Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 5400-2 found under Ring Connecting Round by Bosworth Company The. The National Stock Number assigned to this part is 5365012278650, 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 5400-2.