Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number Z175B28EX1A found under Bearing Sleeve by Ingersoll Rand Corp. The National Stock Number assigned to this part is 3120001273963, 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 Z175B28EX1A.