Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 6640201 PC4 found under Glass Plate by Emerson And Cuming. The National Stock Number assigned to this part is 5620013508638, and the Federal Supply Class is 5620 Tile Brick And Block. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 6640201 PC4.