Attributes

Brand	-
Category	Industrial Small Parts / Bearings & Bushings
Origin	-
Material	440C Stainless Steel
Shield Type	ZZ (Double Metal Shield)
Precision Rating	ABEC-5
Lubrication	Pre-greased
Cage Material	Steel
Noise Level	Low Noise (Z1)
Operating Temperature	-20°C to 120°C
Hardness	HRC 58-60
Package Quantity	10 Pieces
Common Applications	Drones, RC Cars, Fishing Reels

5 reviews

Anonymous

Apr 18, 2026

Rating: 5/5

Exact dimensions

Measured with calipers. The SMR138ZZ specs are accurate.

Anonymous

Apr 15, 2026

Rating: 5/5

Smooth operation

These bearings fit perfectly in my drone motors. Very smooth spin.

Anonymous

Apr 03, 2026

Rating: 4/5

Fast shipping

Product arrived quickly. Bearings work well in my RC car differential.

Anonymous

Feb 24, 2026

Rating: 4/5

Good value

Quality is good for the price. One bearing was slightly stiff but others were great.

Anonymous

Feb 15, 2026

Rating: 5/5

Resistant to rust

Used them in a fishing reel modification. No signs of corrosion after months.

5 FAQ

Q: Can I use these in water?

A: They are stainless steel and resist corrosion, but ZZ shields are not waterproof.

Q: What grease is used inside?

A: They come pre-lubricated with standard bearing grease suitable for general use.

Q: Are these bearings sealed or shielded?

A: These are ZZ shielded, meaning they have metal shields on both sides.

Q: Do you sell single pieces?

A: Currently, these are sold in packs of 10 pieces only.

Q: What are the dimensions for SMR138ZZ?

A: The SMR138ZZ has a bore of 3mm, OD of 8mm, and width of 4mm.

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