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.
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This item: JIUWU 693ZZ R-830ZZ Sealed Deep Groove Ball Bearings 3x8x4mm Steel, 10 Pack for Skateboard Wheels, Scooters, Rollerblades, RC Cars, Small Motors and DIY Applications
EUR6.45
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EUR7.64
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EUR19.54
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Product description
From the brand
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We have carbide drills, face milling cutter sets, deep groove ball miniature rolling bearings, RC wheel tyres, screws furniture screws, flat head aluminium rivet nuts, sensors Load Cell Sensor for Electronic and other furniture hardware products.
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Furniture Hardware Products
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Furniture Hardware Products
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RC Tire Wheel
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Customers say
Customers find these bearings to be of good quality, working well for small projects, and being well-made for their price. They fit perfectly, particularly in brushless motors, and have correct dimensions. Customers disagree on the bearings' smoothness and spinning performance. The sealing feature receives mixed feedback, with several customers noting they are not sealed.
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44 customers mention quality, 39 positive, 5 negative
Good quality fast shipping. Not suitable for water though as not a sealed bearingRead more
Good Bearings, Smooth and Clean, good tolerances. I highly recommend them.Read more
Great quality. Fit my application in 3D printed parts. I used digital calipers on these, dimensions are spot onRead more
Quality ISK bearings. They come slightly greased (not too much or too little) and ready to use....Read more
35 customers mention performance, 32 positive, 3 negative
19 customers mention value for money, 19 positive, 0 negative
Great bearings for the price. I had a small project that needed specific size bearings and these fit perfectly....Read more
...Running almost silent and true again on this 11 year old tool! Great price and working perfectly... now what to do with the extra bearings?Read more
...It fit fine and was pretty inexpensive even in a pack of 10. I haven't run the motor, yet, but I'm pretty sure it will hold up okRead more
Dimensionally accurate, decent bearings for the price. Being used with no load.Read more
18 customers mention measurement size, 14 positive, 4 negative
Dimensionally accurate, decent bearings for the price. Being used with no load.Read more
...is wondering, these 3x8x4 mm bearings are the correct size for the Bambulab extruder gear. They fit perfectly and work smoothly without any issues....Read more
...start making noise and these bearings wound up being the right size to fix that fan too. Serendipity!!...Read more
These do not have a 4mm inner diameter. they are marked incorrectly.Read more
15 customers mention fit, 14 positive, 1 negative
...They fit perfectly and work smoothly without any issues. A great value pack for anyone needing replacements or spares!Read more
I only needed one to repair a brushless RC motor. It fit fine and was pretty inexpensive even in a pack of 10....Read more
Bought theses for a DJI Phantom drone fc40 and they fit perfect in the brushless motorsRead more
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...Read more
10 customers mention smoothness, 6 positive, 4 negative
Bearings themselves are nice and smooth, but the design (seal) interferes with the precision shims for the v-wheels....Read more
...One had a crunched seal/shield and another just flat felt gritty....Read more
Bearings were good, very smoothRead more
3 of the 10 bearings were gritty and didn't spin freely.Read more
9 customers mention sealing, 4 positive, 5 negative
Good quality fast shipping. Not suitable for water though as not a sealed bearingRead more
...These are perfect to keep from rubbing against the plastic.Read more
...One had a crunched seal/shield and another just flat felt gritty....Read more
...I also like how they are sealed on both sides versus the previous one's I had that were susceptible to getting gunked with dirt, metal fragments,...Read more
9 customers mention spinning, 6 positive, 3 negative
...They are on tolerance, were cleaned properly of metal grit, and spin freely.Read more
While these may work for certain applications they do not spin freely. Too much resistance.Read more
Economy grade. I received mine all in good condition, they turn freely, no resistance or roughness....Read more
...It can still spin with applied force, but it will stop spinning immediately when no force is acting on it, meaning there is internal friction...Read more
Bearings are just right for small project
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.
Top reviews from the United States
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- Reviewed in the United States on December 4, 2024Size: 3x6x2.5mmNumber of Items: 10Verified Purchase
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.
Images in this review
- Reviewed in the United States on February 22, 2021Size: 5x11x5mmNumber of Items: 10Verified Purchase
- Reviewed in the United States on October 23, 2023Size: 7x19x6mmNumber of Items: 10Verified Purchase
With a little effort I was able to replace the front bearing on my Black and decker rotary tool with this. Running almost silent and true again on this 11 year old tool!
Great price and working perfectly... now what to do with the extra bearings?
Images in this review
Top reviews from other countries
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Chris55Reviewed in Canada on March 18, 2026
conforme à mes attentes
Size: 4x12x4mmNumber of Items: 10Verified Purchase -
Charles drouinReviewed in Canada on January 6, 2026
Bearings abordable
Size: 6x15x5mmNumber of Items: 10Verified Purchase - MickReviewed in Canada on October 19, 2025
Precision dimensions
Size: 3x8x3mmNumber of Items: 10Verified Purchase - Samuel cormierReviewed in Canada on November 11, 2022
Actual inner dimensions is 2.81 mm not 3mm
Size: 3x8x3mmNumber of Items: 10Verified Purchase -
Chris55Reviewed in Canada on January 17, 2026
conforme à mes attentes
Size: 6x15x5mmNumber of Items: 10Verified Purchase
