Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 340412-B21 found under Cable Assembly Set Fiber Optic by Compaq Computer Corp. The National Stock Number assigned to this part is 6080015002970, and the Federal Supply Class is 6080 Fiber Optic Kits And Sets. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 340412-B21.