850F30RE - 

These molded-construction metal housed axial-lead performance resistors are available in higher power ratings than standard axial-lead resistors and are better suited to withstand shock, vibration and harsh environmental conditions. Metal-Mite resistors are aluminum housed to maintain high stability during operation and to permit secure mounting to chassis surfaces. The metal housing also provides heat-sinking capabilities, allowing the units to exceed the power ratings set by Mil specifications. Meets or exceeds MIL-R-18546 specifications. Solder coated axial lead terminals. Tolerance: ±1%. Power rating based on chassis mounting area and temperature stability. Proper heat sink for wattage is: 4" × 6" × 2" × .040" aluminum chassis for 5 and 10 watt units; 5" × 7" × 2" × .040" aluminum chassis for 25 watt units; 12" × 12" × .059" aluminum panel for 50 watt units.