Seamless steel containers not overwrapped, marked DOT 3A, 3AX, 3AA, 3AAX, 3B, 3E, 3HT, 3T or DOT-E followed by a specific exemption number
Containers for compressed or liquefied gas, of iron or steel > Certified prior to exportation to have been made in accordance with the safety requirements of sections 178.36 through 178.68 of title 49 CFR or under a specific exemption to those requirements: > Seamless steel containers not overwrapped, marked DOT 3A, 3AX, 3AA, 3AAX, 3B, 3E, 3HT, 3T or DOT-E followed by a specific exemption number
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 9903.88.13, 9903.88.18, 9903.88.33, 9903.88.34, 9903.88.35, 9903.88.36, 9903.88.37, 9903.88.38, 9903.88.40, 9903.88.41, 9903.88.43, 9903.88.45, 9903.88.46, 9903.88.48, 9903.88.56, 9903.88.64, 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(e) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(f)
Products classified under HTS 7311.00.00.30
DOT 3A Seamless Steel Gas Cylinder
A seamless steel cylinder certified under DOT 3A specifications for compressed gases, marked accordingly and not overwrapped. It complies with 49 CFR 178.36 safety requirements for high-pressure gas storage and transport. Used for industrial gases like oxygen or nitrogen.
DOT 3AA Seamless Steel Oxygen Cylinder
High-strength seamless steel cylinder marked DOT 3AA for medical or industrial oxygen storage, not overwrapped. Meets DOT safety standards under 49 CFR for pressures up to 1800 psi. Essential for welding, healthcare, and diving applications.
DOT 3B Seamless Steel Helium Balloon Cylinder
Seamless steel cylinder marked DOT 3B for helium party balloons or blimps, without overwrap. Complies with 49 CFR safety for lighter-than-air gas containment. Portable size for event use.
DOT 3E Small Steel Paintball Tank
Compact seamless steel tank marked DOT 3E for paintball markers, not overwrapped. Meets DOT specs for 3000 psi compressed air. Lightweight for sports and recreational use.
DOT 3HT Hydrogen Fuel Cylinder
Heat-treated seamless steel cylinder marked DOT 3HT for hydrogen fuel cells or storage, no overwrap. Designed for ultra-high pressures per 49 CFR. Used in automotive and energy applications.
DOT 3T Thick-Wall Steel Gas Bottle
Thick-walled seamless steel bottle marked DOT 3T for specialty compressed gases, unwrapped. High-strength per CFR for corrosive or reactive gases. Industrial lab use.
DOT-E Exempt Seamless Steel Cylinder
Seamless steel cylinder under specific DOT-E exemption, marked with exemption number, not overwrapped. Custom certified for unique gas applications per 49 CFR. For experimental or prototype uses.
DOT 3AA Nitrogen Charge Cylinder
Seamless steel cylinder marked DOT 3AA for nitrogen charging in hydraulic accumulators, no overwrap. Standard for automotive and machinery pre-charge. 300 cubic foot capacity.
DOT 3B Carbon Dioxide Fire Extinguisher Cylinder
Seamless steel cylinder marked DOT 3B for CO2 fire extinguishers, unwrapped. Base container certified before valve attachment. 20 lb water capacity.
DOT 3AX High-Pressure Air Tank
Seamless steel tank marked DOT 3AX for compressed air in PCP airguns or tools, no overwrap. Extreme pressure rating for 4500 psi. Sports and pneumatic use.
DOT 3AAX Medical Nitrous Oxide Cylinder
Seamless steel cylinder marked DOT 3AAX for medical nitrous oxide (laughing gas), unwrapped. Certified for healthcare delivery systems. 60 lb capacity.
DOT 3E Calibration Gas Bottle
Small seamless steel bottle marked DOT 3E for gas analyzer calibration mixtures, no overwrap. Lab-grade per CFR. Reactive gas compatible.
DOT 3T Cryogenic Gas Cylinder
Seamless thick-wall steel cylinder marked DOT 3T for cryogenic compressed gases like liquid nitrogen precursors, unwrapped. Specialized alloy construction.
DOT 3AX Steel Diving Tank
Seamless steel high-pressure tank marked DOT 3AX for scuba diving air storage, without overwrap. Certified per 49 CFR 178 for extreme pressure resistance in recreational and professional diving. Typically 80 cubic feet capacity.
DOT 3AAX Argon Welding Cylinder
Extra-high-pressure seamless steel cylinder marked DOT 3AAX for shielding gases like argon in MIG/TIG welding, not overwrapped. Adheres to DOT exemption or CFR standards for industrial fabrication. Capacity for 250+ cubic feet.