Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number PI2556 found under Spacer Sleeve by Osgood Co The. The National Stock Number assigned to this part is 5365003607325, 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 PI2556.