SMR128zz
SMR Series Stainless Steel Miniature Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
SMR128zz
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
0.99 g
Tolerance class
ABEC1
Seal type
Shielded
For load direction
Radial
Main Dimensions
Bore diameter
8 mm
Bore diameter tolerance
-0.008mm to 0
Outside diameter
12 mm
Outside diameter tolerance
-0.008mm to 0
Width
3.5 mm
Width tolerance
-0.12mm to 0
Inner Ring Dimensions
Inner ring type
Standard
Ball & Washer Dimensions
Ball diameter
1.2 mm
Ball quantity
12
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
94 lbf
Radial static load rating
44 lbf
Limiting speed
36 X 1000 rpm
Lubrication
Required
Radial internal clearance
MC3
Radial internal clearance
0.002mm to 0.013mm
Materials
Ring material
Stainless Steel
Ball material
Stainless Steel
Cage material
Stainless Steel
Shield material
300 Series Stainless Steel
Environment & Compliance
REACH
Compliant
ROHS
Compliant
Technical Drawings
No drawings available at the moment, will be launched soon
Price:
$ 1.35
/ each
In Stock
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SMR128zz Bearing Product Overview & Core Advantages
The SMR128zz is a miniature deep groove ball bearing engineered for precision applications requiring compact design and reliable performance. Constructed entirely from stainless steel, this shielded bearing offers excellent corrosion resistance. Its primary function is to support radial loads efficiently while operating at moderate speeds. The combination of a compact 8mm bore, 12mm outside diameter, and a slim 3.5mm width makes it an ideal solution for space-constrained, high-precision assemblies demanding long-term reliability and consistent operation.
SMR128zz Bearing Model Code Explained, Specifications & Naming Convention
The model number SMR128zz breaks down as follows:
- SMR: Indicates a series of miniature, deep groove ball bearings.
- 128: Specifies the bore diameter code, corresponding to an 8 mm bore.
- zz: Denotes that the bearing is equipped with non-contact shields (ZZ) on both sides. These shields protect the internal components from large particulate contaminants while minimizing friction, contributing to the bearing's limiting speed.
SMR128zz Bearing Structural Features & Performance Benefits
- Robust Construction: Manufactured with stainless steel rings, balls, and cage, the bearing provides superior corrosion resistance and durability in demanding environments.
- Optimized Load Capacity: The deep groove raceway and 12-ball complement are designed to handle the specified radial dynamic load rating of 94 lbf effectively.
- Shielded Protection: The non-contact stainless steel shields (zz) help retain lubricant and exclude contaminants, enhancing bearing life without significantly increasing torque.
- Precision Performance: Built to ABEC1 tolerance class with a controlled MC3 radial internal clearance (0.002mm to 0.013mm), ensuring smooth and consistent operation.
SMR128zz Bearing Typical Application Areas
This bearing is commonly specified in:
- Small Precision Motors (e.g., stepper motors, coreless motors)
- Medical and Dental Handpieces
- Optical Encoders and Precision Instruments
- Office Automation Equipment (printers, scanners)
- Radio-Control Models and Small Gearboxes
