2 Pack UCF204-12 Pillow Block Bearing - Square Flange 4 Bolt Bearing - Bearing Steel with 3/4 inch Bore - Self Alignment

I'm only returning these as I couldn't make them work with my specific photo-processor design/build application. The price and quality seemed to be there. For heavy-duty industrial load applications, these may not be the ones, but for moderate load and RPM, they should be OK.....just not for the rotating cathode of my Ag (silver) recovery system.Let's just hope that Elon Musk is not using them on his spaceships to cut costs.

I use a lot of these bearings - there are 16 of them in my 6-wheeled robot (6 axles and 2 jackshafts) alone, and they get put through a lot every year. The only problem I've had with these is that the housings are fairly brittle. They need to be mounted to a backing plate and should have washers on top to keep from stressing the housing. I've cracked a couple, mostly when having to force out a frozen shaft.

Good flange bearing

Similar to popular brand mountable bearings by other manufacturers on Amazon. They work as presented, bore is true 5/8". Seem rugged.

After testing several dozen times with some inexpensive calipers, the ID does appear to be 0.750", or maybe just a little less.What makes these a lower quality is that the cast metal base is hollowed out on the back. If you're bolting this to anything that will flex (wood, non braced steel, etc), then you can cause a crack in the base.I have some gray 204-12 pillow blocks from another brand and their back is solid, much stronger at the expense of some weight.Be careful with your application using these, since the back side is hollowed out and won't distribute the load well on whatever mounting surface you have.

Going to be making a drum sander, using these as the bearing supports on either side. They're very heavy, of course, being cast iron and steel. The bolt holes are clean and in line with each other, not scattered over the casting. They have decently smooth bearings in them, along with a grease fitting to keep them lubricated for hopefully a long life. The centers seem concentric, and when bolted together face to face, show that they are both in line with each other. Should make mounting and centering your shaft near perfect. I won't have exact measurements until the shafts get here and I get them mounted. But, based on what I see right now, these should be within a few .000 of what I need. I'm sanding hardwoods, not precision machining, so these would be perfect.

These are nice solid bearings with zerk fittings. Other reviewers have mentioned the blocks cracking, mine haven't cracked but I can see the issue: because the back side of the block is sunken-in to save iron weight, the actual mating surface with material it's mounted on is pretty small. Any flex on the block (e.g. from over-tightening the mounting bolts) coupled with the brittle casting metal leads to cracking. Not a big deal for my application (which is mounted to a wooden block), but something to be aware of if you're using this in a lathe or bandsaw or something rigid like that.

good