Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number XCS-11B5 found under Switch Assembly by Killark Electric Mfg Co. The National Stock Number assigned to this part is 5930014247202, and the Federal Supply Class is 5930 Switches. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like XCS-11B5.