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The 634 Deep Groove Ball Bearing is a compact, high-precision component engineered for low-noise, high-speed applications in electronics, micro motors, and medical devices. Available in open, shielded (ZZ), and sealed (2RS) variants, it delivers reliable performance with minimal friction and extended service life.
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The 634 Deep Groove Ball Bearing is meticulously engineered to transform the performance and longevity of your precision equipment. When integrated into your assemblies, the first thing you will notice is the absolute absence of vibration. The moment you rotate the inner ring, the tactile feedback is flawlessly smooth, devoid of any granular resistance or micro-stutters. Crafted with a mirror-like finish on the raceways, these bearings facilitate a whisper-quiet rotation that drastically reduces mechanical wear and energy consumption. By minimizing internal friction, they actively prevent heat buildup even during continuous, high-speed operations, thereby extending the operational lifespan of your end products. The polished, flawless exterior reflects the rigorous grinding and super-finishing processes applied during our manufacturing cycle. Designed to handle both radial and axial loads in extremely confined spaces, this component solves the critical challenge of maintaining structural integrity without adding unnecessary bulk. For procurement teams looking to elevate product reliability while strictly managing production costs, this bearing offers a seamless blend of metallurgical excellence and dimensional stability, ensuring your machinery operates at peak efficiency day in and day out.
Parameter | Value | Description |
Bearing Model | 634 | Deep Groove Ball Bearing |
Inner Diameter (d) | 4 mm | Shaft diameter |
Outer Diameter (D) | 16 mm | Housing bore diameter |
Width (B) | 5 mm | Bearing width |
Chamfer (r min) | 0.3 mm | Minimum chamfer size |
Item | Specification |
Bearing Type | Deep Groove Ball Bearing |
Precision Grade | ABEC-3 / ABEC-5 |
Noise Level | Z1 / Z2 (low noise) |
Sealing Type | Open / ZZ / 2RS |
Material | Chrome Steel (GCr15) / Stainless Steel |
Cage Material | Steel / Nylon |
Lubrication | Grease or Oil |
Operating Temperature | -20°C to +120°C |
Load Type | Value |
Dynamic Load Rating (Cr) | Approx. 1.35 kN |
Static Load Rating (Cor) | Approx. 0.60 kN |
Note:Load ratings may vary slightly depending on bearing clearance, material selection, and lubrication conditions.
Bearing Version | Max Speed |
Open Type | ~40,000 RPM |
Metal Shield (ZZ) | ~32,000 RPM |
634 – Open type
634ZZ – Double metal shields
Our 634 Deep Groove Ball Bearing is designed to push the boundaries of miniature rotational technology. By focusing on microscopic tolerances and advanced metallurgy, we have created a component that actively enhances the operational flow of your machinery, reducing downtime and maintenance requirements.
Acoustic Excellence: Engineered to meet strict Z1 and Z2 noise levels, ensuring your final product operates with a quiet, unobtrusive hum rather than a disruptive mechanical grind.
Thermal Management: The optimized internal geometry allows for superior heat dissipation, preventing lubricant degradation during prolonged use.
Effortless Integration: The precise 0.3 mm minimum chamfer allows for smooth, snag-free insertion during automated robotic assembly processes.
Load Distribution: Despite its miniature size, the internal raceway curvature is perfectly calibrated to distribute the 1.35 kN dynamic load evenly across the ball bearings.
Achieving flawless integration into your micro-assemblies starts with uncompromising dimensional accuracy. The standard 4x16x5mm profile of the 634 Deep Groove Ball Bearing is machined under strict environmental controls to prevent thermal expansion during production, guaranteeing a perfect fit every time.
Microscopic Tolerances: Available in both ABEC-3 and ABEC-5 precision grades, these bearings drastically reduce radial runout, ensuring the central shaft spins with absolute true concentricity.
Automated Assembly Ready: The exact 4mm inner bore and 16mm outer diameter are ground to exact specifications, eliminating the risk of press-fit damage during your manufacturing process.
