BRAD D Posted March 9, 2003 Share Posted March 9, 2003 I was wondering if I just got some new stub axles machined of 300M exactly the same as stock 280Z. How strong would they be and how much it would cost? I have a machinist buddy that works at Bristol Aero Space, I wonder if he would make me some. What do you guys think? 300M is a low alloy, vacuum melted, steel of very high strength. Essentially it is a modified AISI 4340 steel with silicon, vanadium and slightly greater carbon and molybdenum content than 4340. 300M has a very good combination of strength (280 to 305 ksi), toughness, fatigue strength and good ductility. It is a through hardening alloy. Quote Link to comment Share on other sites More sharing options...
johnc Posted March 10, 2003 Share Posted March 10, 2003 You would also need to machine a matching set of companion flanges. Generally the metallurgy of the 27 spline stub axles are fine. They fail at stress risers (usually in the splines) or at the fusion weld of the axle to the wheel stud flange. 300M would be a good material choice although its probably a little overkill. You would also need to surface treat the areas where the bearings ride. I would be interested in a set with matching companion flanges if the splines were shot peened and polished after machining. Quote Link to comment Share on other sites More sharing options...
BRAD D Posted March 10, 2003 Author Share Posted March 10, 2003 You think i would need companion flanges as well. You think the 300M stubs would rip up the stock flanges? What happens to a stub when it pops? I have only seen the ones that break at the base of the splines. Quote Link to comment Share on other sites More sharing options...
denny411 Posted March 10, 2003 Share Posted March 10, 2003 I`m going to check with MOSER eng. to see what they can come up with. I`m thinking stronger stubs,in 4 or 5 lug. With companion flanges to match the R230 cv`s and the zxt cv`s. Quote Link to comment Share on other sites More sharing options...
johnc Posted March 11, 2003 Share Posted March 11, 2003 Road racers break the wheel stud flange off the shaft. If youi're lucky that just means a trashed brake drum and a big spin. If you're unlucky, it means a rollover at speed as the wheel and drum go flying away from the car. 240/280 stub axles generally last about two years in a road racing environment before you'll start seeing cracks in the fusion weld. Companion flanges fail almost as frequently. Quote Link to comment Share on other sites More sharing options...
BRAD D Posted March 13, 2003 Author Share Posted March 13, 2003 what are the stock stubs made of? cast? Quote Link to comment Share on other sites More sharing options...
johnc Posted March 13, 2003 Share Posted March 13, 2003 The shaft itself is a medium carbon steel that appears forged. The wheel stud flange is mild steel that is fusion welded to the stub axle shaft. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.