Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number S-9-12-5-120 found under Blanket Heat Electr by Aircraft Service Co Inc. The National Stock Number assigned to this part is 4920013002352, 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 S-9-12-5-120.