
Cartridge Type Mechanical Seal
Pre-assembled cartridge mechanical seal that installs as a single unit onto pump shafts, simplifying maintenance in chemical processing equipment. Classified under HTS 8484.20.00.00 for its mechanical sealing action using multiple sealing elements. Ideal for high-pressure applications requiring easy replacement.
Bellows Mechanical Seal
Metal or elastomeric bellows mechanical seal providing axial movement for sealing in agitators and mixers. Under HTS 8484.20.00.00 as it uses mechanical faces with bellows for pressure compensation. Suited for corrosive environments in pharmaceutical production.
Double Mechanical Seal Arrangement
Tandem or back-to-back double mechanical seals with barrier fluid provisions for hazardous fluid handling in petrochemical pumps. HTS 8484.20.00.00 covers these as mechanical seals despite dual faces. Provides redundancy for safety-critical applications.
Pusher Type Mechanical Shaft Seal
Spring-loaded pusher mechanical seal where sealing faces slide axially along the shaft in water pumps. Classified HTS 8484.20.00.00 for mechanical sealing mechanism. Common in HVAC and general water circulation systems.
Stationary Seat Mechanical Seal
Mechanical seal with stationary seat design where only the rotating face moves, used in high-speed turbines. HTS 8484.20.00.00 as mechanical seal variant. Reduces wear in continuous duty applications.
Split Axial Mechanical Seal
Clamshell split mechanical seal for in-situ installation on large slurry pumps without shaft removal. Under HTS 8484.20.00.00 for mechanical sealing in abrasive services. Used in mining and dredging operations.
High Temperature Mechanical Seal
Mechanical seal with graphite secondary seals for temperatures exceeding 400°C in furnace circulator pumps. HTS 8484.20.00.00 covers specialized mechanical seals. Critical for heat transfer fluid systems.
API 682 Compliant Mechanical Seal
Pressurized dual mechanical seal meeting API 682 standards for refinery pump applications. Classified HTS 8484.20.00.00 as mechanical seal. Ensures emission control in volatile service.
Cryogenic Service Mechanical Seal
Mechanical seal with perfluoroelastomer seals for LNG pump applications at -160°C. HTS 8484.20.00.00 for extreme condition mechanical seals. Prevents boil-off in cryogenic fluids.
Wafer Grinder Spindle Mechanical Seal
Precision mechanical seal for semiconductor wafer grinder spindles, preventing slurry contamination. Falls under HTS 8484.20.00.00 as mechanical seal, with statistical note recognition for semiconductor processing. Maintains flatness during crystal grinding.
Crystal Puller Rotary Mechanical Seal
Mechanical seal for Czochralski crystal puller rotation mechanisms in silicon boule production. HTS 8484.20.00.00 per statistical notes for semiconductor crystal growers. Withstands high vacuum and temperature cycles.
Wafer Slicing Saw Coolant Mechanical Seal
Mechanical seal containing diamond slurry coolant in wire saws slicing semiconductor wafers from boules. Under HTS 8484.20.00.00 statistical provisions for wafer preparation equipment. Ensures precise kerf-less slicing.
Silicon Wafer Lapper Mechanical Seal
Mechanical seal for lapping machine platens processing silicon wafers to exact thickness tolerances. HTS 8484.20.00.00 for semiconductor wafer preparation per statistical notes. Critical for surface flatness before polishing.