Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 012 1005 21 found under Bearing Unit Plain by Kato Engineering Inc. The National Stock Number assigned to this part is 3130016646090, and the Federal Supply Class is 3130 Bearings Mounted. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 012 1005 21.