PGN 6001-ZZ Shielded Ball Bearing - 12x28x8 - Lubricated - Chrome Steel (10 PCS)

EXCELLENT DEAL AND PRICE WILL BUY FROM THEM AGAIN

Pour un démultiplicateur de vitesse.

Can Chinese bearings be any good? Sure, I have multiple examples of that. But these bearings do not pass my quality tests.There is nothing special about these bearings, so they have to be ABEC 1 tolerance class and hopefully a little better. For 28 mm OD the ABEC 1 tolerance is -0.009 mm. I randomly checked 3 bearings out of 10 and this is what I've got with my Mitutoyo digital micrometer, measuring the OD in several directions:#1 - 27.992-28.002#2 - 27.988-28.008#3 - 27.995-28.006As you can see the outer race is egg-shaped and deviation is bigger than the allowable tolerance. This bearing is for a die grinder spindle, running at 27000 RPM. I do not think it would be happy with such replacement bearings.For comparison I have checked the old die grinder bearings and a few other bearings I had on hand. All of them were much better than ABEC 1 level#6001 Outdo beafring (old one) was out of round .002 mm#6203 Xike bearing was out of round .003 mm#6204 HCH bearing was out of round .005 mm#6204 SKF bearing was out of round .002 mmMy conclusion is quite simple - I will not use these bearings for my die grinder. They may still be OK for some applications, which do not require high speed or precision.

hubby happy with it

I love these bearings. I have a bariatric rollator Walker. I am 70lbs under the weight limit but the bearings in the wheel forks keep breaking and the whole rollator has to be replaced. The last one I got, the bearings broke the first time I sat on it. So I ordered these bearings and replaced them myself. It's been several months since I installed these bearings and they're still intact and working great and they cost less than a dollar apiece.