Vibration Eradication: By maintaining strict control over the dimensional variance, these bearings prevent the micro-vibrations that typically lead to early fatigue in sensitive electronic components.
The foundation of any high-performing rotational component lies in its metallurgical integrity. We utilize premium-grade materials combined with advanced thermal treatments to deliver exceptional durability and resistance to structural deformation under stress.
Premium Chrome Steel (GCr15): The core material offers an incredibly dense grain structure, providing superior hardness and resistance to contact fatigue, resulting in a solid, unyielding feel.
Corrosion-Resistant Stainless Steel Option: For environments exposed to moisture or harsh chemicals, our stainless steel variants maintain their pristine, rust-free appearance and functionality.
Rigorous Super-Finishing: The raceways undergo a specialized honing process that removes microscopic peaks, creating a glass-like surface that minimizes rolling resistance.
Cage Durability: Choose between robust steel cages for high-temperature resilience or lightweight nylon cages for reduced inertia and quieter operation.
When your applications demand rapid rotation, stability is non-negotiable. This bearing is specifically calibrated to handle extreme RPMs without compromising structural integrity or generating excessive acoustic output, keeping your machinery running smoothly.
Extreme Velocity Thresholds: The open variant effortlessly reaches speeds up to 40,000 RPM, making it the ideal choice for high-speed micro-turbines and dental drills.
Shielded Speed Capacity: Even with the protective ZZ metal shields installed, the bearing maintains a highly efficient rotational capacity of up to 32,000 RPM.
Z1/Z2 Acoustic Signature: The internal components are matched with such precision that the bearing easily achieves Z1 and Z2 low-noise ratings, crucial for consumer-facing electronics.
Frictionless Momentum: The low-torque design ensures that minimal electrical energy is wasted overcoming mechanical drag, improving the battery life of portable devices.
Environmental contaminants are the leading cause of premature component failure. To combat this, we offer highly adaptable sealing and lubrication configurations tailored to protect the internal rolling elements regardless of your specific operating environment.
Versatile Sealing Options: Select the Open type for clean environments, the ZZ dual metal shields for protection against larger particulates, or the 2RS dual rubber seals for ultimate defense against dust and moisture.
Custom Lubrication Profiles: We support custom fill rates using either high-speed oils for low-friction applications or specialized low-noise greases for lifetime lubrication.
Broad Temperature Resilience: The standard lubricants and materials are engineered to perform flawlessly across a wide thermal spectrum, from freezing -20°C conditions up to a blistering +120°C.
Maintenance-Free Operation: The ZZ and 2RS variants are sealed for life, locking the pristine lubricant inside and eliminating the need for costly manual re-lubrication.
Space-constrained applications no longer need to sacrifice power or precision. The 634 Deep Groove Ball Bearing serves as the critical connective tissue in a wide array of advanced technological sectors, providing a high-performance solution where larger bearings simply cannot fit.
Micro-Motor Systems: Delivers the low starting torque and high-speed stability required for precision servo motors and stepper motors.
Medical Instrumentation: The smooth, silent operation is perfect for diagnostic equipment and surgical tools where reliability and low noise are paramount.
Office Automation: Ensures the crisp, jam-free operation of printers, copiers, and scanners by providing stable rotational support for paper feed rollers.
Precision Measurement Devices: The ABEC-5 precision option guarantees the exact positioning required for sensitive optical and measuring equipment.
We understand that off-the-shelf solutions do not always meet the rigorous demands of specialized engineering projects. Our facility is fully equipped to modify every aspect of this bearing to align perfectly with your proprietary designs and operational requirements.
Tailored Radial Clearance: Choose between C0 clearance for standard applications or C2 tighter clearance for applications requiring absolute minimal shaft play.
Private Labeling: We offer custom laser engraving on the bearing shields or outer rings, ensuring your brand identity is maintained down to the component level.
