Steve B wrote:
I need a bearing that has a SQUARE "hole". I have heard these are used on
disc harrows. It is to be used to stabilize a piece of 2" hitchstock that
is about 12' tall. The center bore has to be 2" square. What do I Google
or ask for at a farm supply house? Thought I'd shop ahead on Google before
going to the local farm supply house.

Steve

Why wouldn't you make a 'round to square' adapter
with your lathe and welder?
That way, bearings are 'way cheaper.

http://www.metalsdepot.com/

T1212250 A500 Steel Structural Square Tube
2-1/2 X 2-1/2 X 1/4 wall

Clean up ID with files,
Press into ID of pipe,
Weld and turn pipe OD to
press fit with bearing ID.

--Winston ---Sell hundreds on eBay. Make a lot of money.