Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 0405NI 2.50IN ITEM 7 found under O Ring by Fairbanks Inc. The National Stock Number assigned to this part is 5331013980763, 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 0405NI 2.50IN ITEM 7.