MR137
MR Series Miniature Bearings
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Basic Information
Main Dimensions
Inner Ring Dimensions
Ball & Washer Dimensions
Performance
Materials
Environment & Compliance
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MR137 Bearing Product Overview & Core Advantages
The MR137 is a metric single row deep groove ball bearing designed for compact applications requiring reliable radial load support. This open-type bearing features standard Chrome Steel construction and delivers stable performance in general-purpose machinery. Its miniature dimensions (7mm bore, 13mm OD, 3mm width) and ABEC1 precision class make it ideal for space-constrained assemblies where consistent rotational accuracy is essential.
Model Code Technical Breakdown
| Code Segment | Technical Meaning | Performance Implication |
|---|---|---|
| MR137 | Basic bearing designation | Defines core dimensions: 7mm bore, 13mm OD, 3mm width |
| Open (No seal) | No contact seals | Enables higher limiting speed (40,000 rpm); requires external lubrication |
| MC3 clearance | Radial internal clearance group | 0.002-0.013mm range ensures optimal fit for general operating conditions |
MR137 Bearing Structural Features & Performance Benefits
Optimized Single Row Design: The deep groove raceway and 12 precision chrome steel balls provide excellent radial load capacity (104 lbf dynamic / 50 lbf static) while maintaining smooth operation.
High-Speed Capability: The stainless steel cage and open construction enable a limiting speed of 40,000 rpm, making it suitable for high-rotation applications.
Precision Engineering: Manufactured to ABEC1 tolerance class with tight dimensional controls (bore/OD tolerance: -0.008mm to 0), ensuring consistent performance in precision mechanisms.
Material Excellence: Chrome Steel rings and balls combined with stainless steel cage provide durability and corrosion resistance within the operating temperature range of -30°C to 110°C.
MR137 Bearing Typical Application Areas
- Small electric motors and miniature DC motors
- Precision instruments and measurement devices
- Office automation equipment including printers and scanners
- Medical devices and laboratory equipment
- Robotic joints and small mechanical assemblies
- Consumer electronics requiring miniature bearing solutions
