Hangzhou Huaxing Kechuang Holding Group Co., Ltd. is one of the leading manufacturers and suppliers of hybrid bearing hcb7004-c-2rsd-t-p4s in China. As we have world-leading production equipment and strong manufacturing capabilities, we warmly welcome you to buy bulk high quality bearings at competitive price from our factory.
Hybrid Bearing With Ceramic Balls-HCB7004-C-2RSD-T-P4S
Exchange: HCB7004C-2RSD-P4S(F·A·G), H7004C-2RZ-HQ1-P4S, 7004CSN24TRV1VP4(NSK), S7004CDHC/P4A (SKF)
Technical Data
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Inside Diameter (mm): |
20 |
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Outside Diameter (mm): |
42 |
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Width (mm): |
12 |
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Contact Angle: |
15° |
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|
Cover: |
NBR |
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Roller Material: |
Ceramics |
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|
Retainer Material: |
Phenolic Resin |
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Lubrication type : |
Greased with L252 |
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Bearing Type |
Boundary Dimensions |
Abutment dimension |
Load rating |
RPM |
Weight |
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|
mm |
mm |
N |
1/min |
(kg) |
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|
d |
D |
B |
r (min) |
r1 (min) |
Da |
da |
ra (max) |
ra1 (max) |
Cr |
Cor |
Oil |
Grease |
||
|
H71904C-2RZ HQ1 |
20 |
37 |
9 |
0.3 |
0.3 |
33 |
24.5 |
0.15 |
0.15 |
3900 |
1340 |
75000 |
56000 |
0.036 |
|
H71904AC-2RZ HQ1 |
37 |
9 |
0.3 |
0.3 |
33 |
24.5 |
0.15 |
0.15 |
3700 |
1280 |
68000 |
51000 |
0.036 |
|
|
H7004C-2RZ HQ1 |
42 |
12 |
0.6 |
0.3 |
38 |
25.3 |
0.6 |
0.3 |
6500 |
2140 |
70000 |
52000 |
0.063 |
|
|
H7004AC-2RZ HQ1 |
42 |
12 |
0.6 |
0.3 |
38 |
25.3 |
0.6 |
0.3 |
6300 |
2060 |
63000 |
47000 |
0.063 |
|
Features
Ultra-Lightweight Construction: With a mass approximately 60% lower than traditional steel counterparts, ceramic rolling elements significantly mitigate centrifugal loads during high-RPM operation, enhancing dynamic stability.
Exceptional Durability: Surpassing conventional bearing steel in hardness, these components deliver outstanding resistance to surface wear and fatigue, resulting in a substantially extended operational lifespan.
Superior Thermal Stability: The minimal coefficient of thermal expansion ensures dimensional integrity under high-speed conditions, preventing thermal distortion and maintaining consistent preload for sustained precision.
Electrical Isolation: As a natural insulator, ceramic effectively blocks stray currents, eliminating the risk of electrical erosion and raceway pitting in electrically sensitive environments.
Extreme Speed Capability: Capable of achieving DN values far beyond the limits of all-steel spindle bearings, this design is perfectly suited for ultra-high-speed rotational applications.
Minimal Friction & Heat: The polished ceramic surface drastically reduces rolling resistance, curbing heat accumulation and preserving spindle accuracy over extended periods.
Enhanced Chemical Resilience: Offering greater protection against moisture, mild acids, and lubricant degradation compared to standard steel bearings, ensuring reliable performance in challenging environments.
Applications
High-Speed Electric & Machine Tool Spindles
This represents the primary use case for the bearing. The 15° contact angle works in tandem with the reduced centrifugal load of ceramic rolling elements to deliver exceptional accuracy and minimal thermal output at extreme rotational velocities. The P4S universal pairing configuration allows for adaptable mounting arrangements-such as back-to-back, face-to-face, or tandem setups-tailored to specific stiffness needs, making it a staple in high-speed milling centers, grinding units, and engraving spindles.
️ High-Speed PCB Drilling & Routing Equipment
PCB drilling spindles demand ultra-high RPMs (frequently reaching tens of thousands) alongside rapid acceleration and deceleration cycles. The reduced mass of ceramic balls substantially lowers rotational inertia, while the 2RSD non-contact seals offer essential particulate protection without the frictional heat generated by contact-type seals, thereby satisfying the stringent thermal stability requirements of high-speed operations.
