Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 00439B643 PC1 found under Bearing Turbine by Curtiss Wright Electro Mechanical Corporation Div Steam And Air Solutions. The National Stock Number assigned to this part is 3110008271421, and the Federal Supply Class is 3110 Bearings Antifriction Unmounted. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 00439B643 PC1.