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Combat chassis

From Terminator Wiki

A combat chassis is part of the metallic frame used by terminators. The Series 800 has a combat chassis made up of hyperalloy.

It is unclear whether the combat chassis is considered part of the endoskeleton, or if it is considered to be a component that complements the endoskeleton.

Quotes

Kyle Reese: The Terminator's an infiltration unit, part man, part machine. Underneath, it's a hyperalloy combat chassis - micro processor-controlled, fully armored. Very tough. But outside, it's living human tissue - flesh, skin, hair, blood, grown for the cyborgs...
The Terminator

Charley: (talking to Cameron Phillips) You know little girl, you freak me the hell out. On the outside you're just pretty as a picture. But on the inside... you're a...
Cameron: Hyperalloy combat chassis.
The Sarah Connor Chronicles, Dungeons & Dragons