10-Pack 4x9mm Open Bearings 4x9x2.5mm Miniature
UPC: 00193019046449
Type: Deep groove ball bearings
Closures: Open
Quantity: 10 Bearings
Dynamic load rating Cr: 640 N
Ball Bearings 4mm x 9mm x 2.5mm
✔️ Lot of 10 - Open Type, Chrome Steel, High RPM
This 10-pack of 4x9x2.5mm deep groove ball bearings is made from 52100 chrome steel and built for lightweight, high-speed applications like RC cars, trucks, and precision instruments. These open-style bearings come packed in a plastic tube for clean storage and fast access.
✅ Pack size: 10 bearings
✅ Inner diameter: 4mm
✅ Outer diameter: 9mm
✅ Width: 2.5mm
✅ Material: 52100 chrome steel
✅ Closure type: Open (no seals or shields)
✅ Dynamic load rating: 640 N
✅ Static load rating: 230 N
✅ Max speed (grease): 59,000 RPM
✅ Max speed (oil): 70,000 RPM
✅ Packing: Tube of 10 bearings
✅ Equal to: 618/4
Dimension Table:
| ID (d) | OD (D) | Width (B) | Cr (N) | Cor (N) | Grease RPM | Oil RPM |
|---|---|---|---|---|---|---|
| 4mm | 9mm | 2.5mm | 640 | 230 | 59,000 | 70,000 |
💡 Why choose open ball bearings for RC or lightweight builds?
Open bearings spin faster and are easier to clean:
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Minimal friction for max speed in small mechanisms
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Easy to clean and relube for hobby maintenance
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Perfect for low-load, high-RPM applications
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Common in RC cars, mini motors, and lightweight assemblies
Keep your builds fast, smooth, and low-drag, grab this 10-pack and get your gear rolling!