Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 51224-122 found under Sensing Element Fire Detector Sy by Harwin Plc. The National Stock Number assigned to this part is 6340011850002, and the Federal Supply Class is 6340 Aircraft Alarm And Signal Systems. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 51224-122.