- Jan 20, 2019
I have thermal fit bearings and dies together hundreds of times. Works good but I use an oven only to 170 for bearings to not cook the oil out of the bearing or compromise the seal and put the shaft in the freezer until -20 F or on a day like today (-8 F out at noon) I would put the shaft outside. You have to be quick about it. For dies I've used a torch or 1000 degree oven cause they aren't delicate like a bearing.