Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 7520-00-240-5503 found under Clipboard File by National Industries For The Blind. The National Stock Number assigned to this part is 7520002405503, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 7520-00-240-5503.