1954 FHC Vent Windows ------------ I am in need of the screws that attach the upper bright hinge to the vent window frame and major window frame. They are slotted CTSK and measure .157" over the threads with a TPI of 36. If anyone can tell me what I need to be requesting it would be greatly appreciated. Thisjust does not line up with any nomenclature I am familiar with. Regards / Joel Miller - Tulsa Ok- USA
I believe that thread is #3BA (British Association thread).
4.10 mm major diameter, 34.8 threads per inch
Try this source.
britishfasteners.com