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The MR Series Ball Bearings are a comprehensive line of miniature deep groove ball bearings, precision-engineered for high-speed performance in compact applications. Designed for micro motors, robotics, medical instruments, and precision devices, these bearings offer versatile sealing and lubrication options to meet specific operational demands.
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The MR Series Ball Bearings represent the pinnacle of miniature rotational engineering, meticulously crafted to transform how compact mechanisms operate. When you hold one of these bearings, the substantial tactile weight of the high-carbon chrome steel immediately conveys a sense of industrial-grade durability, while the flawlessly polished raceways reflect a commitment to uncompromising craftsmanship. In operation, they emit a barely perceptible, smooth aerodynamic hum—a testament to the optimized internal geometry that drastically reduces friction and mechanical resonance. Instead of merely acting as a basic pivot point, these bearings actively enhance the lifespan and efficiency of your proprietary machinery. By integrating these ultra-precise components into your assemblies, you eliminate the frustrating downtime associated with premature mechanical wear and thermal overload. The seamless rotation ensures that your micro-motors and robotics actuators perform with absolute fluidity, translating to lower energy consumption and a significantly elevated end-user experience. Every rotation speaks to the rigorous metallurgical standards and exacting tolerances that define our manufacturing process, ensuring your critical equipment runs cooler, quieter, and remarkably longer.
Selecting the exact dimensions and load capacities is critical for seamless mechanical integration. The following matrix outlines the precise physical and mechanical parameters of our MR Series. These specifications are strictly monitored during the manufacturing process to guarantee absolute batch-to-batch consistency for your engineering requirements.
Model | Bore (d) | Outer Dia (D) | Width (B) | Max Speed (RPM) | Load (Dynamic / Static) | Typical Applications |
|---|---|---|---|---|---|---|
MR91x | 4–9 mm | 9–17 mm | 4–7 mm | 20,000–35,000 | 0.3–1.5 kN / 0.15–0.7 kN | Micro motors, small robotics, precision instruments |
MR923 | 11 mm | 23 mm | 8 mm | ~34,000 | 1.8 kN / 0.85 kN | Micro motors, robotics actuators, medical devices |
MR913 | 13 mm | 30 mm | 9 mm | ~28,000 | 2.5 kN / 1.2 kN | Precision servo drives, small office automation |
MR137 | 7 mm | 13 mm | 5 mm | ~35,000 | 0.75 kN / 0.35 kN | Micro motors, precision robotics, consumer electronics |
All models are available in Open, ZZ (metal shield), and 2RS (rubber seal) variants. Precision grades: ABEC-1 / ABEC-3 / ABEC-5.
To further accommodate your specific operational environments, the MR Series is available with the following highly configurable parameters:
Precision Grades: ABEC-1 / ABEC-3 / ABEC-5
Seal / Shield Types: Open, ZZ (Metal Shield), 2RS (Rubber Seal)
Internal Clearance: C0 / C2 / C3
Materials: Chrome steel (GCr15), Stainless Steel, Specialty alloys
Lubrication Options: High-speed grease, Long-life grease, High-temperature grease, Oil-lubricated
Elevate your mechanical assemblies with miniature bearings designed to overcome the most demanding operational constraints. Our MR series is engineered not just to meet industry standards, but to redefine reliability in tight spaces, ensuring your final product outperforms expectations.
Space-Optimized Architecture: The ultra-compact footprint allows your design engineers to shrink the overall size of devices without sacrificing load-bearing capabilities or structural integrity.
Acoustic Excellence: Crafted with ABEC-rated precision, these bearings operate with a whisper-quiet acoustic profile, which is absolutely crucial for medical and office environments where noise reduction is paramount.
Thermal Stability: The advanced metallurgical composition ensures that even under continuous, high-speed rotation, the bearings dissipate heat efficiently, preventing catastrophic thermal expansion.
Frictionless Fluidity: Polished to mirror-like finishes, the internal raceways guarantee a buttery-smooth tactile rotation that drastically reduces energy loss in battery-operated equipment.
