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Never seemed fair to nail the "lazy" tag so permanently on the "Susans" but that probably has no "bearing" on the issue. Also called turntable bearings, they are the square or circular flat ball bearing devices YOU bolt between two flat objects to achieve rotation. Like that spinning center section of a Chinese restaurant table. We had these in surplus once and they were quite popular. To our chagrin, we discovered they could be bought commercially for the same price. So we did. The 4" version is rated for a 300lb. load and the 12" (round) for 1000lbs.
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Pillow Block
Just a real soft name for a hunk of cast iron that holds a sealed bearing. This one measures 3-1/4" wide x 2-3/4" tall x 1-3/4" with a pair of 3/8" mounting holes in the bottom and a 1-15/16" sealed bearing with a 1" ID x 1-3/8" dia x 1-11/32" long bushing with two setscrews to hold a lube-fitting on top.
$8.95 EACH
You Enjoy A Nice Swivel?
Well, who doesn’t, really? And yet most of us confine our swiveling to our local dive. Until now, when you can buy genuine authentic bar-stool swivel plates and make home swiveling a reality. In heavy-duty steel, double 7” square plates are separated by a plethora of steel ball bearings, and have 1/4” mounting holes on the corners. Might be a touch stiff at first, but a little break-in swiveling and a drop of oil or dab of grease will fix that. Please note: These are designed to be stiff not swivel freely. To test, add oil or grease, stand on and twist and shout like the Beatles. 
$8.75 EACH
My, What Big Bearings You Have
Biggest industrial bearing we’ve seen in a dog’s age, and we’ve got some old industrial dogs around here. This shielded, single-direction roller thrust bearing is 80mm OD x 30mm ID x 36mm thick. Unique bore. Will fit either 30mm square or 31mm round shaft. Part #208PP5.
$7.50 EACH
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