Precision Instruments & Testing Equipment
For applications where vibration and temperature fluctuations are critical concerns-such as high-speed rotary test benches and precision optical inspection systems-the bearing's low friction characteristics and thermal consistency safeguard the integrity and accuracy of measurement data.
️ High-Speed Motors & Turbo Machinery
Ideal for high-speed motor spindles that require elevated RPMs, quiet operation, and extended service life, as well as select precision rotating components within aerospace systems.
Advantages
HXB was founded in 1995, with nearly 30 years of dedicated development, HXB now operates6 subsidiaries.
∗ 2 high-tech R&D centers
∗ 2 modern manufacturing factories - Hangzhou Yijia Precision Bearing Co., Ltd. and Zhejiang Ruiyang Bearing Technology Co., Ltd.
∗ Supported by advanced digital MES and SPC management systems
∗ IATF16949:2016, ISO9001:2015 and ISO14001 certifications
∗ High-end equipment and high-quality material
About HXB
1. Hangzhou Factory - YJB
Founded in June 2007, YJB is located in Hangzhou. As a subsidiary of HXB Group, we are a national high-tech enterprise and provincial science & technology enterprise specializing in R&D and manufacturing of high-precision, high-speed, advanced, special and professional bearings.
Core Capabilities & Intelligent Manufacturing
- Product Size: Inner diameter Φ3–Φ300mm
- Precision Classes: P2, P4 (ultra-precision grades)
- Annual Capacity: 3 million sets of precision bearings in a lean & intelligent factory
- Equipment Investment: Over RMB 3 million in world-leading precision testing instruments
- Digital Transformation: with full deployment of MESYS bearing design platform, ERP, MES, WMS, SPC real-time quality monitoring and OA systems, building a benchmark smart manufacturing plant.
Main Products
High-Precision Spindle Bearings 7000 series,7200 series,7300 series, 71900 series,71800 series
Angular Contact Ball Bearings
Servo Motor Bearings P4
Vacuum Pump Bearings P4
Ball Screw Support Bearings P4,P5
2. Huzhou Factory
In 2021, the deep groove ball bearing factory relocated from Hangzhou to Huzhou. It operate in a 10,000㎡ production facility with a team of 75 employees, focused on the R&D, and manufacturing of high-performance deep groove ball bearings.
We maintain a professional engineering and quality system to ensure stable precision and reliability.
Engineering Team: 4 bearing design & process engineers, accounting for 5% of staff.
Quality Team: 15 quality personnel, including 2 quality engineers, 20% of staff, covering incoming inspection, in-process control and final testing.
Product Range
Series: 6000–6024, 6200–6214, 6300–6314, 6800–6824, 6900–6924 with 2RS or 2Z
6 Series X4YA-2RS (Double-lip seal) & APT Retainer Series
Certificates
Exhibition
FAQ
Are hybrid ceramic bearings suitable for all high-speed applications?
No. While they excel in high-speed, high-precision, electrically demanding, or corrosive environments, they are not universally optimal. In standard-speed applications where fatigue spalling is the primary failure mode, high-quality all-steel bearings may offer longer, more cost-effective service life. The higher initial cost of ceramic bearings must be justified by specific performance requirements, and successful implementation requires strategic assessment to ensure measurable returns in reliability and total cost of ownership.
How does lubrication differ for hybrid ceramic bearings compared to all-steel bearings?
Hybrid ceramic bearings require specialized lubrication strategies due to the distinct surface properties of silicon nitride. While they can operate with less lubricant than steel bearings, they still require regular maintenance with silicon-based or fluorine-based greases to prevent dry running and wear. Mixing different grease types must be avoided, and fill volume should be maintained at 1/3 to 1/2 of the bearing cavity. The smooth ceramic surface reduces friction, but improper lubrication can still lead to premature failure, especially under high-load or high-temperature conditions.
What technical parameters must be provided for accurate bearing selection?
