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The MR913 Miniature Radial Ball Bearing is a precision-engineered single-row ball bearing designed for compact, high-speed applications requiring low noise and smooth rotation. It offers reliable performance in micro-motors, robotics, and precision instruments, with customizable seal and material options to meet diverse operational demands.
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The MR913 Miniature Radial Ball Bearing represents the pinnacle of micro-engineering, meticulously crafted to deliver uncompromising rotational smoothness in the most space-constrained environments. When you hold this bearing, the superior craftsmanship is immediately apparent in its flawless, polished metallic finish and the seamless, frictionless glide of its inner ring. Manufactured from premium-grade GCr15 bearing steel or corrosion-resistant stainless steel, it is subjected to advanced heat treatment processes that harden the raceways, ensuring exceptional fatigue resistance even under continuous, high-speed stress. In operation, the bearing produces a barely perceptible, low-decibel hum, a testament to its superior Z1 and Z2 noise level ratings. This acoustic refinement is critical for sensitive applications like medical devices and precision robotics, where auditory interference is strictly unacceptable. By integrating this component into your mechanical assemblies, you are not merely purchasing a structural part; you are securing a foundation of reliability that dramatically reduces maintenance downtime, enhances the lifecycle of your end products, and elevates the overall operational efficiency of your entire production output.
Parameter | Value | Description |
Bearing Model | MR913 | Miniature Radial Ball Bearing |
Inner Diameter (d) | 13 mm | Shaft diameter |
Outer Diameter (D) | 30 mm | Housing bore diameter |
Width (B) | 9 mm | Bearing width |
Chamfer (r min) | 0.3 mm | Minimum chamfer size |
Item | Specification |
Bearing Structure | Single-row miniature ball bearing |
Precision Grades | ABEC-1 / ABEC-3 / ABEC-5 |
Noise Level | Z1 / Z2 |
Seal / Shield Options | Open / ZZ / 2RS |
Material | GCr15 bearing steel / Stainless steel |
Cage Material | Steel cage / Polyamide cage |
Lubrication | Pre-greased or oil |
Operating Temperature | -20°C to +120°C |
Load Type | Value |
Dynamic Load Rating (Cr) | Approx. 2.50 kN |
Static Load Rating (Cor) | Approx. 1.20 kN |
Reference values; actual performance depends on bearing clearance, lubrication, and operating conditions.
Bearing Version | Limiting Speed |
Open Type | ~28,000 RPM |
Metal Shield (ZZ) | ~22,000 RPM |
| Rubber Seal (2RS) | ~15,000 RPM |
Engineered to resolve the most demanding mechanical challenges, the MR913 miniature bearing transforms how compact machinery operates, delivering tangible improvements to your assembly line and end-user satisfaction.
Vibration and friction are the primary enemies of micro-machinery. This bearing is precisely calibrated to maintain perfect concentricity, drastically reducing wear and tear on adjacent components and extending the lifecycle of your entire assembly.
Eliminates micro-vibrations that can compromise sensitive electronic and optical equipment.
Ensures a fluid, frictionless glide that significantly reduces energy consumption in battery-operated devices.
Maintains absolute structural integrity even under sudden, unpredictable load shifts.
For applications where silence is a premium feature, the internal geometry of this bearing has been refined to suppress operational noise at its source.
Achieves strict Z1 and Z2 noise level standards, perfect for consumer electronics and quiet laboratory environments.
Polished raceways and precisely matched balls prevent the harsh grinding sounds typical of inferior alternatives.
Enhances the premium, high-quality feel of your final product through whisper-quiet operation.
Whether operating in freezing conditions or high-heat industrial environments, this component maintains its dimensional stability without seizing or degrading.
Guarantees flawless operation within a broad temperature spectrum of -20°C to +120°C.
Superior heat dissipation properties prevent thermal expansion during prolonged high-speed rotations.
Customizable lubrication options ensure the bearing never runs dry, regardless of the operating climate.
Our engineering approach ensures that every MR913 bearing integrates flawlessly into your specific industrial requirements, providing a seamless bridge between raw specifications and real-world performance.
The standardized 13mm x 30mm x 9mm profile provides engineers with a highly predictable, compact footprint. This exact sizing allows for effortless integration into tight housing spaces, streamlining the design phase for compact equipment and reducing time-to-market.
By offering both GCr15 bearing steel and stainless steel, we empower you to choose the exact metallurgical properties your application demands. The advanced heat-treatment process hardens the steel to resist micro-fractures, ensuring long-term durability and dimensional consistency across massive production runs.
