Hangzhou Huaxing Kechuang Holding Group Co., Ltd. is one of the leading manufacturers and suppliers of precision bearings 71811actasup4 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.
Precision Bearings 71811ACTASUP4
Specifications
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Bearing No. |
71811ACTASUP4, 71811ACDP4 |
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Dimension |
55*72*9mm |
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Lubrication |
Oil or grease |
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Weight |
0.081kg |
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| Cr 9560N | Cor 10200N | |
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Rpm oil |
24000 |
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- Super-precision, high-capacity, single row angular contact ball bearing. |
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- It has also an axial load carrying capacity on both sides in the X- or O-arrangement in pair. |
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- Our precision bearings are a top-quality product that offers exceptional performance, reliability, and durability. With its advanced features and superior engineering, it is designed to meet the needs of even the most demanding industrial applications. Trust us to provide you with the best spindle bearing solution for your business needs. |
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| Bearing | d(mm) | D(mm) | B(mm) | r(mm) | r1(mm) | Cr(kN) | Cor(kN) | Grease (r/min) | Oil (r/min) | Light preload (N) | Medium preload (N) | Heavy preload (N) | weight (kg) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 71805AC | 25 | 37 | 7 | 0.3 | 0.1 | 4.2 | 2.8 | 36000 | 56000 | 22 | 44 | 88 | 0.018 |
| 71806AC | 30 | 42 | 7 | 0.3 | 0.1 | 4.7 | 3.2 | 32000 | 50000 | 26 | 52 | 104 | 0.022 |
| 71807AC | 35 | 47 | 7 | 0.3 | 0.1 | 5.2 | 3.6 | 28000 | 45000 | 30 | 60 | 120 | 0.026 |
| 71808AC | 40 | 52 | 7 | 0.3 | 0.1 | 5.7 | 4.0 | 24000 | 40000 | 35 | 70 | 140 | 0.030 |
| 71809AC | 45 | 58 | 7 | 0.3 | 0.1 | 6.3 | 4.5 | 22000 | 36000 | 40 | 80 | 160 | 0.034 |
| 71810AC | 50 | 65 | 7 | 0.3 | 0.1 | 6.9 | 5.0 | 20000 | 32000 | 45 | 90 | 180 | 0.038 |
| 71811AC | 55 | 72 | 9 | 0.3 | 0.1 | 8.5 | 6.2 | 18000 | 30000 | 50 | 100 | 200 | 0.055 |
Features
Precision Grade Standard
| Precision Class | Bore Tolerance(μm) | Outer Dia. Tolerance(μm) | Width Tolerance(μm) | Max Radial Runout(μm) | Max Axial Runout(μm) | Application Scenarios |
|---|---|---|---|---|---|---|
| P0 | 0 ~ -8 | 0 ~ -8 | 0 ~ -12 | 10 | 20 | General machinery, low-precision equipment |
| P6 | 0 ~ -5 | 0 ~ -5 | 0 ~ -8 | 6 | 12 | Ordinary motors, pumps, general reducers |
| P5 | 0 ~ -4 | 0 ~ -4 | 0 ~ -5 | 4 | 8 | Precision CNC machine tools, high-speed motors |
| P4 | 0 ~ -3 | 0 ~ -3 | 0 ~ -4 | 2.5 | 5 | High-speed spindles, machining centers, grinder spindles |
| P2 | 0 ~ -2.5 | 0 ~ -2.5 | 0 ~ -3 | 1.5 | 3 |
Bearing Matching Arrangement & Preload Specifications
| Matching Type | Code | Structure Diagram | Load Characteristics | Application Scenarios | Recommended Preload |
|---|---|---|---|---|---|
| Back-to-Back | DB | << >> | Bears bidirectional axial force, excellent overturning resistance | Machine tool spindles, heavy ball screw supports | Medium / Heavy Preload |
| Face-to-Face | DF | >> << | Bidirectional axial load capacity, good self-aligning performance | Long shaft supports, applications requiring high concentricity | Light / Medium Preload |
| Tandem | DT | << << | Withstands large unidirectional axial thrust | High-speed spindles under one-way thrust load | Medium Preload |
| 4-set Combined | QBC | << >> << >> | High rigidity, bidirectional load & anti-overturning capacity | Heavy-duty machine tools, PV cutting spindles | Heavy Preload |
| 5-set Combined | PBC | << >> << >> << >> | Ultra-high rigidity, abundant load margin | Ultra-heavy cutting, 24-hour continuous operation | Extra Heavy Preload |
Selection & Installation Guidelines
| Item | Requirements | English Version |
|---|---|---|
| Selection Principle | Choose Type C (15°) for high-speed working conditions; Choose Type AC (25°) for heavy loads; Custom high-speed cages for ultra-high speed use | Select 15°C type for high speed, 25°AC type for heavy load, custom high-speed cage for ultra-high speed scenarios |
