Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number C-65-4 found under Tester Pyrometer And Thermocoupl by Wahl Instruments Inc. The National Stock Number assigned to this part is 6685011874083, 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 C-65-4.