Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number ST0-4.0-51-05-3-0 found under O Ring by Core Industries Inc. The National Stock Number assigned to this part is 5331014631529, 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 ST0-4.0-51-05-3-0.