Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 81MLS00RW52Y found under Thermometer Indicating Capillary by Weksler Glass Thermometer Corp. The National Stock Number assigned to this part is 6685002908186, 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 81MLS00RW52Y.