Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 298075 PIECE21 found under Nut Self Locking Hexagon by Oil States Industries Inc. The National Stock Number assigned to this part is 5310011327751, and the Federal Supply Class is 5310 Nuts And Washers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 298075 PIECE21.