Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number SM 18 12F 458 found under Switch Pressure by Nason Company The Inc. The National Stock Number assigned to this part is 5930015287523, 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 SM 18 12F 458.