To ensure optimal selection or custom design, provide the equipment model, maximum spindle speed, radial and axial load requirements, and installation space dimensions. Additionally, specify the operating temperature range, preferred lubrication method, and expected service life. These parameters enable the technical team to verify selection criteria and recommend the ideal bearing configuration, including internal clearance, preload force, and cage material, tailored to your specific application demands.
What are the typical lead times for hybrid ceramic spindle bearings?
Standard hybrid ceramic spindle bearings generally have a delivery window of 20 to 30 days for bulk orders. Non-standard customization or specialized material requirements may extend lead times to 40 to 60 days. Manufacturers with substantial production capacity can often prioritize urgent orders, but specific delivery schedules should always be confirmed through direct communication to account for current production loads and material availability.
Do your products come with a warranty?
A: Most items carry a 12-month manufacturer's warranty against factory defects. Warranty does not cover man-made damage.
Hybrid Ceramic Bearings: Open vs. Sealed Selection Logic
The choice between open and sealed bearings hinges on balancing "speed/temperature rise" against "protection/maintenance."
| Feature | Open Bearings | Sealed Bearings |
|---|---|---|
| Core Advantage | Highest limiting speed, minimal friction heat, allows on-site lubrication and cleaning | Strong protection, maintenance-free, prevents grease leakage and contaminant ingress |
| Core Disadvantage | No protection, prone to contamination; requires regular lubrication maintenance | Seals add friction, limiting maximum speed; often non-relubricatable (depending on design) |
| Ideal Conditions | Clean environments, ultra-high speed, oil mist/air-oil lubrication, frequent maintenance | Dusty/humid environments, medium-high speed, maintenance-free requirements, grease lubrication |
When to Choose Open Bearings:
Pursuing Limiting Speed: When operating speeds approach or exceed the limits of sealed bearings, open designs are essential to eliminate seal friction.
Requiring External Lubrication: Open structures are mandatory when using air-oil lubrication, oil mist, or jet lubrication systems.
Clean & Maintainable Environments: In cleanrooms or labs with scheduled maintenance plans, open bearings deliver optimal performance.
When to Choose Sealed Bearings:
Harsh Environments: Seals are necessary to protect bearing life when dust, moisture, or cutting fluids are present.
Maintenance-Free Design: For hard-to-reach equipment or applications requiring long-term maintenance-free operation (e.g., certain motors, appliances), pre-greased sealed bearings are the standard.
Medium-High Speed Applications: When speeds are within the sealed bearing's limits and protection takes priority over maximum speed, sealed bearings offer better overall reliability.
Why Does the European Market Prefer Oil-Lubricated Open Bearings?
The European preference for oil-lubricated open bearings is not due to a single factor, but rather a combination of stringent industrial standards, environmental regulations, and advanced manufacturing philosophies:
Pursuit of Ultimate Performance & Precision: Europe is a global hub for high-end machine tools and precision manufacturing. Oil lubrication (especially air-oil lubrication) provides a more stable oil film, lower friction, and more precise temperature control compared to grease. The open structure is a prerequisite for this lubrication method, satisfying the苛刻 requirements of P2/P4 ultra-precision spindles for thermal stability and accuracy.
Driven by Environmental & Sustainability Regulations: The EU has strict regulations on industrial emissions and waste (e.g., ISO 14001). Oil lubrication systems are typically closed-loop, allowing lubricants to be recycled and reused, significantly reducing waste grease generation and disposal costs. In contrast, replacing grease-lubricated sealed bearings generates more solid waste, and over-greasing can cause contamination.
Focus on Long Service Life & Total Cost of Ownership (TCO): European industry prioritizes long-term reliability and TCO. Although oil-lubricated open bearings have higher initial system costs, they offer longer service lives and more controllable maintenance cycles, avoiding bearing scrapping due to seal failure. This "preventive maintenance" philosophy aligns perfectly with European lean manufacturing models.
Standardization & Certification Systems: Regulations like the European Machinery Directive (2006/42/EC) set clear requirements for equipment safety, noise, and emissions. Oil-lubricated open bearing systems are easier to integrate with sensors and monitoring devices, enabling condition monitoring and predictive maintenance to meet compliance requirements and enhance equipment safety.
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