Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 3FT-X-18FT-LG found under by Shelby Williams Industries Inc. The National Stock Number assigned to this part is 5680010151399, and the Federal Supply Class is 5680 Miscellaneous Construction Materials. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 3FT-X-18FT-LG.