Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number A0R-2546-5 IT16 found under O Ring by Sheffer Corp. The National Stock Number assigned to this part is 5331012141920, 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 A0R-2546-5 IT16.