Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number PX 4 CS found under Washer Blank by Amphenol Rf. The National Stock Number assigned to this part is 5310014863053, and the Federal Supply Class is 5310 Nuts And Washers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like PX 4 CS.