We produce our boards according to the latest industrial standard IPC A-600 (x) Class II.
Should you require different tolerances for specific goals, you can indicate that in the order details in the calculator.
Of course this has to visible in your PCB data also.
We will then analyze your data accordingly and if needed report back in case your requirements should not match our manufacturing capabilities or if extra costs need to be introduced to achieve your request.
For more information please see our PCB Design Guidelines.