Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 40L00819-WWWW500 found under Switch Push by Staco Systems Inc. The National Stock Number assigned to this part is 5930016127645, 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 40L00819-WWWW500.