The Series 600 Terminator, or T-600, is a Terminator series mass produced by Skynet starting in 2016. The Series 600 Terminators serve as early Infiltrators featuring titanium alloy endoskeletons which were sometimes covered in rubber skin. As a result of their rubber skin covering, Resistance fighters could easily spot the T-600s in the field.
In the original and Terminator: The Sarah Chronicles timelines, the Series 600 has been established as a human sized Infiltrator that heralded Skynet's shift from the use of Non-Humanoid Hunter Killers to the Humanoid Hunter Killer Unit that would become known as a Terminator.They were mass produced humanoid battle units manufactured by Skynet from the original designs and test models constructed by Cyberdyne Systems Corporation. Standing almost six feet tall and weighing almost 800 lbs, the T-600's endoskeleton is very powerful and can lift objects almost five times its own weight or punch through concrete and metal with no damage to its reinforced servos. The T-600 Series is capable of running at a constant speed of almost 60 km/h (37 mp/h), with short bursts of up to 75 km/h (46 mp/h). However, these bursts of speed tax the servos and the joints of the leg assemblies. Due to the lack of technological advancement at the time of their conception and the nature of Skynet's logic, the Series 600 Terminator is fabricated with a smooth latex rubber skin to hide its mechanics rather than the living tissue that would be used by the successor Series 800 Terminator. This fact makes the Series 600 Terminators easy to recognize and thus disable. But the rubber skin was certainly effective in cases of limited visibility.
The Series 600 were the Infiltrators that triggered the design of the Series 700 Terminator which evolved into the Series 800 Terminator.
Essentially the Series 600 Terminator can be considered a streamlined and lightweight version of the Series 500 Terminator, with improvements to its CPU and a complete redesign of the head to allow for a near human look and working jaw. This design carried over to the successors of the unit, such as Series 800. This was probably because the human-like endoskeleton made it easier for the living flesh covering of later Terminators to actually look like there was actually a human skeletal beneath, unlike with previous, bulkier models which might make the covering bulge or droop in improbable places.