Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number QQ-S-763 CLASS 321 0.750IN HEXAG found under Bar Metal by General Services Administration Inc. The National Stock Number assigned to this part is 9510012041132, and the Federal Supply Class is 9510 Bars And Rods. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like QQ-S-763 CLASS 321 0.750IN HEXAG.