Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number M3LT-R4 A UL found under Indicator Temperature Thermocoup by M Systems. The National Stock Number assigned to this part is 6685016067689, 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 M3LT-R4 A UL.