Application-Specific Optimization: Our engineering team collaborates directly with your designers to adjust grease fill volumes, cage types, and seal materials prior to mass production.
Export-Ready Packaging: We provide customized, industrial-grade packaging solutions designed to protect the bearings from moisture and impact during global transit.
In today's fast-paced manufacturing landscape, a dependable component pipeline is just as important as the component itself. We bridge the gap between premium metallurgical quality and economic viability, ensuring your production lines never experience downtime.
Direct Source Pricing: By eliminating third-party distributors, we provide a highly competitive cost structure that significantly improves your overall profit margins.
Scalable Production: Whether you require a small batch for prototype testing or millions of units for global product launches, our factory can scale instantly to meet your volume demands.
Consistent Lead Times: Optimized manufacturing workflows and extensive raw material reserves allow us to guarantee delivery schedules, keeping your assembly lines moving.
Dedicated Technical Support: Every volume order is backed by a responsive commercial and engineering team ready to assist with integration troubleshooting and performance validation.
Partnering with the right manufacturer transforms your procurement process from a logistical challenge into a strategic advantage. We pride ourselves on being more than just a vendor; we act as an extension of your own engineering and quality control departments.
Uncompromising Quality Control: Every batch undergoes rigorous acoustic, dimensional, and visual inspections before leaving our facility, ensuring a zero-defect integration for your products.
Deep Industry Expertise: Decades of experience in precision bearing manufacturing allow us to anticipate your technical challenges and offer proactive, proven solutions.
Global Standards Compliance: All manufacturing processes strictly adhere to ISO and international bearing standards, guaranteeing global compatibility and safety.
Long-Term Value Creation: We focus on reducing your total cost of ownership by providing bearings that last longer, perform better, and require fewer replacements over time.
Review our most commonly asked technical and procurement questions below to understand how the 634 Deep Groove Ball Bearing can seamlessly integrate into your advanced production lines and resolve your engineering challenges.
Q1: What dictates the choice between Open, ZZ, and 2RS sealing for the 634 bearing?
A1: The choice depends entirely on your operating environment. Open bearings are ideal for sealed, clean environments like gearboxes where oil lubrication is present and maximum speed is required. ZZ (metal shields) offer excellent protection against larger particles while maintaining high speeds up to 32,000 RPM. 2RS (rubber seals) provide the ultimate defense against fine dust and moisture, though the slight seal friction marginally reduces the maximum speed limit.
Q2: How does specifying an ABEC-5 grade over ABEC-3 impact the performance of my equipment?
A2: ABEC-5 bearings are manufactured to significantly tighter dimensional tolerances than ABEC-3. This results in lower radial runout, meaning the shaft will spin much truer. For applications like optical sensors or precision medical devices, this reduction in micro-wobble is critical for accurate data collection and smooth operation.
Q3: Can the 634 bearing operate effectively beyond the standard +120°C temperature limit?
A3: The standard GCr15 chrome steel and standard grease are rated up to +120°C. If your application exceeds this, we can customize the bearing with specialized high-temperature synthetic greases and heat-stabilized steel treatments, allowing safe operation at elevated temperatures without risking metallurgical degradation.
Q4: What is the practical difference between C0 and C2 radial clearance in micro-motor applications?
A4: C0 is the standard clearance suitable for most general applications, allowing for normal thermal expansion. C2 provides a tighter internal clearance. In micro-motors where reversing directions frequently occurs, C2 clearance minimizes the internal "slop" or play, resulting in more precise control and reduced vibration during rapid directional changes.
Q5: How do you ensure the consistency of the 1.35 kN dynamic load rating across large production volumes?
A5: We maintain load rating consistency through strict metallurgical sourcing and automated heat treatment processes. By ensuring the steel's hardness remains uniform across every batch, and by utilizing laser-guided grinding to perfect the raceway curvature, we guarantee that every single bearing can handle the specified 1.35 kN dynamic load without premature fatigue