Defensive Shielding: Whether facing abrasive dust or moisture, the versatile sealing configurations act as an impenetrable fortress, safeguarding the internal rolling elements and extending operational life.
Navigating the complexities of mechanical design requires precise dimensional data and predictable performance metrics. We provide a comprehensive and meticulously structured selection matrix covering models like the MR91x, MR923, MR913, and MR137. This empowers your engineering teams to rapidly identify the exact bore, outer diameter, and width required for highly constrained spatial envelopes.
Accelerate your prototyping phase with clearly defined dynamic and static load capacities ranging up to 2.5 kN.
Confidently match RPM thresholds (up to 35,000 RPM) with your specific micro-motor or robotic actuator requirements.
Eliminate guesswork in procurement by utilizing our standardized dimensional charts for precise integration into your housings.
Streamline your supply chain by selecting from a scalable matrix designed specifically for diverse industrial applications.
The foundation of any reliable rotational component lies in its metallurgical integrity. We utilize premium high-carbon chrome bearing steel (GCr15) and marine-grade stainless steel to forge components that withstand punishing industrial environments. The tactile weight and visual luster of these metals are immediate indicators of their superior density and structural soundness.
High-Carbon Chrome Steel (GCr15): Delivers exceptional surface hardness and wear resistance, ensuring longevity in continuous-duty mechanical systems.
Stainless Steel Variants: Provides an impervious defense against corrosive agents, making them indispensable for fluid-handling or high-humidity environments.
Specialty Alloys: Readily available for extreme-condition deployments where standard metals might experience premature fatigue or deformation.
Micro-Structural Integrity: Advanced heat treatment processes lock in durability, preventing premature spalling or micro-cracking under heavy dynamic loads.
When your equipment operates at the extreme edge of velocity, precision is not optional—it is critical. Calibrated to ABEC-1, ABEC-3, and ABEC-5 standards, these bearings feature flawlessly engineered ball and raceway geometries. This exactness translates into a vibration-free, harmonious rotation that protects adjacent sensitive electronics from disruptive mechanical resonance.
Sustain extreme speeds up to 35,000 RPM without experiencing the destructive chatter common in lesser components.
Protect delicate servo drives and precision instruments with ultra-low runout and superior rotational concentricity.
Experience the auditory difference of ABEC-5 grading, which transforms mechanical grinding into a smooth, aerodynamic hum.
Enhance the positioning accuracy of robotic arms through minimized internal friction and strict dimensional tolerances.
Environmental contamination and improper lubrication are the primary adversaries of bearing longevity. Our comprehensive defensive configurations ensure that your rotational components remain pristine and perfectly lubricated, regardless of the external operating conditions your machinery faces.
Open Configuration: Ideal for sealed, oil-bath environments where maximum speed and absolute zero seal friction are required.
ZZ Metal Shields: Deploy robust metallic barriers to deflect particulate matter and debris without compromising high-speed capabilities.
2RS Rubber Seals: Create an airtight, watertight fortress around the rolling elements, perfect for environments exposed to moisture or fine dust.
Custom Tribology: Choose from high-speed, long-life, or high-temperature greases, or opt for specialized oil lubrication to perfectly match your thermal and kinetic demands.
The true value of a precision bearing is proven in its real-world application. The MR Series is deeply integrated into the architecture of modern automation and miniaturized technology, reflecting decades of engineering refinement. By utilizing these bearings, you instantly upgrade the reliability and market perception of your end products.
Micro & Servo Motors: Provide the frictionless foundation necessary for rapid acceleration and precise torque delivery.
Robotic Joints & Actuators: Ensure the smooth, stutter-free articulation required for high-precision automated assembly lines.
Medical Instruments: Meet the stringent hygiene and low-noise requirements essential for laboratory centrifuges and surgical tools.
Office Automation: Eradicate the annoying squeaks and paper jams in printers and scanners through consistent, reliable rotation.
Consumer Electronics: Enable the miniaturization of high-end gadgets by fitting immense load capacity into microscopic spatial footprints.
