SMR84
SMR Series Stainless Steel Miniature Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
SMR84
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
0.39 g
Tolerance class
ABEC1
Seal type
Open
For load direction
Radial
Main Dimensions
Bore diameter
4 mm
Bore diameter tolerance
-0.008mm to 0
Outside diameter
8 mm
Outside diameter tolerance
-0.008mm to 0
Width
2 mm
Width tolerance
-0.12mm to 0
Inner Ring Dimensions
Inner ring type
Standard
Ball & Washer Dimensions
Ball diameter
1.2 mm
Ball quantity
7
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
68 lbf
Radial static load rating
23 lbf
Limiting speed
50.4 X 1000 rpm
Lubrication
Required
Radial internal clearance
0.002mm to 0.013mm
Radial internal clearance
MC3
Materials
Ring material
Stainless Steel
Ball material
Stainless Steel
Cage material
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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SMR84 Bearing Product Overview & Core Advantages
The SMR84 is a metric miniature deep groove ball bearing engineered for precision applications requiring compact design and reliable performance. Constructed entirely from stainless steel, this single row, open bearing is optimized for radial loads and offers excellent corrosion resistance. Its small footprint, with a 4mm bore and 8mm outside diameter, makes it ideal for space-constrained assemblies in high-precision instruments and devices demanding consistent operation.
SMR84 Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| SMR | Manufacturer series designation for miniature deep groove ball bearings. |
| 84 | Specifies the core dimensions: 4mm bore, 8mm outside diameter, 2mm width. |
| Open (No Seal Code) | Indicates the bearing is unsealed, allowing for higher limiting speeds and custom lubrication options. |
SMR84 Bearing Structural Features & Performance Benefits
- High Precision & Smooth Operation: Manufactured to ABEC1 tolerance standards with a stainless steel cage and 7 precision balls, ensuring low noise and vibration for sensitive applications.
- Corrosion Resistance: The all-stainless steel construction (rings, balls, cage) provides excellent protection in humid or corrosive environments, compliant with ROHS and REACH.
- Optimized for High Speeds: The open design and precision engineering contribute to a high limiting speed of 50,400 rpm, suitable for demanding high-speed applications.
- Radial Load Capacity: With a dynamic load rating of 68 lbf and static load rating of 23 lbf, it provides reliable support for radial forces in compact designs.
- Controlled Internal Clearance: Features an MC3 radial internal clearance (0.002mm to 0.013mm), balancing operational smoothness and thermal expansion management.
SMR84 Bearing Typical Application Areas
This bearing is ideally suited for:
- Precision Instruments: Optical encoders, measuring devices, and laboratory equipment.
- Small Motors and Gearboxes: Servo motors, miniature DC motors, and precision gear mechanisms.
- Office Automation Equipment: Printers, scanners, and copiers.
- Medical Devices: Small handheld surgical tools and diagnostic equipment.
- Robotics and RC Models: Joints, drives, and small actuators requiring smooth, reliable rotation.
