Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number T01-0348-90 found under Potassium Iodide So by Bayer Corp. The National Stock Number assigned to this part is 6550004109476, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like T01-0348-90.