Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number IR01-8639-88A found under Bushing Sleeve by Ingersoll Rand Corp. The National Stock Number assigned to this part is 3120001263366, and the Federal Supply Class is 3120 Bearings Plain Unmounted. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like IR01-8639-88A.