Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 20640L15-88-135 found under Switch Thermostatic by Texas Instruments Incorporated. The National Stock Number assigned to this part is 5930001633976, and the Federal Supply Class is 5930 Switches. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 20640L15-88-135.