Most axle clamps I've seen have a step where the part that touches the bearing race extends past the rest of the side of the clamp. I've never had one of those not have enough clearance. It would take a lot of heat to grow it .125".
You would only be looking at the change in length from the inner bearing race to the outside of the cage. For that bind. But, let's just assume cage barrel is 6" long and the whole expansion matters. A rise in temp from 75 to 300 is around 30 thousandths.
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