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The MR Series Miniature Bearings are precision-engineered for high-speed, compact applications in micro motors, robotics, and medical instruments. These versatile bearings offer customizable sealing, precision grades, and lubrication to meet specific performance requirements.
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In the demanding landscape of high-speed micro-mechanisms, every millimeter of internal space and every decibel of operational noise critically impacts the final user experience. The MR Miniature Bearings Series is meticulously engineered to solve the complex challenges of spatial constraints while delivering uncompromising rotational stability and longevity. When integrated into your precision assemblies, these bearings provide a seamless, whisper-quiet operation that instantly elevates the perceived and actual quality of your equipment. By utilizing advanced raceway geometries and highly refined surface finishes, these components significantly minimize internal friction and heat generation, ensuring your micro motors and robotic actuators run cooler during prolonged use. The tactile smoothness of the rotation translates directly into extended maintenance intervals, reducing costly downtime for the end-user. Designed to handle intense, continuous-duty cycles, this series empowers your engineering teams to push the boundaries of miniaturization without fearing premature mechanical failure. Whether subjected to the sterile, rigorous demands of medical instrumentation or the rapid, repetitive motions of office automation, these bearings maintain their structural integrity and performance consistency, ultimately safeguarding your brand's reputation for reliability.
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.
Achieving superior mechanical motion in confined spaces requires more than just scaling down standard components. Our MR series introduces targeted engineering advantages that directly improve your production outcomes and the operational lifespan of your products.
Ultra-Compact Architecture: Maximizes internal space within micro-devices, allowing your design engineers to reduce overall product weight and footprint without compromising structural strength.
Frictionless High-Speed Dynamics: Capable of sustaining up to 35,000 RPM, ensuring fluid, continuous operation that prevents motor burnout and minimizes energy waste.
Vibration-Dampening Accuracy: Manufactured to strict ABEC tolerances, significantly reducing acoustic output and harsh vibrations, which is critical for user comfort in handheld or sensitive equipment.
Corrosion-Resistant Integrity: Available in specialized alloys and stainless steel, offering a robust defense against harsh environmental elements, moisture, and chemical exposures.
Versatile Shielding Options: From open designs for oil baths to rubber-sealed variants that lock out microscopic debris, ensuring the internal rolling elements remain pristine under various hazards.
Our miniature bearing solutions are built upon a foundation of adaptable engineering, designed to align perfectly with your specific operational environments and volume procurement requirements.
Engineered for the most demanding spatial constraints, this series covers bore diameters from a mere 4mm up to 13mm. The internal geometry is optimized to handle rapid accelerations and sustained velocities up to 35,000 RPM. By balancing dynamic loads (up to 2.5 kN) and static loads (up to 1.2 kN), these components prevent premature wear in micro motors and precision instruments, ensuring your devices operate flawlessly under varying mechanical stresses.
Accommodates ultra-tight radial spaces for advanced miniaturization
Maintains structural stability and thermal balance at extreme rotational speeds
Optimized load distribution prevents localized raceway fatigue
The foundation of a long-lasting mechanical joint lies in its metallurgy. We offer these bearings in premium Chrome Steel (GCr15) for maximum hardness and fatigue resistance, alongside high-grade Stainless Steel and Specialty Alloys for harsh environments. This material diversity ensures that whether your equipment faces high-humidity environments or requires sterile, rust-free operation, the structural integrity of the bearing remains uncompromised, drastically reducing replacement cycles.
GCr15 Chrome Steel for superior load-bearing capacity and wear resistance
Stainless Steel options for excellent moisture and chemical defense
Specialty alloys available for extreme temperature fluctuations
Acoustic performance is a primary indicator of mechanical quality. Graded at ABEC-1, ABEC-3, and ABEC-5, these bearings feature meticulously honed raceways and perfectly spherical rolling elements. This micro-level precision eliminates the microscopic imperfections that cause grinding sounds and operational jitter. For manufacturers of medical devices and premium consumer electronics, this translates to a whisper-quiet, vibration-free user experience.
Strict ABEC grading ensures consistent batch-to-batch accuracy
Silences operational noise in acoustically sensitive environments
Reduces energy loss caused by unwanted vibrational friction
Contamination is the leading cause of premature bearing failure. To combat this, we provide highly adaptable shielding configurations. Choose the Open type for enclosed, clean-room environments; the ZZ Metal Shield for robust defense against larger particulates without adding friction; or the 2RS Rubber Seal for absolute protection against fine dust and moisture ingress. This flexibility allows you to tailor the defense mechanism exactly to your operational hazards.
