Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number AN-2.5-125F-SS-F ITEM 5 found under O Ring by Core Industries Inc. The National Stock Number assigned to this part is 5331013827580, 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 AN-2.5-125F-SS-F ITEM 5.