cutting a bearing seat in 4340 tube

I need to cut a bearing seat into the end of a piece of 4130 tube. The tube is 1/2 inch with an 0.083 wall. So that's .5000 OD and .3440 ID. The seat needs to be 0.3745.
I can drill and ream to .374, but I need to get that last .0005, without going over. I can't get any boring tool I have into that small a space. I would appreciate any suggestions you guys might have.

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Originally Posted by jimlake

I need to cut a bearing seat into the end of a piece of 4130 tube. The tube is 1/2 inch with an 0.083 wall. So that's .5000 OD and .3440 ID. The seat needs to be 0.3745.
I can drill and ream to .374, but I need to get that last .0005, without going over. I can't get any boring tool I have into that small a space. I would appreciate any suggestions you guys might have.

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Get it to .374 then just use sand paper to bring it to .3745, be careful, use fine grit, watch your fingers. Check the size often while sanding.
Good luck.

I found a .3745 ream on MSC. Thx.

Adjustable reamer also would work.