Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number HL552-5-10 found under Bearing Unit by Alcoa Fastening Systems Ltd. The National Stock Number assigned to this part is 3130008392140, 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 HL552-5-10.