Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number NG5319PC8 found under Seal Ring Nuclear Coolant System by National Annealing Box Co. The National Stock Number assigned to this part is 4470002436751, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like NG5319PC8.