Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number S130U1 21D found under Retainer Electron T by Interplex Nascal Inc. The National Stock Number assigned to this part is 5960009134660, 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 S130U1 21D.