Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number S61-1840 found under Adapter Switch Actu by Psiperipheral Support. The National Stock Number assigned to this part is 5930008255244, 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 S61-1840.