Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 9 5104 1 2SA found under Switch Mercury by Mercoid Corp The. The National Stock Number assigned to this part is 5930009020381, 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 9 5104 1 2SA.