Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 993-9018-9 found under Ring by Efdyn Incorporated. The National Stock Number assigned to this part is 5365012669257, 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 993-9018-9.