Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number RTS-37-A-100-C-5.5-3-H6 found under Thermocouple Immersion by Hy Cal Engineering. The National Stock Number assigned to this part is 6685011999609, 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 RTS-37-A-100-C-5.5-3-H6.