Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number SB42B TD40A11 found under Switch Pressure by Automatic Switch Company. The National Stock Number assigned to this part is 5930014247445, 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 SB42B TD40A11.