Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 99-031-99 found under Switch Clamp by Vacuumatic North America Inc. The National Stock Number assigned to this part is 5930010670020, 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 99-031-99.