Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 112FW12-4R1 found under Switch Proximity by Honeywell Aerospace. The National Stock Number assigned to this part is 5930010569598, 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 112FW12-4R1.