Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number S1620-61883-3 found under Washer Flat by Rotair Industries Inc. The National Stock Number assigned to this part is 5310000044053, and the Federal Supply Class is 5310 Nuts And Washers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like S1620-61883-3.