Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 21-00073 found under Capacitor Fixed Electrolytic by Signal Design Inc. The National Stock Number assigned to this part is 5910012457718, and the Federal Supply Class is 5910 Capacitors. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 21-00073.