Not sure if you call this a tilt pin or pivot point. There are two, one on either side of each widow sash. When the window is tilted out for cleaning or removal, these pins hold the window onto the spring. The little pin part has broken off on a couple of windows.
Tom from SWISCO responded:
March 31, 2017
I'm afraid this exact pin is discontinued, and no longer available. That said, you may be able to use our 20-16 as a substitute. Look it over and see what you think.