What is the thickness of Model T frame side members?
The Model T encyclopedia on this site states frame rails were made from 1/8" steel. Steel used in the front and rear crossmembers may have varied. For instance, it is a given fact that the thickness of the rear crossmember was increased during the 26 model year to compensate for heavier bodies.
about the same time they put serial #'s on the frames, the rails got thicker too. some time in 26
1/8" would be .125". I measured. A frame with a four-rivet quadrant is .175". A frame with a two-rivet quadrant is also .175". A late 1926 frame is .192". A little of that may be paint, so call it .190". TT is .200".
Here is another recent thread where frame strength & thickness was discussed: http://www.mtfca.com/discus/messages/411944/427652.html?1393942070