Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number S1 1-2 found under Resistor Fixed Composition by Carbon Graphite Group Inc The. The National Stock Number assigned to this part is 5905001959643, and the Federal Supply Class is 5905 Resistors. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like S1 1-2.