Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 21K147 found under by Union Gear And Sprocket Corp. The National Stock Number assigned to this part is 5961012965104, 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 21K147.