Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number ST9M399-1 found under Spacer Special Shap by S A S Industries Inc. The National Stock Number assigned to this part is 5365002859342, and the Federal Supply Class is 5365 Bushings Rings Shims And Spacers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like ST9M399-1.