Qualified to MIL-PRF-55182 (1W at 125°C) specs, RNR/RNN75 established-reliability metal-film resistors come in a glass-to-metal enclosure that provides a hermetic seal in an inert gas atmosphere to protect the resistive element from virtually any harmful environment. The resistors use solid-core construction and their 0.25" diameter reduces board space requirements. Resistance range is 49.9 ohms to 1.21 Megaohms.