Hangzhou Huaxing Kechuang Holding Group Co., Ltd. is one of the leading manufacturers and suppliers of spindle bearings hcb71906c-2rsd-t-p4s-ul 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 Ceramic Bearings-HCB71906C-2RSD-T-P4S-UL
Exchange: HCB71906C-2RSD-P4S(FAG), H71906CTA-2RZ-HQ1-P4S, 71906CSN24TRV1VDTP4(NSK), S71906CDHC/P4A (SKF)
Technical Data
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Inside Ø (mm): |
30 |
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Outside Ø (mm): |
47 |
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Width (mm): |
9 |
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Contact Angle: |
15° |
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Rows Of Balls: |
Single Row |
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Seal: |
NBR |
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Ring Material: |
GCr15, 100Cr6, SUJ2 |
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Rolling Element Material: |
Ceramics |
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Cage Material: |
Phenolic Resin |
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Tolerance Class: |
P4S |
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Lubrication: |
Greased with L252 |
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Type of lubrication: |
Grease |
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Product weight: |
0,047 kg |
Brief Model Explanation
HCB: Hybrid Ceramic Bearing (GCr15 steel races + Si₃N₄ silicon nitride ceramic balls)
71906: Ultra-thin 19 series, bore 30mm, outer diameter 47mm, width 9mm, compact thin-wall structure
C: 15° contact angle, balancing high speed and radial rigidity
2RSD: Double-sided non-contact rubber seals, dust-proof and grease leakage prevention
T: Phenolic resin window-type cage
P4S: Super-precision P4 grade (higher precision than standard P4)
UL: Universal matching with light preload; single bearing can be freely combined in DB/DF/DT arrangements for installation
Features
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Thin-wall 719 series compact structure, fits miniature spindles with narrow and limited installation space
Hybrid structure: GCr15 steel races paired with lightweight silicon nitride ceramic balls
Limiting speed 30%–50% higher than all-steel bearings of the same size, centrifugal force greatly reduced at high RPM
Low friction and low heat generation, maintains stable precision during long-hour non-stop operation
Ultra-low thermal expansion coefficient keeps steady light preload without thermal deviation
Insulating ceramic balls eliminate stray shaft current corrosion for VFD inverter-driven spindles
Hard silicon nitride rolling elements offer excellent wear resistance, extending service life by 3–6 times
P4S super-precision grade + UL universal matching, ultra-low runout for micron-level machining
Double-sided 2RSD non-contact rubber seals block dust and avoid grease loss, lowering maintenance frequency
Phenolic resin window cage reduces ball collision vibration and noise for smooth silent high-speed rotation
Excellent resistance to humid environments and mild lubricant degradation
Applications
1. High-speed CNC Machine Tool Spindles
Ultra-precision small CNC milling & tapping spindles
High-speed engraving & miniature mold carving spindles
PCB high-speed routing & drilling spindles
Micro grinding spindles for tiny precision components
2. Dental & Medical Precision Grinding Equipment
Dental CAD/CAM milling spindles
Miniature precision grinding spindles for medical implant parts
3. Optical & Semiconductor Precision Processing Equipment
Optical lens polishing & cutting spindles
Rotary spindles for semiconductor wafer micro-processing
Precision rotary shafts of coordinate measuring machines & optical inspection instruments
4. Small Variable-Frequency High-Speed Servo & Electric Drive Equipment
High-speed built-in motorized electro-spindles
Miniature high-frequency servo motor shafts
Laboratory small high-speed centrifugal rotary equipment
5. High-End Automation & Lightweight Precision Equipment
High-speed rotary joints of miniature industrial robots
High-speed precision textile spindle shafts
Compact spindles for finishing micro aerospace components
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
Precision Spindle Bearings
Angular Contact Ball Bearings
Servo Motor Bearings
Vacuum Pump Bearings
Ball Screw Support Bearings
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
Features: High rigidity, low noise; suitable for grease lubrication or oil-mist lubrication.
6 Series X4YA-2RS (Double-lip seal) & APT Retainer Series
Features: High & low temperature resistance, superior sealing, high load capacity, long service life.
Application: New energy vehicle transmission systems.
Certificates
Exhibition
HXB INTRODUCTION
Established in 1995, as a leading ball bearing manufacturer in China, HXB offers more than 1,000 kinds of ball bearing to fulfill our customers' needs. With excellent production team and technical team, we can supply high quality products consistently.
