Thread Count Extends Beyond Pool

I am using SJSAS 8.2 and have a thread pool of 200 specified.

We had an extremely busy day yesterday with 400+ users in our application and our thread pool reached 345.

The instance eventually crashed at 1:15 in the morning.

Is there any reason that my thread count almost doubled the allocated pool and any way to alleviate the issue? What exactly does the App Server do when it reaches the pool limit, queue requests?

I guess the server queue the requests.

There must be some setting like 'Max Wait Time' and 'Idle Timeout' which can be set to handle these scenarios. You may need to check the server implementation for this.