Early in the design approach, the technological limitations on the minimum size of the endoskeletons restricted Skynet to a much smaller pool of potential Models for use, as they had to be physically large enough to accommodate the Terminator, resulting in the T-800 Terminator and its variant, male and female alike being of herculean or amazonian proportions. Advances in the development of endoskeleton design now allow for a far greater customizable approach to the process, matching infiltration sheaths to the optional chassis construction of units such as the T-888 Terminator.
There are many Models available for Skynet to use in generating the living tissue sheaths, drawn from both live captures on the battlefields of the Future War, as well as archived records from Skynet's pre-Judgment Day databases. Although many of these model runs were initiated for the purpose of specific individual replacement, as a matter of efficiency, entire squads of similarly equipped Terminators are produced together and spread around the battlefields of the Future War  to prevent detection by virtue of duplicate Terminator syndrome.
As long as the endoskeleton is capable of accommodating the selected Model, Skynet continues to reuse the template as required, across Series if it must. Although technically not bound to a model, mimetic polyalloy-equipped units, such as T-1xxx and T-X, do operate with an individualized general "default" appearance drawn from the same sources used for the generation of the models in use by the endoskeletons.
- Main article: Cyberdyne Systems Model
|CSM-102||Terminator||T-808||Medium Assault Infiltrator|
|CSM-104||Terminator||T-803||Light Assault Infiltrator|
|CSM-107||Terminator||T-810||Advanced Stealth Infiltrator|
Terminator: The Sarah Connor Chronicles
The Series 888 Terminator Cromartie was able to artificially reconstitute a replacement living tissue sheath after his original living tissue was destroyed by the Connors. Cromartie later reconstructed his living tissue with contemporary tissues artificially enhanced by his onboard future-tech knowledge with the help of a scientist. After he regained the living tissue, he went under a plastic surgery to make it 92% match to the actor George Laszlo.
Additional direct human replacement infiltration sheaths have been generated for specific missions of the Series 888 Terminators, such as:
- The term "Model" is sometimes confused with "Series".
- The T-600 is also known as T-600 Model.
- The T-X is also called Model T-X.
- In Terminator 3: Rise of the Machines, the Terminator refer itself as a "T-101", while the Terminator 3: Rise of the Machine DVD extras refer to it as "850 series Model 101", "T-850" as well as "T-101".
- The name "T-101" seems to have resulted in the name "T-90".
- So far in Terminator: The Sarah Connor Chronicles, individual Terminators are identified by their names, although it is unknown if they are aware of the differences in Series and Model or not.
- Where available for reference, the numeric portion of the serial number unique ID given to Terminators, as with C890.L, Z000.M, and D810.X also refers to an individual unit's issued Model.
- ↑ Playback of Vick's memories reveal vast chambers filled with duplicate "Vicks" in the episode .
- ↑ Cameron may have run afoul of this when Derek Reese identifies her by sight as "metal" and attacks her in the episode "Dungeons & Dragons" after being tortured by a similar unit.
- ↑ Alluded to again in the novel T2: Infiltrator, when the I-950 discovers she has to deploy multiple Terminators undercover to the same locale.
- ↑ The Terminators in Terminator 2: Judgment Day and Terminator 3: Rise of the Machines share the same Model, although they are a T-800 and T-850 respectively.
- ↑ Possibly placing a face to "TOK715"; from Cameron's promotional poster, identifying her model as TOK715.
- ↑ Cameron's line "T-600 models" in Terminator: The Sarah Connor Chronicles episode "Heavy Metal".
- ↑ A scan from another Terminator display this in the game Terminator 3: The Redemption.
- ↑ John asks about Cameron's "model" instead of "series" in the pilot.
- New Make, New Model, New Mission - The Terminator Files - Robotics article, from TerminatorFiles.com
| Infiltration Outer Sheath|