Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number A1572B1 8 found under Spacer Sleeve by Useco. The National Stock Number assigned to this part is 5365010912450, 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 A1572B1 8.