Donepart 684ZZ Small Bearings 4mm x 9mm x 4mm Double Shielded and Pre-Lubricated Deep Groove Ball Bearing (20 Pcs)

nice replacement bearing for my iflight Xing motors 2206- 2208 an 2306 motors I have. sure many more can use these . they seem to be very close if not the same bearings Xing is using.still looking maybe for ceramic bearings for my motors .it made a big difference in my rc trucks an I just have ceramic on my mind I curious lol,but these are enough so I stop even looking lol.just need to see if these bearings hold up.

Have not used them long term or anything. Just an initial review. My use case is light though, not many rpms/load.

The bearings metal seal are a great choice of sealed bearing it keeps small debris out, the down size of the item is that there very small to do other than clocks, small fans, miniature hobbies vehicles, and outdoor pin wheels lawn accessories. Read the reviews of the quality of the bearing from "Donepart store" have said "at Donepart, "quality first, customer foremost." our goal is to contribute to the stable operation of global industrial equipment through our high-quality products and services". In the picture it looks big or medium size bearings the description said Donepart 684ZZ Small Bearings 4mm x 9mm x 4mm Double Shielded and Pre-Lubricated Deep Groove Ball Bearing (20 Pcs), the quantity is plenty, the pricing at the time of the purchase is good, the parts of the bearings. The reviews of the bearings have said, the parts of quality is at the question, the tolerance are loose to fit into most parts of other materials, rough in most conditions, the sounds is scratchy metals doesn't sit well in rolling or running motions.

They are roller bearing just what you need

The bore is 4mm rather than 5 and they will not fit the titan aero extruder or the genius or sidewinder x1 extruder. For the genius extruder you will need the 5x9x3 ball bearings 5mm bore 9 mm OD and 3 mm thickness. These are 4x9x4 so they are thicker by a mm and the bore is smaller by a mm. It was my error not knowing that they are not exactly the size I needed. Not sure on the qualityThe Bearing on the right or with the smaller inner diameter is the one listed. The other bearing is the bearing needed for titan aero or artillery genius / swx1Moreover the regular titan extruder take a larger bearing, FYI.