uxcell 683ZZ Ball Bearing 3mm x 7mm x 3mm Double Shielded Deep Groove Bearings, Carbon Steel 20pcs

Low quality.

Very fragile bearings, they do not run smooth and can feel them grabbing when they turn. most were off-centered (see attached picture) and some had a lip in the bore, preventing a 3mm shaft from going through. These are good if you want to piss someone off and see their project fail.

I tested all 20. There are no issues. These roll smoothly, and the machining is nice. I can find no play in them at all, and yet they are tight with minimal rolling resistance. I will be purchasing these again when needed. Big 5 star. Thanks.

snaps right into place

I used these bearings in a small planetary gear that I printed. No issues with the bearings so far. In my case I dont see the printed material outlasting the bearings so Im not too worried about their wear resistance.

JUSTO LO QUE BUSCABA

Great little bearings. All of them seem to be the right dimensions and spin freely. Would recommend

Hole diameter is 2.65mm and won’t fit a 3mm shaft!

Works perfectly. Just what I needed as advertised. I would buy again.

Works good for the price but they came with thick grease or something smeared inside. They dont spin good because of it until you oil them good then they are ok for the price