What are S jaws?

The coax comes standard with the "s" jaws, they have a L/S set that is larger on the large side and smaller on the small side. If you go to the web site http://search.forsterproducts.com and enter a cartridge there is a table with the appropriate jaw size for each cartridge.
Select case campatibility tab on the second page for the reference table.
https://www.forsterproducts.com/product/shell-holder-jaws-for-co-ax-press/?attribute_size=S (Standard)

jski said:

I see two prices for the Forster Co-Ax press. One with “S jaws” and one without. What purpose do these “jaws” serve? Search about but didn’t find an obvious answer.

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Never seen it sold without jaws, can't hold a case without them.

The "s" jaws will work for the majority of cartridges .... those few that are not covered by the "s" can be covered with the "LS" jaw .... I use the "s" and have since late '70s .... load cartridges from the 9mm through the .375 H&H(based) along with the WSM size rims ...some twenty plus cartridges ....

If ....if I ever need jaws for the few odd size ...I will purchase the "LS" jaw ....

jski said:

So these "S jaws" are used in lieu of a case holder? And are simply a built in feature of the press? I obviously misconstrued what I saw. Brownell's is selling the "Forster Co-Ax press with S jaws" or Midway is simply selling the "Forster Co-Ax press".

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They are both selling the same press, just describing it differently. The S jaws eliminate the need for shell holders.
You can use shell holders if you get the adapter plate pictured in post #2.

Sorry, already done! Might help to explain the jaw system is the shell holder in the Co-Ax. Being double ended the jaws can be reversed in the press to handle two different head sizes. The S covers most commonly found head sizes. Just to confuse things there is an adapter available to use conventional shell holders. Many people find the Co-Ax system much superior to the conventional pop-in shell holders. I'm not one of them. There are cobwebs on my Co-Ax.

The small ends of the S jaws have no problems holding the M1 Carbine cases securely.

daboone said:

The small ends of the S jaws have no problems holding the M1 Carbine cases securely.

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.32 ACP also ....