Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number PTKBC2221B-C39 found under Switch Lock by Honeywell Aerospace. The National Stock Number assigned to this part is 5930010493211, 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 PTKBC2221B-C39.