［3 Pack］6204-2RS Ball Bearings – Bearing Steel and Double Rubber Sealed Miniature Deep Groove Ball Bearings for Electric Motor (20mm x 47mm x 14mm)

If you are familiar with bearings, you should know what to expect when you pay this much for so many of them.If you arent familiar with bearings, this are cheap, and are not designed for applications where you need them to be very smooth. I specifically needed bearings that were not super smooth so these worked perfectly. I have not put these in a skateboard or any other wheel and I would imagine that if I had I would be disappointed comparing them to proper skate bearings.

I ordered two packs of these bearings to use with my filament system for my 3D printer. I was pleasantly surprised when I opened the packs and tested all the bearings. All of them moved very smoothly (this has not been my past experience with bearing packs from other sellers). These bearings come greased, which was perfect for my application. However, if you are buying these to use in fidget spinners you will want to take the side shields off and degrease the bearings first in order to get effortless spins. Overall these bearings are excellent for the price and I will continue to purchase them in the future.

These bearings looks to be to spec. The seals look tight and bearing assy rolls smoothly. There's no wobble, no play in the bearings. Came packaged in a neat little container for storage if you don't use them all at once (mine came in a lot of 4). No real complaints but yet to be installed in the tensioner mechanism on a mower drive belt system... I predict there will be no issues.

Excellent value for simple projects. I wouldn’t use in a skateboard or scooter as there is no anecdote rating and it seems there is too much play greased or not. But for simple projects where a bearing would make things better I recommend these. I used the law for filament guides and spool rollers for my 3D printers. Would NOT RECOMMEND for replacing bearings in tools or electric motors.Pros: easy to remove and replace seals. Accurate dimensions, no rust present inside or out, rolls smooth at low speeds.Cons: contents dripping in oil upon unpacking, oil hides gummed up grease but a degreased and ultrasonic cleared that up, a little play in the bearings while ungreased, horrible chatter at 300 rpm (Greased, no weight load).

I used these in 3d printer mods to feed filament more smoothly. They all spin smoothly enough for that purpose and they all have accurate dimensions - I didn't measure them, but I designed the mods to fit snugly with the expected dimensions and they all snap fit like a charm.

I'm using these for various 3D projects, and they do the job. My only complaint is the nice little plastic case they come in was damaged and won't close securely. Otherwise, the bearings themselves are well made, spin as they should, and appear to be pretty durable.

Was skeptical due to some reviews saying that only a few were good out of the bunch, but I found every single bearing in the box to spin freely. They use a viscous grease, so if you need them for higher speed applications I would clean them out and use a lighter grease or oil.

Just received these bearings, package was damaged, obvious this was done when packaging as the damage is under the label, and taped over. Not really an issue for me but worth note.The pro's:I decided to test them in a 3D printed fidget spinner, to see how well they hold up.They are heavy, good for this application, but for some this might be an issue.They are solid very little wobble.They are very silent. (You might be able to use these in class without your neighbor knowing.)The Con'sHowever, they have high friction. So, high that you can't spin them on one finger. I have some 3D printed 608 bearings (So fully made of plastic and not very accurate.) I compared these against and they performed similarly to the 3D printed bearing without oil and not broken in.ConclusionThese bearings are good if you need a solid and stable bearing for precise movement. However, they are not good for high speed applications, such ad roller blades or fidget spinners, they just have way too much friction.Please not I did not test them in a powered high sped application, so they may perform better at higher temperatures as it appears that the friction may be due to the type of internal lubrication used. If someone does get to test them in such a scenario please let me know.

Buen empaque, buena califad

Comes in nice sturdy container. Size is what I needed. Used them for rollerblades. Wheels don’t roll amazingly well which I thought they would with new bearings but I guess for that I’d have to buy really expensive ones.

Great bearings for projects that need them. I can't comment on how well they might work for skateboards and skates.

Los rodamientos no funcionan bien. NO giran libremente. Decidi darles el beneficio de la duda pensando que a lo mejor seria un tema de peso al montarlos y no fue asi. Ahora no solo tendre que buscar nuevos rodamientos, tambien tendre que remplazar la pieza que monte porque no se pueden retirar.Mal Control de Calidad. Cuidado

these bearing is so good for DIY and value for the money i buy again when i need more