Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 21-0001-8 found under Semiconductor Devic by Ward Leonard Electric Company Inc. The National Stock Number assigned to this part is 5961010278750, and the Federal Supply Class is 5961 Semiconductor Devices And Associated Hardware. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 21-0001-8.