Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 816549-091 found under Bearing Front by Armstrong Pumps Inc. The National Stock Number assigned to this part is 3110003946101, 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 816549-091.