Pin drive bolts splitting Help Please

[Ant]

David,
thanks for your experience, that makes sense, and with the quality of your cars the right metal for each job is so important, as you mention hard can still equate to elasticity.
Will keep an eye on this post, and when suitable I would like some pins made.

My hubs are drilled for 1/2" which could have been 3/8" but I am stuck with that size! Interestingly enough I was looking at some single seater race cars Lola T332 and others they have a thin drive flange and piddly little drive pins transmitting 500bhp through their massive rear tires, but they are quite light, so its how the car is engineered.

Originally Posted by David Kirkham

Ant,

Hard does not always equate to brittle. Think of a really high quality steel that is properly heat treated. I once saw a F1 1/2 shaft from a crash that was bent at 90 degrees! It didn't break! It didn't even have a crack. But, that junk "free machining steel," "leaded steel," and other such abominations can be quite soft and the lead inclusions will make it brittle. Perhaps that is why we have seen so many of the threads torn and broken. I would have to do a chem and hardness on the pins, but I don't know if I want to spend the 100 bucks on the test.

As for making you pins, that is no problem.

David