Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number C304-57000 found under Cover Ring by Abb Inc. The National Stock Number assigned to this part is 2950015501318, and the Federal Supply Class is 2950 Turbosupercharger And Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like C304-57000.