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Old 07-07-2020, 01:02 PM   #5
Dan McEachern
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Join Date: Aug 2010
Location: SF Bay Area
Posts: 74
Default Re: O/T What material would you use for new axle shafts?

Brent- use 4140HT, not annealed. 4140HT is 28-32Rc and is easily machined at this hardness. The ductility will still be sufficient at this hardness. You could use annealed 4140 and then have it heat treated after machining if you needed higher strength, but I think the pre heat treated material will work fine. I just made a new axle for our early sprint car out of this material and its tapered on one end and a spline on the other end.
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