Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 2500-000-18F-NM found under Thermometer Self Indicating by Koehler Mfg Co. The National Stock Number assigned to this part is 6685002422203, 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 2500-000-18F-NM.