Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 188990PC320 found under Ring Thrust Bearing by Dresser Rand Co. The National Stock Number assigned to this part is 4310000357308, and the Federal Supply Class is 4310 Compressors And Vacuum Pumps. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 188990PC320.