Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B3F 4055W A 12531 B found under Switch Push by Tegam Inc. 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.