After more than 20 years of development, HXB's main products involves deep groove ball bearings, angular contact ball bearings, hybrid ceramic bearings, etc. Our bearings are wildly used in electric motors, machinery tool spindle, CNC, NEVs and other fields.
Our production capacity:
Deep groove ball bearings: 34 production lines, 30,000,000pcs per year
Angular contact ball bearings: 14 production lines, 3,000,000pcs per year
Application fields: electric motors, pumps, textile machine, household appliance, machine tool spindle, CNC machine, healthcare industry, intelligence manufacturing etc.
Certificate: TS16949:2016, ISO9001:2015
FAQ
1. What is the difference between 719 thin-wall series and conventional 7000 series bearings?
The 719 series features thinner width and smaller outer diameter under the same bore size, with a more compact overall structure. It saves 20%–30% installation space compared with standard 7000 series bearings, making it exclusive for miniaturized, lightweight and high-precision spindle equipment. Though slim, it maintains excellent dynamic rigidity and high-speed stability, which cannot be replaced by ordinary standard bearings.
2. Why is hybrid ceramic structure better than full steel bearing for micro high-speed spindles?
Ordinary full steel bearings suffer from obvious centrifugal force, severe heat generation and easy thermal deformation at ultra-high speed, which causes precision attenuation and early failure. In contrast, silicon nitride ceramic balls are only 40% weight of steel balls, effectively reducing centrifugal load and friction heat. Meanwhile, ceramic material has low thermal expansion and insulation properties, solving the core pain points of full steel bearings such as high-speed thermal drift and VFD current corrosion, and greatly improving operational stability.
3. What is the advantage of 15° contact angle (C type) for micro spindles?
15° contact angle is the optimal universal angle for high-speed micro spindles. Compared with 25° contact angle bearings (focus on high rigidity), it has lower rolling friction and higher limiting speed; compared with smaller contact angle products, it provides better axial load capacity and running stability. It achieves a perfect balance of high speed, rigidity and precision, fully meeting the demands of micro milling, drilling and grinding processing.
4. Why choose 2RSD non-contact double seals for micro spindle bearings?
Different from contact seals with large friction resistance, 2RSD non-contact seals adopt gap sealing design, producing almost no friction heat at high speed and not affecting the ultimate speed of the spindle. It can effectively block fine dust and impurities in the air, prevent internal grease leakage and deterioration, maintain long-term clean lubrication inside the bearing, and extend maintenance cycle and service life.
5. What cage material is T type and what are its advantages?
T type represents phenolic resin window-type cage. This material has excellent high temperature resistance, low friction and vibration absorption performance. It can reduce collision and friction noise between ceramic balls and cage during high-speed operation, avoid cage deformation under long-term high temperature, and keep the bearing running smoothly and silently for a long time, which is very suitable for silent precision micro equipment.
Bearing Tolerance
Bore Diameter Tolerance Table (Deviation of d - Δdmp in μm)
| Bore Diameter d (mm) | P0 | P6 | P5 | P4 | P2 | |
|---|---|---|---|---|---|---|
| over | include | from / to | from / to | from / to | from / to | from / to |
| 0.6 | 2.5 | 0 / -8 | 0 / -7 | 0 / -5 | 0 / -4 | 0 / -2.5 |
| 2.5 | 10 | 0 / -8 | 0 / -7 | 0 / -5 | 0 / -4 | 0 / -2.5 |
| 10 | 18 | 0 / -8 | 0 / -7 | 0 / -5 | 0 / -4 | 0 / -2.5 |
| 18 | 30 | 0 / -10 | 0 / -8 | 0 / -8 | 0 / -5 | 0 / -2.5 |
| 30 | 50 | 0 / -12 | 0 / -10 | 0 / -9 | 0 / -6 | 0 / -4 |
| 50 | 80 | 0 / -15 | 0 / -12 | 0 / -9 | 0 / -6 | 0 / -4 |
| 80 | 120 | 0 / -20 | 0 / -15 | 0 / -10 | 0 / -8 | 0 / -5 |
| 120 | 180 | 0 / -25 | 0 / -18 | 0 / -13 | 0 / -10 | 0 / -7 |
| 180 | 250 | 0 / -30 | 0 / -22 | 0 / -15 | 0 / -12 | 0 / -8 |
Notes:
Tolerance values are given in micrometers (μm)
P0 = Normal precision grade; P2 = Highest precision grade
Tolerance decreases (tighter) as precision grade increases from P0 to P2
Applicable to radial bearings including deep groove ball bearings and angular contact ball bearings
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