Attributes

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

5 reviews

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.

5 FAQ

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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