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Anyone konw a max Ap ( 320X ) i can use with an utm sg 310 ?
There's no hardcoded limit. But you will be able to find a number from this post https://community.sophos.com/products/sophoswireless/f/questions-issues-bugs/110096/how-many-access-points-can-be-managed-and-controlled-by-a-sophos-xg-appliance. It is for XG hardware but the number should not wary much for SG hardware for the maximum AP support.
A year ago, the maximum number of APs for an SG310 was 125. Bear in mind that that's a "marketing" number, so the other loads you have on your SG will decrease the practical number for you. The number of 'Separate Zone' WLANs and the number of SSL VPN tunnels play heavily in the calculation.
Cheers - Bob