Originally Posted by
lacey
You need to be careful with materials to
If they are to hard they also will give up
Think cr mo is a European en
But it is a touch harder as I am looking at materials
At the mo to make some centre lock stub axles
To go with the bbs e50,s I have made
Yes, you are correct, you can't go to hard with the material. Something between 38-45 Rc is usually about good for an axle. I have not tried to measure the hardness of the Cossie stubs since they are induction hardened only in the spline area and it would be difficult.
But, going from a 1040 to a 4340 even at the same hardness can net you a 50-75% increase in strength. I purchased some 928 stubs for the heck of it and had them X-rayed, they ARE a Cr-Mo steel.
I was going down a path of having some custom 30 spline stubs made, but the machine shop jacked up the price right when I was going to place the order. So, I am trying to decide if I should just not worry about it, at least this season. I wanted to try some drag radials this year, but I may just leave the stubs and skip that.
Tim