Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B10312ASIZE3A found under Packing Preformed by Somerset Engineering Div. The National Stock Number assigned to this part is 5330005796702, 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 B10312ASIZE3A.