Series 248&249-Spherical Roller Bearings OEM/ODM


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Series 248&249-Spherical Roller Bearings

  • Design Variants
  • Tolerance
  • Internal clearance
Model Dimensions Rated load Extreme speed Calculation factor Weight
d D B r1,r2 min Dynamic load Static load Grease lubrication Oil lubrication e Y1 Y2 Yo [kg]
6 9780 31800 ­­ ­­ 0.15 4.5 6.7 4.5 1160
7.5 10700 36800 ­­ ­­ 0.15 4.5 6.7 4.5 1700
9.5 15400 55200 ­­ ­­ 0.15 4.5 6.7 4.5 2900
7.5 15200 43400 ­­ ­­ 0.2 3.4 5 3.2 2100
7.5 16100 46000 ­­ ­­ 0.21 3.2 4.8 3.2 2500
7.5 17900 53400 ­­ ­­ 0.21 3.2 4.8 3.2 2500
9.5 20700 59800 ­­ ­­ 0.2 3.4 5 3.2 3550

Ningbo DHK Precision Bearing Co., Ltd.

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    Years Experience Working

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    Customer Service

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    Patented Technology

Ningbo DHK Precision Bearing Co., Ltd. (“DHK” for short) is a specialist enterprise engaged in the R&D, manufacture and sales of bearings. Is a famous China Series 248&249-Spherical Roller Bearings Factory and OEM/ODM Series 248&249-Spherical Roller Bearings Company. And is located in Ningbo Zhenhai Economic Development Zone with convenient transportation. Since the establishment for over a decade, "technology", "quality" and "service" have always been the initial issues in our mind for the sake of development. We provide reliable products and special customized services for global enterprises in heavy industry and have got the Satisfaction and won good reputation of a number of enterprises at home and abroad.

DHK mainly produces cylindrical roller bearings, conical roller bearings, self-aligning roller bearings, ball bearings, as well as various kinds of non-standard bearings and bearings with specially treated surface. So far, DHK’s bearings have been widely applied in such fields as engineering machinery, industrial pump, machine tool, compression engine, gear case, wind power and metallurgy in developed European and American countries.

DHK has the measuring room and inspection room of bearings in the industry and has introduced top-end inspection equipment worldwide and established the QC system in China,thus guaranteeing product quality in an all-round way.


DHK has passed IATF16949 quality system certification and ISO14001 environmental management system certification;and DHK is a national high-tech enterprise.

  • Certificate
  • Environmental Managementsystem Certificate
  • Occupational Health And Safetymanagement System Certificate
  • Measurement Management System
  • Invention patent1
  • Invention patent2
  • Invention patent3
  • High-tech enterprises

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Industry Knowledge Expansion

1. Applications Across Industries of Series 248 & 249 Spherical Roller Bearings
Series 248 & 249 Spherical Roller Bearings serve as indispensable components in a multitude of industries, where their exceptional performance characteristics are leveraged to enhance the efficiency, reliability, and durability of various types of machinery and equipment. a)In the mining sector, where heavy-duty equipment operates under extreme conditions, these bearings play a vital role in crushers, screens, and conveyor systems. Their ability to withstand high radial and axial loads, coupled with their resistance to shock and vibration, ensures uninterrupted operation even in the harshest mining environments. Their robust construction and advanced sealing solutions make them well-suited for handling abrasive dust and contaminants commonly encountered in mining operations. b)In the construction industry, Series 248 & 249 bearings are utilized in equipment such as concrete mixers, pumps, and excavators. These bearings provide smooth and reliable rotational motion, contributing to the efficiency and productivity of construction machinery. Their ability to accommodate misalignment helps compensate for structural deflections and dynamic loads, ensuring optimal performance in diverse construction applications. c)In steel manufacturing plants, where heavy machinery operates at high speeds and temperatures, Series 248 & 249 Spherical Roller Bearings are employed in rolling mills, continuous casting machines, and furnace equipment. Their robust design and superior load-handling capabilities enable them to withstand the demanding conditions inherent in steel production processes. Their self-aligning properties help maintain alignment accuracy in machinery subjected to thermal expansion and contraction, minimizing downtime and maintenance costs.

2. Advantages Over Conventional Bearings
Series 248 & 249 Spherical Roller Bearings offer a myriad of advantages over conventional bearings, making them the preferred choice for demanding industrial applications where reliability, performance, and longevity are paramount. One of the primary advantages lies in their ability to accommodate misalignment. Unlike traditional ball bearings, which are sensitive to misalignment and require precise alignment for optimal performance, Series 248 & 249 bearings can tolerate misalignment to a certain degree. This capability reduces stress on machinery components, mitigates the risk of premature wear, and ensures smoother operation even in applications where shafts may be subject to deflection or vibration. Series 248 & 249 bearings boast superior load-carrying capacity compared to conventional bearings. Their robust design, optimized internal geometry, and larger contact area between the rollers and raceways enable them to handle significantly higher radial and axial loads. This enhanced load-carrying capability not only improves the performance of machinery but also extends the service life of bearings, resulting in reduced maintenance costs and downtime. Another key advantage is the self-aligning feature inherent in Series 248 & 249 bearings. This feature allows the bearings to automatically compensate for shaft misalignment, thermal expansion, and mounting errors, thereby minimizing the risk of bearing failure due to improper installation or operation. As a result, equipment operators can achieve greater flexibility in machine design and installation, while also benefiting from increased reliability and operational efficiency. Series 248 & 249 bearings are equipped with advanced sealing solutions that provide superior protection against contamination and moisture ingress. This ensures reliable operation even in harsh operating environments where dust, dirt, and moisture pose significant challenges. By effectively sealing out contaminants, these bearings help prevent premature wear, corrosion, and lubricant degradation, thereby extending maintenance intervals and reducing the likelihood of unplanned downtime.