Open configurations for maximum speed and external fluid lubrication
ZZ shields to deflect debris while maintaining high RPM capabilities
2RS seals to lock in grease and lock out microscopic contaminants
Thermal management and fluid rotation rely heavily on proper lubrication and internal clearance (C0, C2, C3). We pre-fill our bearings with application-specific lubricants—ranging from high-speed, low-viscosity oils to long-life and high-temperature greases. By perfectly matching the internal clearance to the thermal expansion rate of your application, we prevent bearing seizure and ensure smooth startup even in extreme conditions.
Custom internal clearances to accommodate thermal expansion
Pre-lubricated with premium greases to eliminate secondary processing
Significantly reduces maintenance overhead for the end-user
The true value of the MR series lies in its broad, yet highly precise, application spectrum. These components are the silent workhorses behind the fluid motion of robotic joint actuators, the precise paper feeds in office automation scanners, and the reliable spin of medical centrifuges. By standardizing your procurement around this versatile series, you can streamline your supply chain across multiple product lines.
Drives efficiency in micro motors, servo systems, and electric drives
Ensures repeatable accuracy in robotics and automated machinery
Meets the stringent hygiene and noise standards of medical equipment
We understand that off-the-shelf solutions do not always meet specialized engineering demands. Leveraging our direct manufacturing capabilities, we offer profound customization. From specialized laser marking for component traceability to bespoke packaging and rigorous sample verification, our engineering team collaborates directly with yours. This ensures the final product aligns flawlessly with your brand's quality standards and assembly line requirements.
Direct-from-factory customization of tolerances, seals, and materials
Private labeling and custom packaging to support your brand identity
Comprehensive sample testing and performance tuning prior to mass production
Securing a reliable supply of precision components is vital to maintaining your production schedules and protecting your market reputation. We operate not just as a vendor, but as an integrated extension of your manufacturing process. Our facility combines rigorous quality control protocols with scalable production capabilities, ensuring that whether you require a specialized prototype batch or a continuous high-volume supply, the quality remains impeccably consistent. We eliminate the friction of global procurement by offering transparent communication, rapid prototyping, and dedicated engineering support from the initial design phase through to final assembly.
Unwavering Quality Consistency: Advanced automated inspection systems guarantee that every single unit meets your exact specifications before it leaves our facility.
Scalable Production Readiness: Our agile manufacturing lines are optimized to handle fluctuating order volumes, ensuring you never face stockouts during peak production seasons.
Direct Engineering Support: Gain immediate access to our technical experts who assist in load calculations, material selection, and troubleshooting, accelerating your time-to-market.
Optimized Total Cost of Ownership: By minimizing defect rates and extending the operational life of the bearings, we significantly reduce your long-term warranty and replacement costs.
To assist your engineering and procurement teams in making informed decisions, we have compiled detailed answers to the most common technical inquiries regarding our miniature bearing solutions.
The choice between ZZ (metal shields) and 2RS (rubber seals) heavily impacts both speed and protection. ZZ shields provide a non-contact barrier against larger debris, allowing for maximum RPMs and minimal heat generation due to zero friction. In contrast, 2RS seals create a physical contact lip against the inner ring, offering superior protection against fine dust and moisture, but introducing slight friction that marginally reduces the maximum operational speed.
Internal clearance dictates the amount of space between the rolling elements and the raceways. For standard room-temperature operations, C0 is typically sufficient. If your micro motor generates significant heat or operates in a high-temperature environment, a C3 (larger) clearance is recommended to accommodate the thermal expansion of the steel, preventing bearing seizure. Conversely, C2 (tighter) is used when absolute precision and zero vibration are required, provided temperatures remain strictly controlled.
Yes, we offer specialized configurations for extreme thermal conditions. This involves a two-pronged approach: selecting specialty alloy materials that resist thermal degradation, and pre-filling the bearings with high-temperature synthetic greases that will not liquefy or burn off. Our engineering team will work with you to specify the exact material and lubricant combination based on your operational temperature range.
We adhere to strict quality assurance protocols to support your compliance requirements. For volume orders, we can provide comprehensive material certificates, dimensional inspection reports, and noise/vibration testing data. Additionally, we offer sample verification prior to full-scale production to ensure the components perform exactly as expected within your specific assembly.
Medical instruments, such as surgical drills or lab centrifuges, require absolute reliability and minimal acoustic output. Upgrading to an ABEC-5 precision grade means the bearing is manufactured with exceptionally tight tolerances and superior surface finishes. This drastically reduces internal friction and runout, resulting in a perfectly smooth rotation that eliminates distracting noise and prevents vibration from interfering with sensitive medical procedures.
