Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number NKI 12 15 found under Bearing Roller Need by Ina Bearing Co Inc. The National Stock Number assigned to this part is 3110013211503, and the Federal Supply Class is 3110 Bearings Antifriction Unmounted. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like NKI 12 15.