Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number RB12057-1 found under Shroud Impeller by Crane Company. The National Stock Number assigned to this part is 2915008774070, and the Federal Supply Class is 2915 Engine Fuel System Components Aircraft And Missile Prime Movers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like RB12057-1.