Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number AN-3.0-52-D1 PC 5 found under O Ring by Core Industries Inc. The National Stock Number assigned to this part is 5331014520891, 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 AN-3.0-52-D1 PC 5.