Hangzhou Huaxing Kechuang Holding Group Co., Ltd. is one of the leading manufacturers and suppliers of angualr contact ball bearings 7008cehc/gap4a 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.
Angular Contact Ball Bearings-7008CEHC/GAP4A, 7008CDHC/GAP4A
Technical Data
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Inside Ø (mm): |
40 |
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Outside Ø (mm): |
68 |
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Width (mm): |
15 |
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Tolerance for inside-Ø (mm): |
0/-0,006 |
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Tolerance for outside-Ø (mm): |
0/-0,007 |
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Tolerance for width (mm): |
0/-0,12 |
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Tolerance for shaft da (mm): |
0,25/-0,25 |
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Contact Angle: |
15° |
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Rows Of Balls: |
Single Row |
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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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Type of lubrication: |
Oil |
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Product weight: |
0,1680 kg |
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Set |
DB, DT, QBC |
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Exchange |
H7008CHQ1SUP4, HCB7008C-T-P4S-UL, 7008CSN24TRP4 |
Features
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The 7008CEHC/GAP4A and 7008CDHC/GAP4A are high-precision open-type hybrid ceramic angular contact ball bearings engineered for premium ultra-high-speed spindle systems. Adopting a steel-ring + Si₃N₄ silicon nitride ceramic ball hybrid structure, standard open design without seals, and top-tier P4S super precision grade, these two models support universal matching configuration, delivering outstanding speed stability, thermal resistance and consistent precision for high-end precision machining equipment.
1. Open-Type Structural Design for Extreme High-Speed Performance
Featuring a pure open structure with no sealing shields, the bearings eliminate friction resistance and heat accumulation caused by contact seals. This fully releases the ultimate speed potential of the bearing, enabling excellent heat dissipation and smooth rolling motion. The open structure is perfectly compatible with professional oil-air lubrication and circulating oil lubrication systems, ensuring continuous temperature control and zero precision attenuation during long-duration ultra-high-speed operation.
2. Premium Hybrid Ceramic Rolling System
Equipped with high-purity Si₃N₄ ceramic balls and high-rigidity premium steel raceways, the hybrid structure integrates dual core advantages. The lightweight ceramic rolling elements effectively reduce centrifugal force and rotational inertia at high RPM, lowering operating temperature and vibration. Meanwhile, the non-conductive ceramic material provides complete electrical insulation, thoroughly preventing shaft current and stray current corrosion, electric pitting and raceway damage common in all-steel bearings.
3. P4S Ultra-High Precision Tolerance Grade
Manufactured under strict P4S super-precision manufacturing standards, the bearings achieve ultra-low runout tolerance, ultra-smooth raceway surface finish and consistent ball roundness. Compared with conventional P4-grade bearings, P4S upgraded precision delivers higher rotational accuracy, better dimensional stability and tighter tolerance consistency, meeting the ultra-precision positioning requirements of high-end finishing spindles.
4. Universal Match Pairing Capability (GA Standard)
Marked with GA universal pairing code, both 7008CEHC and 7008CDHC series support arbitrary universal pairing, including back-to-back, face-to-face and tandem combinations. The unified preload deviation standard enables free assembly of multiple bearings without strict single-model pairing restrictions. It greatly simplifies spindle assembly procedures, improves installation flexibility, and ensures consistent preload balance and synchronous operation accuracy after pairing.
5. Differentiated Contact Angle Configuration
The two models adopt optimized independent contact angle designs to cover diverse working conditions: 7008CEHC features a low-resistance contact angle focused on extreme high-speed and low-heat performance; 7008CDHC adopts a balanced angle design that balances high-speed capability and comprehensive radial & axial rigidity. Users can select models according to actual speed and load demands, realizing targeted performance matching.
