Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 81MNN00RW40Y found under Thermometer Indicating Capillary by Weksler Glass Thermometer Corp. The National Stock Number assigned to this part is 6685001117124, 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 81MNN00RW40Y.