Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number A4051-000009 found under Switch Thermostatic by Amherst Systems Inc. The National Stock Number assigned to this part is 5930016019386, 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 A4051-000009.