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The sentry bot helmet is a helmet featured in the Fallout 4add-on, Automatron. It is the disembodied head of a sentry bot, hollowed out to accommodate for a human head. It has a ballistic resistance of 10 and an energy resistance of 5. It can be seen as a slightly improved variant of the metal helmet.
Sentry bot helmets can be found on members of the Rust Devils faction starting at level 15, when the Automatron questline can be started. It can be considered a middle ground between "Tier 2" and "Tier 3" helmets, such as metal helmets and combat helmets, respectively. It's increased ballistic resistance compared to energy resistance can cause it to be seen as an improved form of the metal helmet. Once it has been upgraded, one can push its effectiveness past that of a standard combat helmet.