Hi Goat,

I got to thinking about what you were asking. I gave you a general answer for an open-ended situational question.

Press fitting can change a little due to lateral surface area of the item pressed. I gave you .0002 as general machining rule of thumb for all press or “tight” fits. You can go up to .0005 per inch of diameter if the item is narrow in length. One inch is a small diameter like a bronze bushing or plain bearing.

I used .0002 as a rule of thumb. Because the most bearings I dealt with were upwards from four to five inches to as high as 24 inches on the outside diameter. Those are much longer. 24-inch diameter x .0002 still gives you a 0.0048 interference to a 0.012 tight fit if one uses .0005.

I should have said "minimum" in my last post for your 1.000 bearing. ID or OD you should always check a bearing and use that micrometer for best fit up when possible. Another thing you can do is check with the bearing house for specifications even though the “standards” were set, by the ASM, since like 1933, I think.

That was off the top of my head again.

We hope China uses them. Japan’s steel got better and then our equipment got better to make our steel cheaper (what little we make now), thanks to them! The Oxygen lance made a big difference.

Phil