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.

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

Theyre bearings. They spin.

snaps right into place

JUSTO LO QUE BUSCABA

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

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.

Very accurate and rolls very smoothly.

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.