Applications
With open-type high-speed structure, P4S ultra-precision and universal pairing advantages, these two hybrid ceramic bearings are exclusively applied to high-end ultra-high-speed and ultra-precision industrial equipment that requires professional lubrication and strict precision retention:
High-end CNC Precision Spindles: Ultra-high-speed finishing machining centers, precision milling and boring machine spindles, mold high-precision processing spindles
Ultra-High-Speed Grinding Equipment: High-precision surface grinding spindles, internal and external grinding machine main shafts, ultra-fine grinding processing equipment
3C & Precision Micro-Processing Equipment: High-speed drilling, tapping and cutting spindles for consumer electronics, miniature ultra-precision finishing shafts
High-Precision Medical & Laboratory Equipment: Medical precision rotary instruments, laboratory high-speed testing spindles
Industrial Ultra-High-Speed Motor Spindles: Variable-frequency high-speed motor spindles requiring insulation and anti-electric corrosion performance, automated high-precision rotating shafts
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
Hangzhou Huaxing Kechuang Holding Group (HXB) Founded in May 1995, HXB (formerly Hangzhou Huaxing Bearing Co., Ltd.) is a leading national high-tech enterprise and a trusted manufacturer of high-precision, high-speed and low-noise ball bearings in China. With nearly 31 years of development, HXB has evolved into a comprehensive industrial group integrating R&D, production, sales and service, with a strong reputation for quality and innovation worldwide
HXB supports OEM/ODM customization based on customer drawings and requirements, providing high-quality products at competitive prices.
HXB is committed to becoming a world-class bearing solution provider, creating long-term value and win-win cooperation for global partners.
HXB provides more than 1,000 types of premium bearing solutions. Its core products include: deep groove ball bearings, angular contact ball bearings, high-precision spindle bearings, high-speed angular contact ball bearings, ball screw support bearings, low-noise motor bearings, hub bearings, NEV bearings, automotive bearings, textile machinery bearings, woodworking spindle bearings, servo motor bearings and agricultural bearings. HXB also supplies high-end CNC machine tool motorized spindles and key precision components.
HXB bearings are widely used in CNC machine tools, intelligent manufacturing, 3C, robotics, aerospace, new energy vehicles, servo motors, electric motors, home appliances, healthcare, textile machinery and precision machinery.
Certificates
Exhibition
FAQ
Q1: What are the key differences between these 7008C series open bearings and conventional sealed spindle bearings?
7008CEHC/GAP4A and 7008CDHC/GAP4A adopt a fully open structure without seals. Unlike sealed bearings that generate slight friction and heat limitation, open-type design eliminates sealing resistance, maximizes air circulation and lubricant penetration, and releases the ultimate ultra-high-speed performance. This structure is specially designed for professional oil-air and circulating oil lubrication systems, delivering lower temperature rise and more stable high-speed precision than sealed versions.
Q2: What is the advantage of GA universal pairing design?
The GA universal matching standard allows arbitrary pairing installation, including back-to-back, face-to-face and tandem arrangements. All single bearings maintain unified preload tolerance and consistent dimensional accuracy, requiring no strict pairing selection during assembly. It greatly simplifies spindle mounting processes, improves assembly flexibility, and guarantees balanced preload distribution and synchronous operating stability after multi-bearing combination.
Q3: What is the difference between 7008CEHC and 7008CDHC models?
The two models adopt different optimized contact angles for differentiated working conditions. The 7008CEHC focuses on ultra-low friction and extreme high-speed performance, ideal for pure high-speed, light-load finishing scenarios. The 7008CDHC balances high-speed capability and comprehensive radial & axial stiffness, suitable for medium-load high-precision milling and grinding tasks, providing wider working condition adaptability.
Q4: Can these P4S universal pairing bearings replace mainstream imported precision spindle bearings?
Yes. These two models adopt international standard 7008 dimension specifications, P4S ultra-precision manufacturing standards and universal GA pairing rules. They are fully interchangeable with mainstream imported open-type hybrid ceramic spindle bearings. With identical precision, speed performance and assembly compatibility, they serve as high-cost-effective replacement solutions for high-end spindle equipment.
Q5: What lubrication method is required for these open bearings?
Open-type structure is not applicable for single grease lubrication. It matches oil-air lubrication or circulating oil lubrication. Professional continuous lubrication can fully fill the bearing internal raceway, take away operating heat in real time, prevent dry friction, and maximize the ultra-high-speed stability and service life of P4S-grade precision bearings.
Q6: What working scenarios are not suitable for these open bearings?
Due to the open structure with no dustproof and waterproof protection, these bearings are not suitable for dusty, humid, splash polluted and poorly sealed workshop environments. They are only applicable for clean, standardized high-precision machining rooms with professional lubrication systems, avoiding particulate impurities entering the bearing and causing precision damage.
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