Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 5544-618 found under Gage Ring Plain by Fatigue Technology International. The National Stock Number assigned to this part is 5220016150503, and the Federal Supply Class is 5220 Inspection Gages And Precision Layout Tools. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 5544-618.