They seem very "heavy duty" to me. There is a socket head cap screw (probably the metric equivalent to 2-56) at the pivot, and the material is very stiff, about 1/8" thick. If I had put them in my Corsair's flaps I would not be worried about the hinge giving out. I bought them because I'm a hoarder when it comes to stuff you can never find when you need it!
Sam