SMR74
SMR Series Stainless Steel Miniature Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
SMR74
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
0.23 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
7 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 mm
Ball quantity
8
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
54 lbf
Radial static load rating
19 lbf
Limiting speed
54 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
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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SMR74 Bearing Product Overview & Core Advantages
The SMR74 is a precision miniature ball bearing designed for applications demanding compact size and reliable performance. As a single row deep groove ball bearing, it excels at handling radial loads efficiently. Constructed entirely from stainless steel, it offers excellent corrosion resistance. Its compact dimensions of 4mm bore, 7mm outside diameter, and 2mm width make it ideal for space-constrained, high-precision mechanisms requiring smooth operation and long service life.
SMR74 Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| SMR | Manufacturer series designation for miniature metric bearings. |
| 74 | Specifies the bearing size: 4mm bore, 7mm OD, 2mm width. |
| Open (Seal Type) | No built-in seals or shields, allowing for higher limiting speeds but requiring a clean operating environment or external sealing. |
| MC3 | Specifies a greater than normal radial internal clearance (0.002mm to 0.013mm), suitable for applications with significant thermal expansion or where interference fits are used. |
| ABEC1 | Defines the precision tolerance class, indicating standard precision suitable for a wide range of general applications. |
SMR74 Bearing Structural Features & Performance Benefits
- All-Stainless-Steel Construction: The rings, balls, and cage are made of stainless steel, providing superior corrosion resistance and making the bearing suitable for harsh environments and washdown applications.
- Deep Groove Raceway: The geometry of the raceway enables the bearing to handle not only radial loads but also moderate axial loads in both directions.
- Optimized for High Speed: The open design, combined with a stainless steel cage and eight precision balls, allows for a high limiting speed of 54,000 rpm, making it an excellent high-speed bearing for miniature applications.
- MC3 Internal Clearance: The specified radial internal clearance provides operational stability in applications prone to thermal gradients or where tight fits are employed on the shaft and housing.
- Lightweight & Compact: Weighing only 0.23 grams, the bearing minimizes inertia and is perfect for sensitive, lightweight mechanisms.
SMR74 Bearing Typical Application Areas
- Small Precision Motors: Used in stepper motors, DC micromotors, and spindle motors.
- Medical and Dental Devices: Ideal for handheld surgical tools, dental handpieces, and pump drives.
- Office Automation Equipment: Found in scanners, printers, and small fans.
- Robotics and RC Models: Used in miniature joints, gearboxes, and drone motors.
- Instrumentation and Gauges: Supports rotating components in precision measuring devices.
