| 44214 | Unit head machines, way-type | |
| 73124 | Units, central processing, rental or leasing of, without operator | |
| 73124 | Units, peripheral, rental or leasing of, without operator | |
| 46111 | Units, self-synchronizing, direct current, of an output exceeding 37.5 W | |
| 46111 | Universal AC/DC motors of an output not exceeding 37.5 W | |
| 42190 | Universal plates, of iron or steel, prepared for use in structures | |
| 92390 | Universities, education services provided by | |
| 54129 | Universities, general construction of | |
| 92390 | University and other higher education services | |
| 63220 | University dining halls, services of | |
| 61113 | Unmanufactured tobacco, wholesale trade services of, except on a fee or contract basis | |
| 61213 | Unmanufactured tobacco, wholesale trade services of, on a fee or contract basis | |
| 44611 | Unreeling machines for silkworm cocoons | |
| 39920 | Unstabilised sludge | |
| 97130 | Upholstery fabric, cleaning of | |
| 29600 | Upper assemblies, footwear, fixed to inner soles, without outer soles | |
| 29600 | Uppers, footwear (excl. of asbestos) | |
| 33610 | Uranates containing natural uranium | |
| 33630 | Uranates containing uranium depleted in U 235 | |
| 33620 | Uranates containing uranium enriched in U 235 | |
| 13000 | Uraninite | |
| 33630 | Uranium alloys (uranium depleted in U 235 predominating), malleable, wrought or unwrought (excl. alloys containing a radioactive constituent of 2% or more by weight of a precious metal) | |
| 33630 | Uranium alloys (uranium enriched in U 238 predominating), malleable, wrought or unwrought (excl. alloys containing a radioactive constituent of 2% or more by weight of a precious metal) | |
| 33610 | Uranium alloys containing natural uranium | |
| 33620 | Uranium alloys containing uranium enriched in U 235 | |
| 33610 | Uranium carbides containing natural uranium, whether or not dispersed in graphite or polyethylene | |
| 33630 | Uranium carbides containing uranium depleted in U 235 | |
| 33620 | Uranium carbides containing uranium enriched in U 235 | |
| 33630 | Uranium compounds (inorganic or organic) containing uranium depleted in U 235 | |
| 33630 | Uranium depleted in U 235, wrought or unwrought | |
| 33620 | Uranium enriched in U 235, and its compounds | |
| 33630 | Uranium enriched in U 238, wrought or unwrought | |
| 33610 | Uranium fluorides containing natural uranium | |
| 33630 | Uranium fluorides containing uranium depleted in U 235 | |
| 33620 | Uranium fluorides containing uranium enriched in U 235 | |
| 33610 | Uranium hexafluoride containing natural uranium | |
| 33630 | Uranium hexafluoride containing uranium depleted in U 235 | |
| 44917 | Uranium isotope separators | |
| 33620 | Uranium isotopes 233 and 235, and their inorganic or organic compounds | |
| 33610 | Uranium oxides containing natural uranium | |