Off-the-shelf solutions rarely satisfy the nuanced demands of proprietary industrial designs. We act as an extension of your engineering department, offering deep customization capabilities that align perfectly with your brand's unique specifications. From internal clearances to external branding, we tailor every aspect of the bearing to fit your vision.
Internal Clearance Tuning: Specify C0, C2, or C3 clearances to accommodate specific thermal expansion rates and operational fits.
Precision Laser Marking: Engrave your proprietary part numbers or logos directly onto the metal shields for seamless brand integration.
Private Label Packaging: Receive components in custom-designed packaging that drops directly into your distribution network without repackaging.
Performance Verification: Leverage our testing facilities for rigorous sample validation before committing to mass production.
In today’s volatile manufacturing landscape, a component is only as good as the supply chain that delivers it. Operating as a direct-source manufacturer, we eliminate intermediary markups and communication bottlenecks. You gain direct access to our metallurgical experts and logistics coordinators, ensuring your production lines never halt.
Scalable Production: Seamlessly transition from small-batch prototyping to massive volume runs without experiencing quality degradation.
Cost-Efficiency: Leverage our factory-direct pricing model to significantly improve the profit margins of your final assemblies.
Engineering Consultation: Partner with our technical team for expert advice on load calculations, lifespan predictions, and integration strategies.
Reliable Fulfillment: Depend on our optimized inventory management and global logistics network for strictly punctual deliveries.
Securing a dependable source for precision rotational components is a strategic advantage for your assembly lines. We do not just manufacture metal parts; we engineer reliability, ensuring that every bearing we produce acts as a catalyst for your operational success. Our commitment to excellence is visible in the flawless finish of our products and the unwavering support we provide to your procurement teams.
Uncompromising Quality Control: Every single unit undergoes rigorous acoustic, dimensional, and visual inspections before it ever leaves our facility.
Decades of Domain Expertise: We bring profound metallurgical and mechanical knowledge to the table, solving complex rotational challenges effortlessly.
Rapid Prototyping Capabilities: Accelerate your time-to-market with our agile manufacturing cells dedicated to quick-turn custom samples.
Sustainable Manufacturing Practices: We employ eco-conscious production methods, reducing waste and ensuring compliance with global environmental standards.
Dedicated Account Management: Experience frictionless communication with a dedicated liaison who understands your unique technical and commercial requirements.
The ABEC rating directly correlates with the dimensional accuracy and runout of the bearing. Higher grades like ABEC-5 ensure significantly tighter tolerances, which drastically minimizes eccentric rotation. In high-speed servo motors, this translates to reduced vibration, lower heat generation, and highly precise angular positioning, even when operating near the maximum threshold of 35,000 RPM.
GCr15 high-carbon chrome steel offers superior surface hardness and exceptional fatigue strength compared to standard stainless steel. This makes it the optimal choice for applications requiring maximum load-bearing capacity and wear resistance in continuous, high-stress environments. However, if your machinery operates in environments exposed to moisture or corrosive chemicals, our stainless steel variants remain the necessary and highly effective alternative.
Absolutely. We highly recommend specifying a C3 internal clearance for applications where the bearing will experience significant temperature gradients. The increased radial play accommodates the thermal expansion of the inner ring and rolling elements, preventing the bearing from seizing up and ensuring smooth, uninterrupted operation under high heat conditions.
The 2RS rubber seals provide superior protection against fine dust and moisture by making physical contact with the inner ring. However, this contact creates slight friction, which marginally reduces the maximum achievable RPM and generates a small amount of heat. For absolute maximum speeds where contamination is less of a concern, the non-contact ZZ metal shields are the preferred and most efficient configuration.
Yes, we offer a comprehensive range of custom tribology solutions tailored to your exact specifications. For sensitive environments like medical devices or vacuum applications, we can pre-lubricate the bearings with specialized, low-outgassing, and biocompatible synthetic greases. This ensures total compliance with strict industry health regulations while maintaining optimal rotational fluidity and longevity.
