Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number U31403-72 found under Fitting Structural Component Air by Cole Parmer Instrument Co. The National Stock Number assigned to this part is 1560015170258, and the Federal Supply Class is 1560 Airframe Structural Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like U31403-72.