Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 91-98006-021 found under Clamp Loop by Tracor Flight Systems Inc. The National Stock Number assigned to this part is 5340005306493, and the Federal Supply Class is 5340 Hardware Commercial. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 91-98006-021.