With precision grades scaling from ABEC-1 to ABEC-5, and a staggering limiting speed of up to 28,000 RPM, this bearing is the ultimate solution for micro-motors. It guarantees that high-speed rotations remain perfectly stable, safeguarding your expensive equipment against catastrophic high-speed failures.
Environmental contamination can destroy internal mechanics. We provide versatile protection protocols to shield the internal rolling elements from dust, moisture, and debris.
Open Type: Maximizes speed capabilities and heat dissipation for clean-room environments.
ZZ Shield (Double Metal): Defends against particulate matter while allowing high-speed functionality up to 22,000 RPM.
2RS Seal (Double Rubber): Creates an impenetrable barrier against liquids and fine dust, ideal for harsh environments.
This component is the silent powerhouse behind numerous modern innovations. It serves as the critical joint in robotic arms, the smooth drive mechanism in laboratory centrifuges, and the reliable core in compact power tools and servo drives.
We understand that standard off-the-shelf solutions do not always suffice. Our production lines are equipped to adapt to your exact engineering blueprints.
Custom internal clearances (C0, C2, C3) to expertly manage thermal expansion in heat-intensive applications.
Laser-etched branding and part numbers for seamless inventory management and brand reinforcement.
Pre-production sample validation to guarantee perfect alignment with your stringent quality standards.
Sourcing directly from the manufacturing floor eliminates intermediary markups. We guarantee stable lead times for continuous projects and offer highly competitive pricing structures that protect your profit margins on both medium and large-scale orders.
Selecting the right manufacturing partner is just as critical as selecting the right component. We provide a robust infrastructure designed to support your operational scale and elevate your product quality.
Every bearing that leaves our facility has survived a gauntlet of automated and manual inspections. We measure tolerances down to the micron, ensuring that the first bearing you receive performs exactly like the millionth.
Multi-stage acoustic and vibration testing to guarantee strict Z1/Z2 compliance.
Rigorous metallurgical analysis to verify steel purity, hardness, and corrosion resistance.
Automated dimensional sorting to eliminate any deviation from the standard parameters.
You are never left to guess which specification suits your needs. Our team of mechanical engineers acts as a direct extension of your own research and development department.
Expert consultation on lubrication and clearance selection based on your specific operating environment.
Rapid prototyping and sample delivery to keep your product development cycles on schedule.
Post-integration troubleshooting to ensure maximum mechanical efficiency and longevity.
We have optimized our packaging and shipping protocols to ensure your components arrive in pristine condition, ready for immediate assembly line deployment.
Industrial-grade, anti-corrosive packaging protects against transit damage and oxidation.
Flexible production scheduling to accommodate your just-in-time manufacturing requirements.
Transparent, proactive communication regarding lead times and production milestones.
To assist your engineering and procurement teams, we have compiled detailed answers to the most critical technical inquiries regarding the MR913 series.
The ZZ variant utilizes double metal shields, which provide excellent protection against larger particulates while maintaining a very low friction coefficient, allowing for high speeds up to 22,000 RPM. The 2RS variant features double rubber seals that make physical contact with the inner ring. This creates a superior barrier against moisture and fine dust, though the slight increase in friction limits the maximum speed to approximately 15,000 RPM.
Yes, we highly recommend customizing the internal clearance for environments prone to thermal expansion. While C0 is the standard clearance for normal operations, we can manufacture the MR913 with a C3 clearance. The C3 specification provides additional microscopic space between the balls and raceways, preventing the bearing from seizing when the metal expands under high heat.
GCr15 bearing steel is the industry standard for high load capacity and exceptional fatigue life under normal environmental conditions. However, if your application exposes the bearing to corrosive elements, moisture, or requires frequent washdowns (such as in medical or laboratory machinery), stainless steel is the superior choice. It sacrifices a marginal amount of load capacity in exchange for unparalleled rust and corrosion resistance.
We offer specialized low-noise greases that are formulated with ultra-fine thickeners and premium base oils. These bespoke greases dampen the acoustic resonance of the rolling elements, ensuring the bearing operates smoothly within the strict Z1 or Z2 noise thresholds. We can pre-fill the bearings with the exact volume of grease required for your specific operational speed to prevent overheating.
Absolutely. We provide comprehensive branding services, which include precision laser marking on the metal shields (ZZ) or the outer ring. You can request custom logos, specific part numbers, or batch codes. This service greatly enhances your brand visibility and simplifies component traceability within your own assembly and supply chain processes.
