Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 3712 3 3IN 6 found under O Ring by Dmi Young And Cunningham Ltd. The National Stock Number assigned to this part is 5331999579471, 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 3712 3 3IN 6.