The 31 1125 from Smiths Interconnect is a Resistor with Resistance 7 to 1000 Ohms, Power Rating 150 W, Tolerance ±5%. Tags: Flanged, 7 to 1000 Ohms, 100 Ohms, 10 W, Surface Mount Thin / Thick Film RF Resistor. More details for 31 1125 can be seen below.