Is the 95-112 strong enough to keep screen from buckling?

A home owner from Pennsylvania says:
The 95-112 Corner Key - is that piece strong enough to keep the bottom and top of the screen from buckling? I need to puchase enough to do 12 windows.
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Dave Sr. from SWISCO responded:
The 95-112 corner key is for 1/4" roll metal hollow screen frame. The corner key will not keep the screen from buckling or hour-glassing in the middle. If that is your problem, you must install a tie bar mulling in the middle of the screen. This problem could also be caused by installing the screen mesh too tight.
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