Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 523X012 found under Tank Fuel Engine by Stewart And Stevenson Power Products. The National Stock Number assigned to this part is 2910002250154, and the Federal Supply Class is 2910 Engine Fuel System Components Nonaircraft. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 523X012.