Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 491749 found under Ring by American Tubular Elevator Co. The National Stock Number assigned to this part is 5365011673972, and the Federal Supply Class is 5365 Bushings Rings Shims And Spacers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 491749.