R4-2RS Miniature Ball Bearings 1/4 inch x 5/8 inch x 0.196 inch (20 Pack), Double Rubber Sealed Chrome Steel, Pre-Lubricated, for 3D Printers, RC Vehicles & Hobby Projects
Condition: New
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Availability:
Only 10 left in stock, order soon!
Arrives
Sunday, Aug 9
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Features
- R4-2RS Miniature Bearing: 1/4 inch bore x 5/8 inch OD x 0.196 inch width. Double rubber seals (2RS) on both sides. 20 bearings in the pack. Fits 3D printers, RC cars, and small hobby equipment.
- Double Rubber Sealed, Pre-Lubricated: 2RS rubber seals press directly against the inner ring, locking in factory grease and standing up to workshop dust. Arrives ready to install.
- Chrome Steel, Precision Ground for Smooth Rotation: Tight tolerances ensure consistent, low-noise spin for 3D printers running overnight or RC vehicles at full throttle.
- Standard R4 Imperial Size: If your old bearing reads R4-2RS or R4RS, confirm dimensions and this drops right in. Not to be confused with metric miniature bearings.
- 20 Pack: RC cars and 3D printers use multiple R4 bearings. With 20 in the pack, you are covered for a full build plus spares for the next project.
Brand: Donepart
Material: Alloy Steel
Item dimensions L x W x H: 0.25 x 0.2 inches
Bearing Number: R4-2RS
Item Thickness: 0.2 Inches
Brand Name: Donepart
Bearing Number: R4-2RS
Bearing Type: Ball Bearing
Part Number: R4-2rs
Manufacturer: Donepart
Included Components: Donepart Bearings 20-Pack R4-2RS
Item Dimensions: 0.25 x 0.2 inches
Item Thickness: 0.2 Inches
Outside Diameter: 5/8 Inches
Material Type: Alloy Steel
Compatible Lubricant: Grease
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Sunday, Aug 9
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Works perfect and smooth.
Reviewed in the United States on January 21, 2026 by James E Rasmussen
These were the exact replacement bearings for my project
Reviewed in the United States on December 5, 2025 by Raoul Jeanneret
Size is small but it will work. For the value and cost, it will function as needed. It spins well.
Reviewed in the United States on September 4, 2025 by Daryl Jones
These were great for model airplanes for wind dejection on the prop
Reviewed in the United States on September 25, 2025 by Jane
Smooth rolling. The size is as expected.
Reviewed in the United States on April 20, 2025 by GingerNerd
I use a roller bearings from time to time in my 3D printing projects. It's the perfect solution if you want/need a wheel or pulley that turns smoothly. You just print a cavity into which bearing fits with a solid friction fit and you are rolling (both literally and metaphorically). I don't have a project at the moment for which I am planning to use these, but I did check them out. No quality issues were found. They spec out consistantly and they turn very smoothly. They are smaller than what I typically use but actually opens up some applications for which the larger ones were unsuitable. Obviously, if I encounter any issues as I put these into use, I will amend my review, but frankly, based on my examination of them, I very much doubt that there will be any issues.
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Reviewed in the United States on January 7, 2025 by JThayer
There are 3 main types of bearings for RC cars. Unshielded, shielded and sealed. Most RC cars come with shielded bearings (hobby grade at least), but the king of durability and performance are the sealed bearings. Water and debris can kill unshielded bearings pretty quickly if you get them too dirty, run em through mud or water. Shield are a lot better because they will keep a lot of the debris out, but not the smaller stuff and not the mud/water. These are sealed to keep all of that junk out so the bearings will perform better for longer and the bearings will last a lot longer. If you are swapping bearings do yourself a favor and spend an extra buck or two and get good ones like these.
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Reviewed in the United States on January 16, 2025 by JohnsonFamily
I got these for an upcoming science project involving a solar-to-wind powered model car using these bearings as part of low-friction wheels. They come in cylindrical storage containers (10 per container) which is great for protecting the unused ones from dust and moisture when in storage for future projects. I measured 0.625” OD and 0.2485” ID and 0.1960” wide on a bearing picked at random. I didn’t see any tolerance specifications in the Amazon description and no documentation came with the bearings. They look nicely built and when I put a 1/4” plastic rod in one, it rotated smoothly and didn’t notice any obvious “slop” in the bearing. Can’t wait to build my project!
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Reviewed in the United States on January 9, 2025 Reviewed in the United States on January 9, 2025 by Amazon reviewer