Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 540-4193 found under Fan Assembly Centrifugal by World Wide Technology Inc. The National Stock Number assigned to this part is 4140015233750, and the Federal Supply Class is 4140 Fans Air Circulators And Blower Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 540-4193.