Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 255001-28 found under Shim by Aar Parts Trading Inc. The National Stock Number assigned to this part is 5365007772826, 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 255001-28.