JIUWU 10 pcs 3x6x2.5mm Ball Bearings MR63ZZ L-630ZZ 673ZZ Bearings Miniature Deep Groove Ball Steel Bearing

I have not had any problems with the miniature bearings. I needed them for a 3D printed train axle. The bearings fit the brass rod and inserted into the train with no problems. The bearings were exactly as described.

I almost didn’t buy these because some reviews said the dimensions are way off, but I went for it and am glad I did: they do have an ID of 3mm, an OD of 6mm, and a thickness of 2.5mm. I also bought some 3x7x3 bearings just in case, and am glad that I don’t need to use those because they wobble quite a bit on a 3mm rod. Meanwhile these ones are actually impressively solid by comparison, with very little wobble. All in all a great mini bearing

Low quality bearing but great for the low cost and great in a quick pinch, especially with McMaster-Carr being out of almost all steel bearings.

Worked for my application, not using in a high speed or high load project.

These bearings were a fit for the 4 side guide bearings (2 bearings on each of 4 guide posts, 8 individual bearings total) on my 2 year old Bauer Porta band saw (bought at HF). I didn't think I had used it much. Retired and cut some steel in fabricating projects in my driveway (No steel bird house jokes, please). I noticed all the cuts were pulling to the left. Thought it was bad blades because one side of the teeth was wearing off. Upon further review, the upper side bearings had totally taken a crap. Like I said not much use on them in my estimation. Anyway, measured one of the surviving, recognizable bearings and bought these. They look good, but I'm a retired hobbyist.. Easy to replace. Good fit and finish as they say. I've used the saw once since replacement and it seems to work as expected. I changed them all, but kept the few survivors for the bull pen with the remain 2 new ones. I can't comment on how they will last. They can't be worse than original, so worst case, if I have to replace every 2 to 5 years I can live with that.

So far these bearings appear to be very well made.

These are the the replacement bearings for your Accurite weather station wind meter. Be sure to go by about twice a year and spray a little wd 40 or graphite into the bearings. Mine is still going and going!

625ZZ Bearings i purchased were in spec but sounded worse than the ones that were taken out. with2k hrs. Not sure if they were without grease or damaged internally . whatever the issue they were taken back out and others purchased from another on Amazon and were super quiet like they should be