Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 54N31 found under Cup Ceramic by Cni Ceramic Nozzles Inc. The National Stock Number assigned to this part is 3439010444104, and the Federal Supply Class is 3439 Miscellaneous Welding Soldering And Brazing Supplies And Accessories. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 54N31.