Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number P16R4 found under Copper Billet by General Services Administration. The National Stock Number assigned to this part is 9650008924015, and the Federal Supply Class is 9650 Nonferrous Base Metal Refinery And Intermediate Forms. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like P16R4.