Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 1852327 found under Back Up Ring Prefor by Caterpillar Inc. The National Stock Number assigned to this part is 5330015661051, and the Federal Supply Class is 5330 Packing And Gasket Materials. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 1852327.