Metric MR Series Bearing Steel Bearings Manufacturers

What the Metric MR Series Covers

The Metric MR Series sits within our Bearing Steel Bearings category under Deep Groove Ball Bearings. The MR designation follows the established metric miniature bearing naming system, and the series is grouped alongside the Inch R Series, Thin-Section Series, and Metric Miniature Series.

The range currently includes three series: MR10, MR11, and MR12. Each series is available in multiple bore, outer diameter, and width combinations within the MR designation framework. We configure each bearing around the specific working point of the application rather than offering a generic off-the-shelf product.

Product Range: MR10, MR11, MR12

Each series is manufactured from bearing steel with controlled hardness and dimensional stability. We match internal clearance, cage type, and lubrication to the operating conditions of the customer's assembly. For applications requiring corrosion resistance, we offer stainless steel alternatives in our Stainless Steel Bearings category.

Application Fit

The Metric MR Series is used across a broad range of industries. Typical applications include electric motors, power tools, pneumatic tools, robotics, drones, household appliances, precision instruments, semiconductor equipment, medical devices, marine equipment, aerospace components, financial equipment, textile machinery, and fishing equipment.

The bearings are engineered for low noise, low vibration, low friction, high precision, and high-speed operation. For applications that require corrosion resistance or operation in aggressive environments, we offer stainless steel alternatives in our Stainless Steel Bearings category.

Material and Engineering Considerations

We manufacture the Metric MR Series from bearing steel, selected for its hardness, wear resistance, and dimensional stability under load. The material is processed through our automated production lines, which incorporate Japanese precision manufacturing technology to maintain tight tolerances on raceway geometry and ball complement.

For customers who need non-standard configurations, we can modify bearing structure, materials, and performance parameters. Our R&D team supports custom development based on drawings and samples, covering solution design, prototype production, mass delivery, and after-sales technical support.

Critical Specifications and Performance

• Low noise operation: 20–25 dB for quiet-running assemblies
• Low vibration and low friction torque for energy-efficient operation
• High precision running accuracy for consistent performance
• High-speed capability for demanding rotating applications
• Excellent sealing performance with multiple shield and seal options
• Long service life under proper lubrication and loading conditions

Configuration and Customization

We support OEM and ODM customization across the Metric MR Series. Our engineering team can adjust internal clearance, cage design, lubrication type, sealing arrangement, and material selection to match the application requirements.

• Bearing design and optimization
• Prototype production and testing
• Mass production and delivery
• Failure analysis and technical support

Quality Assurance and Testing

Our quality management system covers the entire production chain, from raw material warehousing through production processes to finished product delivery. We operate a closed-loop quality system with high-precision inspection and testing equipment.

Core performance parameters verified during testing include precision, noise, vibration, sealing, wear resistance, and corrosion resistance. Our certifications include IATF 16949, RoHS, CE, and SGS, which support supply into automotive, medical, semiconductor, and other regulated industries.

Installation and Maintenance Considerations

Proper installation is critical for the service life of miniature bearings. We provide mounting recommendations for shaft and housing fits, including tolerance classes and recommended press-fit procedures. For sealed bearings, no additional lubrication is required during installation. For open bearings, we specify the correct grease type and quantity based on operating speed and temperature.

Maintenance requirements are minimal for sealed Metric MR Series bearings. For open or shielded configurations, we recommend a relubrication schedule based on operating hours and environmental conditions. Our technical team can provide specific guidance for your application.

Information We Use to Configure Your Solution

To prepare an accurate configuration and quotation for the Metric MR Series, we use the following project information:

• Operating loads: radial, axial, and combined loads
• Speed range: expected RPM and duty cycle
• Operating temperature range
• Lubrication requirements: grease type, quantity, and relubrication interval
• Sealing or shielding preference
• Mounting arrangement and shaft/housing tolerances
• Noise and vibration limits
• Expected service life and reliability targets
• Environmental conditions: moisture, chemicals, particulates

Frequently Asked Questions