Fourth class (class 4) droids, also known as fourth-degree droids, were droids skilled in security and military functions.
Fourth-degree models included Baktoid Combat Automata's B2-series super battle droids, tactical droids, and BX-series droid commandos, all of which were classed as battle droids.
Most fourth class droids were not programmed to speak and interact with organic beings. The KX-series security droid was an exception, though it was not proficient when compared with a protocol droid, whose capabilities were similar to that of the T-series and its successor, both of which were tactical droid models used by the Confederacy.
- Star Wars: Galaxy of Heroes
- LEGO Star Wars: All-Stars — "The Good Stuff!"
- Star Wars Propaganda: A History of Persuasive Art in the Galaxy
- Star Wars: Rogue One: Rebel Dossier
- Star Wars: Build Your Own R2-D2 1
- Star Wars: Build Your Own R2-D2 3
- Star Wars: Build Your Own R2-D2 4
- Star Wars: Build Your Own R2-D2 7
- Star Wars: The Visual Encyclopedia
- Star Wars: Droidography