Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B3W-4050 found under Switch Push by Penny And Giles Aerospace Ltd. The National Stock Number assigned to this part is 5930996017900, 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 B3W-4050.