Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 3555 found under Spacer Sleeve by Pratt And Whitney Canada Inc Whi. The National Stock Number assigned to this part is 5365005249063, 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 3555.