Description
Reviews
| Brand | - |
| Category | Industrial Small Parts / Bearings & Bushings |
| Origin | - |
| Brand | NMB (MinebeaMitsumi) |
| Model Series | R-3HH / R-4HH |
| Material | Chrome Steel (SAE 52100) |
| Shield Type | Metal Shield (ZZ) |
| R-3HH Inner Diameter | 3/16 inch (4.762 mm) |
| R-3HH Outer Diameter | 3/8 inch (9.525 mm) |
| R-4HH Inner Diameter | 1/4 inch (6.350 mm) |
| R-4HH Outer Diameter | 1/2 inch (12.700 mm) |
| Precision Rating | ABEC-7 / ISO Class 4 |
| Country of Origin | Japan |
Anonymous
Apr 14, 2026
Rating: 4/5
Great quality but pricey
You definitely pay for the Japanese manufacturing. Performance is top-notch, but there are cheaper options if you are on a budget.
Anonymous
Apr 08, 2026
Rating: 3/5
One bearing was noisy
Out of the pack I ordered, one bearing had a slight grit feeling when spun. The rest were fine. Maybe just bad luck.
Anonymous
Mar 13, 2026
Rating: 5/5
Smooth operation
Used these for a small spindle project. The runout is minimal. Highly recommended for precision applications.
Anonymous
Mar 08, 2026
Rating: 5/5
Excellent precision
Fitment was exact on my imperial shafts. No play whatsoever. They handle high speeds without overheating.
Anonymous
Mar 05, 2026
Rating: 5/5
Perfect for high RPM motors
These bearings are incredibly smooth. I used them in my modified RC motor and the difference in noise level is significant. Genuine NMB quality.
Q: What is the difference between HH and standard series?
A: The HH designation indicates a high-speed grade with tighter tolerances and optimized internal clearance.
Q: Are these suitable for wet environments?
A: These feature metal shields rather than rubber seals. They are not recommended for submerged or very wet conditions.
Q: Can I mix R-3 and R-4 in one order?
A: Please select the specific size variant from the dropdown menu. Bulk mixes can be arranged by contacting us directly.
Q: Are these bearings pre-lubricated?
A: Yes, they come pre-lubricated with light oil suitable for high-speed applications.
Q: Do you guarantee these are genuine NMB?
A: Yes, all our bearings are sourced directly from authorized distributors and are 100% genuine.
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