Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 17ST4 found under Bar Metal by Tw Metals Inc. The National Stock Number assigned to this part is 9530009735701, and the Federal Supply Class is 9530 Bars And Rods Nonferrous Base Metal. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 17ST4.