Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B5853S found under Electron Tube by Unisys Corporation. The National Stock Number assigned to this part is 5960000034624, and the Federal Supply Class is 5960 Electron Tubes And Associated Hardware. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like B5853S.