Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B3F-4055W A-12531-B found under Switch Push by P P Minc. The National Stock Number assigned to this part is 5930014468878, 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 B3F-4055W A-12531-B.