Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B3A4WW6R5REDLINE300F found under Thermometer Self Indicating Bime by Weksler Glass Thermometer Corp. The National Stock Number assigned to this part is 6685002553205, 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 B3A4WW6R5REDLINE300F.