| Fit Tolerance | Shaft & inner ring fit: k5/m5; Housing bore & outer ring fit: K5/H5 | Shaft & inner ring fit: k5/m5; Housing & outer ring fit: K5/H5 |
| Installation Method | Heat mount inner ring (80~100℃); Cold mount outer ring (-20~-30℃); Never strike bearings directly | Heat mount inner ring (80~100℃), cold mount outer ring (-20~-30℃), no direct impact |
| Lubrication Rules | High-speed operation: grease lubrication; Circulating oil lubrication for DN value＞1,000,000; Fill 1/3~1/2 of bearing cavity with grease | High speed: grease lubrication (circulating oil lubrication for DN>1 million), grease filling volume 1/3~1/2 of bearing cavity |
| Preload Control | Precision spindles must adopt matched preload. Preload level shall be selected based on rotating speed, load and temperature rise; Over-preload is forbidden | Preload must be applied for precision spindles, select preload level according to speed, load and temperature rise, avoid over-preload |
Applications
Precision bearings are used for high-speed CNC spindles, precision measuring instruments, aerospace accessory shafts, robot joints, hydraulic equipment, construction machinery reducers, fan shafts, textile machinery spindles.
Design and Development Capabilities
HXB has a set of more than 10 years of technical optimization precipitation, with the international advanced development concept of the development process, with the ability of design analysis, engineering production, test evaluation and technical management.
It has dozens of national patents. The technicians are proficient in using computer aided design software. PLM system is being progressively implemented.
Experimental Testing / Testing Ability
HXB has a comprehensive laboratory (including durability, physical and chemical, high and low temperature cycle, enamel-wire laboratory, performance, gear, magnetic observation room), with dozens of various equipment and instruments, with the ability to test and verify the performance of new products and components such as magneto, starter motor, generator electronic products. We will support you in selecting the best Precision bearings for your application.
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
Certificates
Exhibition
FAQ
Q1: What is the feature of 71800 series bearings compared to 71900 / 7200 series?
71800 belongs to ultra-thin wall lightweight series. It features the smallest outer diameter and width under the same inner diameter, saves maximum installation space inside spindles and equipment. Its rigidity is lower than 7200 series, so it is mainly applied to high-speed, light-load precision equipment requiring compact structure.
Q2: Which contact angle should I pick, C (15°) or AC (25°)?
Choose 15° C type prioritized for ultra-high rotating speed, low axial load scenarios to obtain lower temperature rise and smoother operation. Select 25° AC type if the spindle bears obvious axial force, it delivers larger axial load capacity and better running stability under alternating axial loads.
Q3: Can 71800 bearings be used in paired arrangement (DB/DF/DT)?
Yes. All 71800 precision bearings are universally ground on end faces at factory. They support DB, DF, DT multi-group matching and preset preload. Paired assembly greatly improves overall rigidity and anti-overturning performance for spindle application.
Q4: What precision grade is most commonly ordered for machine tool spindles?
P4 grade is the mainstream choice for standard high-speed CNC spindles. P2 ultra-precision grade is customized for ultra-precision grinding machines, measuring instruments and coordinate equipment. P5 is used for general low-speed precision machinery.
Q5: What lubrication mode is recommended for 71800 series high-speed operation?
For regular high speed below DN 1,000,000: high-speed grease lubrication is convenient for daily maintenance. When DN value exceeds 1,000,000, circulating oil lubrication is required to dissipate heat rapidly and restrain excessive temperature rise.
Q6: What typical equipment are 71800 series bearings widely applied to?
Main applications: small high-speed electric spindles, precision testing instruments, medical device rotary components, encoder shafts, miniature high-speed pumps, lightweight industrial robot joints and optical precision equipment.
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