Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 13-2X2-5-21B6 found under O Ring by Victoria Technologies. The National Stock Number assigned to this part is 5331144023278, 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 13-2X2-5-21B6.