I have a drawing for a small steel part used in an airplane propeller hub. It is has very small splines and I guess it has to be broached. The old drawing (circa 1944) calls out 1132 steel. I can't find it in Machinery's Habdbook 25. Usually 4130 is used in many aircraft applications. But I am guessing the reason for 1132 is ease of machining. It's not in a very critical application. Can anyone tell me the exact equivelant or if there is a new number for the same steel? And perhaps with today's state of the art machines, 4130 can easily be machined.