The B90 was an American thermonuclear bomb designed in the mid to late 1980s and cancelled prior to introduction into military service.
The B90 design was intended for use as a naval aircraft weapon, for use as a nuclear depth bomb and as a land attack strike bomb. It was intended to replace the B57 nuclear bomb used by the Navy. The B90 bomb design entered Phase 3 development engineering and was assigned its numerical designation in June 1988.
The B90 was 13.3 inches in diameter and 118 inches long, and weighed 780 pounds. The B90 had a design yield of 200 kilotons.
The B90 was cancelled in September 1991 along with the W89 and W91 nuclear warheads and AGM-131 SRAM II and SRAM-T missile models. No B90 production models were built, though test units may have been; US nuclear weapon testing continued until 1992.