Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 571-24NB found under Gage Water Temperature by Hamilton Watch Co Inc. The National Stock Number assigned to this part is 6620004018489, and the Federal Supply Class is 6620 Engine Instruments. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 571-24NB.