Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 118031989 found under Switch Fiber Optic by Emc Corp. The National Stock Number assigned to this part is 6021015646727, and the Federal Supply Class is 6021 Fiber Optic Switches. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 118031989.