Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 9X0199 found under Boot Dust And Moist by Caterpillar Inc. The National Stock Number assigned to this part is 5930013508643, 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 9X0199.